diff --git a/bd/.gitignore b/bd/.gitignore
new file mode 100644
index 0000000..c2065bc
--- /dev/null
+++ b/bd/.gitignore
@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/bd/build.gradle b/bd/build.gradle
new file mode 100644
index 0000000..e511d05
--- /dev/null
+++ b/bd/build.gradle
@@ -0,0 +1,42 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.3.1'
+	id 'io.spring.dependency-management' version '1.1.5'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(17)
+	}
+}
+
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'org.springframework.boot:spring-boot-starter-jdbc'
+	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	compileOnly 'org.projectlombok:lombok'
+	developmentOnly 'org.springframework.boot:spring-boot-devtools'
+	runtimeOnly 'com.h2database:h2'
+	annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
+	annotationProcessor 'org.projectlombok:lombok'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}
diff --git a/bd/gradle/wrapper/gradle-wrapper.jar b/bd/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e644113
Binary files /dev/null and b/bd/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/bd/gradle/wrapper/gradle-wrapper.properties b/bd/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..a441313
--- /dev/null
+++ b/bd/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/bd/gradlew b/bd/gradlew
new file mode 100644
index 0000000..b740cf1
--- /dev/null
+++ b/bd/gradlew
@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/bd/gradlew.bat b/bd/gradlew.bat
new file mode 100644
index 0000000..25da30d
--- /dev/null
+++ b/bd/gradlew.bat
@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/bd/settings.gradle b/bd/settings.gradle
new file mode 100644
index 0000000..8e594a0
--- /dev/null
+++ b/bd/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'bd'
diff --git a/bd/src/main/java/com/example/bd/BdApplication.java b/bd/src/main/java/com/example/bd/BdApplication.java
new file mode 100644
index 0000000..d8d301c
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/BdApplication.java
@@ -0,0 +1,13 @@
+package com.example.bd;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BdApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BdApplication.class, args);
+	}
+
+}
diff --git a/bd/src/main/java/com/example/bd/Controller/CourseController.java b/bd/src/main/java/com/example/bd/Controller/CourseController.java
new file mode 100644
index 0000000..c4a6d8e
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Controller/CourseController.java
@@ -0,0 +1,38 @@
+package com.example.bd.Controller;
+
+import com.example.bd.Entity.Course;
+import com.example.bd.Repository.CourseRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/courses")
+public class CourseController {
+
+    @Autowired
+    private CourseRepository courseRepository;
+
+    // 과목 추가 (POST 요청 처리)
+    @PostMapping("/add")
+    public String addCourse(@RequestBody Course course) {
+        courseRepository.save(course);
+        return "Course added successfully";
+    }
+
+    // 과목 조회 (GET 요청 처리)
+    @GetMapping("/{id}")
+    public Course getCourseById(@PathVariable Long id) {
+        return courseRepository.findById(id)
+                .orElseThrow(() -> new RuntimeException("Course not found with id: " + id));
+    }
+
+    // 과목 삭제 (DELETE 요청 처리)
+    @DeleteMapping("/delete/{id}")
+    public String deleteCourse(@PathVariable Long id) {
+        Course course = courseRepository.findById(id)
+                .orElseThrow(() -> new RuntimeException("Course not found with id: " + id));
+
+        courseRepository.delete(course);
+        return "Course deleted successfully";
+    }
+}
\ No newline at end of file
diff --git a/bd/src/main/java/com/example/bd/Controller/EnrollmentController.java b/bd/src/main/java/com/example/bd/Controller/EnrollmentController.java
new file mode 100644
index 0000000..a112e0e
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Controller/EnrollmentController.java
@@ -0,0 +1,96 @@
+package com.example.bd.Controller;
+
+import com.example.bd.Entity.Enrollment;
+import com.example.bd.Entity.Student;
+import com.example.bd.Entity.Course;
+import com.example.bd.Repository.EnrollmentRepository;
+import com.example.bd.Repository.StudentRepository;
+import com.example.bd.Repository.CourseRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.time.LocalDate;
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/enrollments")
+public class EnrollmentController {
+
+    @Autowired
+    private EnrollmentRepository enrollmentRepository;
+
+    @Autowired
+    private StudentRepository studentRepository;
+
+    @Autowired
+    private CourseRepository courseRepository;
+
+    // 특정 학생의 수강 과목 추가 (POST 요청 처리)
+    @PostMapping("/add")
+    public String addEnrollment(@RequestBody EnrollmentRequest enrollmentRequest) {
+        // 학생과 과목을 데이터베이스에서 찾음
+        Student student = studentRepository.findById(enrollmentRequest.getStudentId())
+                .orElseThrow(() -> new RuntimeException("Student not found with id: " + enrollmentRequest.getStudentId()));
+        Course course = courseRepository.findById(enrollmentRequest.getCourseId())
+                .orElseThrow(() -> new RuntimeException("Course not found with id: " + enrollmentRequest.getCourseId()));
+
+        // Enrollment 객체 생성 및 설정
+        Enrollment enrollment = new Enrollment();
+        enrollment.setStudent(student);
+        enrollment.setCourse(course);
+        enrollment.setEnrollmentDate(enrollmentRequest.getEnrollmentDate());
+
+        // Enrollment 저장
+        enrollmentRepository.save(enrollment);
+
+        return "Enrollment added successfully";
+    }
+
+    // DTO 클래스 정의
+    public static class EnrollmentRequest {
+        private Long studentId;
+        private Long courseId;
+        private LocalDate enrollmentDate;
+
+        // getters and setters
+        public Long getStudentId() {
+            return studentId;
+        }
+
+        public void setStudentId(Long studentId) {
+            this.studentId = studentId;
+        }
+
+        public Long getCourseId() {
+            return courseId;
+        }
+
+        public void setCourseId(Long courseId) {
+            this.courseId = courseId;
+        }
+
+        public LocalDate getEnrollmentDate() {
+            return enrollmentDate;
+        }
+
+        public void setEnrollmentDate(LocalDate enrollmentDate) {
+            this.enrollmentDate = enrollmentDate;
+        }
+    }
+
+    // 특정 학생의 수강 과목 조회 (GET 요청 처리)
+    @GetMapping("/student/{studentId}")
+    public List<Enrollment> getEnrollmentsByStudentId(@PathVariable Long studentId) {
+        return enrollmentRepository.findByStudentStudentId(studentId);
+    }
+
+    // 특정 학생의 수강 과목 삭제 (DELETE 요청 처리)
+    @DeleteMapping("/delete/{enrollmentId}")
+    public String deleteEnrollment(@PathVariable Long enrollmentId) {
+        Enrollment enrollment = enrollmentRepository.findById(enrollmentId)
+                .orElseThrow(() -> new RuntimeException("Enrollment not found with id: " + enrollmentId));
+
+        enrollmentRepository.delete(enrollment);
+        return "Enrollment deleted successfully";
+    }
+}
\ No newline at end of file
diff --git a/bd/src/main/java/com/example/bd/Controller/StudentController.java b/bd/src/main/java/com/example/bd/Controller/StudentController.java
new file mode 100644
index 0000000..9c26513
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Controller/StudentController.java
@@ -0,0 +1,39 @@
+package com.example.bd.Controller;
+
+import com.example.bd.Entity.Student;
+import com.example.bd.Repository.StudentRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+
+@RestController
+@RequestMapping("/api/students")
+public class StudentController {
+
+    @Autowired
+    private StudentRepository studentRepository;
+
+    // 학생 추가 (POST 요청 처리)
+    @PostMapping("/add")
+    public String addStudent(@RequestBody Student student) {
+        studentRepository.save(student);
+        return "Student added successfully";
+    }
+
+    // 학생 조회 (GET 요청 처리)
+    @GetMapping("/{id}")
+    public Student getStudentById(@PathVariable Long id) {
+        return studentRepository.findById(id)
+                .orElseThrow(() -> new RuntimeException("Student not found with id: " + id));
+    }
+
+    // 학생 삭제 (DELETE 요청 처리)
+    @DeleteMapping("/delete/{id}")
+    public String deleteStudent(@PathVariable Long id) {
+        Student student = studentRepository.findById(id)
+                .orElseThrow(() -> new RuntimeException("Student not found with id: " + id));
+
+        studentRepository.delete(student);
+        return "Student deleted successfully";
+    }
+}
\ No newline at end of file
diff --git a/bd/src/main/java/com/example/bd/Entity/Course.java b/bd/src/main/java/com/example/bd/Entity/Course.java
new file mode 100644
index 0000000..fa6afe7
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Entity/Course.java
@@ -0,0 +1,63 @@
+package com.example.bd.Entity;
+import jakarta.persistence.*;
+import java.util.Set;
+
+@Entity
+@Table(name = "course")
+public class Course {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "course_id")
+    private Long courseId;
+
+    @Column(name = "course_name")
+    private String courseName;
+
+    private String instructor;
+
+    private Long score;
+
+    // 외래키 설정
+    @OneToMany(mappedBy = "course")
+    private Set<Enrollment> enrollments;
+
+    public Long getCourseId() {
+        return courseId;
+    }
+
+    public void setCourseId(Long courseId) {
+        this.courseId = courseId;
+    }
+
+    public String getCourseName() {
+        return courseName;
+    }
+
+    public void setCourseName(String courseName) {
+        this.courseName = courseName;
+    }
+
+    public String getInstructor() {
+        return instructor;
+    }
+
+    public void setInstructor(String instructor) {
+        this.instructor = instructor;
+    }
+
+    public Long getScore() {
+        return score;
+    }
+
+    public void setScore(Long score) {
+        this.score = score;
+    }
+
+    public Set<Enrollment> getEnrollments() {
+        return enrollments;
+    }
+
+    public void setEnrollments(Set<Enrollment> enrollments) {
+        this.enrollments = enrollments;
+    }
+}
diff --git a/bd/src/main/java/com/example/bd/Entity/Enrollment.java b/bd/src/main/java/com/example/bd/Entity/Enrollment.java
new file mode 100644
index 0000000..95c1f5f
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Entity/Enrollment.java
@@ -0,0 +1,55 @@
+package com.example.bd.Entity;
+import jakarta.persistence.*;
+
+import java.time.LocalDate;
+
+@Entity
+public class Enrollment {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "enrollment_id")
+    private Long enrollmentId;
+
+    @ManyToOne
+    @JoinColumn(name = "student_id", nullable = false)
+    private Student student;
+
+    @ManyToOne
+    @JoinColumn(name = "course_id", nullable = false)
+    private Course course;
+
+    @Column(name = "enrollment_date")
+    private LocalDate enrollmentDate;
+
+    public Long getEnrollmentId() {
+        return enrollmentId;
+    }
+
+    public void setEnrollmentId(Long enrollmentId) {
+        this.enrollmentId = enrollmentId;
+    }
+
+    public Student getStudent() {
+        return student;
+    }
+
+    public void setStudent(Student student) {
+        this.student = student;
+    }
+
+    public Course getCourse() {
+        return course;
+    }
+
+    public void setCourse(Course course) {
+        this.course = course;
+    }
+
+    public LocalDate getEnrollmentDate() {
+        return enrollmentDate;
+    }
+
+    public void setEnrollmentDate(LocalDate enrollmentDate) {
+        this.enrollmentDate = enrollmentDate;
+    }
+}
diff --git a/bd/src/main/java/com/example/bd/Entity/Student.java b/bd/src/main/java/com/example/bd/Entity/Student.java
new file mode 100644
index 0000000..a3b6188
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Entity/Student.java
@@ -0,0 +1,70 @@
+package com.example.bd.Entity;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import jakarta.persistence.*;
+
+import java.time.LocalDate;
+import java.util.Set;
+
+@Entity
+@Table(name = "student")
+public class Student {
+
+    @Id // primary key
+    // GeneratedValue : Auto Increment, 자동으로 1씩 증가
+    // strategy : 고유 번호를 생성하는 옵션
+    // GenerationType.IDENTITY : 독립적인 시퀀스를 생성, 기본 키 생성을 위한 설정
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "student_id")
+    private Long studentId;
+
+    private String name;
+
+    @Column(name = "birth_date")
+    private LocalDate birthDate;
+
+    private String email;
+
+    @OneToMany(mappedBy = "student")
+    @JsonIgnore
+    private Set<Enrollment> enrollments;
+
+    public Long getStudentId() {
+        return studentId;
+    }
+
+    public void setStudentId(Long studentId) {
+        this.studentId = studentId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public LocalDate getBirthDate() {
+        return birthDate;
+    }
+
+    public void setBirthDate(LocalDate birthDate) {
+        this.birthDate = birthDate;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public Set<Enrollment> getEnrollments() {
+        return enrollments;
+    }
+
+    public void setEnrollments(Set<Enrollment> enrollments) {
+        this.enrollments = enrollments;
+    }
+}
diff --git a/bd/src/main/java/com/example/bd/Repository/CourseRepository.java b/bd/src/main/java/com/example/bd/Repository/CourseRepository.java
new file mode 100644
index 0000000..31856cd
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Repository/CourseRepository.java
@@ -0,0 +1,6 @@
+package com.example.bd.Repository;
+import com.example.bd.Entity.Course;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CourseRepository extends JpaRepository<Course, Long> {
+}
\ No newline at end of file
diff --git a/bd/src/main/java/com/example/bd/Repository/EnrollmentRepository.java b/bd/src/main/java/com/example/bd/Repository/EnrollmentRepository.java
new file mode 100644
index 0000000..56a4f15
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Repository/EnrollmentRepository.java
@@ -0,0 +1,14 @@
+package com.example.bd.Repository;
+import com.example.bd.Entity.Enrollment;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.List;
+
+public interface EnrollmentRepository extends JpaRepository<Enrollment, Long> {
+
+    // 특정 학생의 모든 수강 과목을 조회하는 쿼리 메서드
+    @Query("SELECT e FROM Enrollment e WHERE e.student.id = :studentId")
+    List<Enrollment> findByStudentStudentId(Long studentId);
+    List<Enrollment> findByCourseCourseId(Long courseId);
+}
\ No newline at end of file
diff --git a/bd/src/main/java/com/example/bd/Repository/StudentRepository.java b/bd/src/main/java/com/example/bd/Repository/StudentRepository.java
new file mode 100644
index 0000000..a8c2886
--- /dev/null
+++ b/bd/src/main/java/com/example/bd/Repository/StudentRepository.java
@@ -0,0 +1,6 @@
+package com.example.bd.Repository;
+import com.example.bd.Entity.Student;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface StudentRepository extends JpaRepository<Student, Long> {
+}
diff --git a/bd/src/main/resources/application.properties b/bd/src/main/resources/application.properties
new file mode 100644
index 0000000..44d706c
--- /dev/null
+++ b/bd/src/main/resources/application.properties
@@ -0,0 +1,20 @@
+spring.application.name=bd
+
+server.port=8080
+
+spring.datasource.driver-class-name=org.h2.Driver
+spring.datasource.url=jdbc:h2:~/test
+spring.datasource.username=sa
+spring.datasource.password=
+spring.datasource.platform=h2
+spring.datasource.initialization-mode=always
+
+# H2
+spring.h2.console.enabled=true
+spring.h2.console.path=/h2-console
+
+# JPA
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=create
+spring.jpa.show-sql=true
+spring.jpa.prope
\ No newline at end of file
diff --git a/bd/src/test/java/com/example/bd/BdApplicationTests.java b/bd/src/test/java/com/example/bd/BdApplicationTests.java
new file mode 100644
index 0000000..5270e0b
--- /dev/null
+++ b/bd/src/test/java/com/example/bd/BdApplicationTests.java
@@ -0,0 +1,13 @@
+package com.example.bd;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BdApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}