Merge pull request #305 from Deepak-Vohra/main

SQL-449 How to Sum Two Columns in an SQL Query

Author: maibin

sql-queries-8/sum-two-columns-sql-query/create-nullable-table.sql

@@ -0,0 +1,14 @@
+CREATE TABLE magazine_nullable 
+(publisher_id INT NOT NULL, 
+magazine_name varchar(50), 
+q1sales INT,
+q2sales INT);
+
+INSERT INTO magazine_nullable
+(publisher_id,magazine_name,q1sales,q2sales)
+VALUES(1,'magazine_1',NULL,30),
+(1,'magazine_2',100,NULL),
+(2,'magazine_3',50,NULL),
+(2,'magazine_4',NULL,20),
+(3,'magazine_5',NULL,50),
+(3,'magazine_6',NULL,25);

sql-queries-8/sum-two-columns-sql-query/create-table.sql

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+CREATE TABLE magazine 
+(publisher_id INT NOT NULL, 
+magazine_name varchar(50), 
+q1sales INT NOT NULL,
+q2sales INT NOT NULL);
+
+INSERT INTO magazine
+(publisher_id,magazine_name,q1sales,q2sales)
+VALUES(1,'magazine_1',60,30),
+(1,'magazine_2',100,25),
+(2,'magazine_3',50,25),
+(2,'magazine_4',75,20),
+(3,'magazine_5',10,50),
+(3,'magazine_6',25,25);
+
+SELECT * FROM magazine;

sql-queries-8/sum-two-columns-sql-query/sum-columns-sep-sum-function.sql

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+SELECT
+publisher_id,magazine_name,
+SUM(q1sales) + SUM(q2sales) AS Q1Q2Sales
+FROM magazine
+GROUP BY publisher_id,magazine_name;

sql-queries-8/sum-two-columns-sql-query/sum-columns-together-sum-function.sql

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+SELECT  
+publisher_id, magazine_name,
+SUM(q1sales + q2sales) AS Q1_Q2_Sales
+FROM magazine
+GROUP BY publisher_id,magazine_name;

sql-queries-8/sum-two-columns-sql-query/sum-nullable-cols-using-sum-function.sql

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+SELECT 
+publisher_id, 
+SUM(q1sales) + SUM(q2sales) AS Q1Q2Sales
+FROM magazine_nullable WHERE publisher_id<3
+GROUP BY publisher_id;

sql-queries-8/sum-two-columns-sql-query/sum-two-nullable-cols-using-sum-function-as-window-function.sql

@@ -0,0 +1,8 @@
+SELECT  publisher_id,magazine_name,
+COALESCE(q1sales,0)+COALESCE(q2sales,0) AS magazine_sales,
+SUM(COALESCE(q1sales,0)+COALESCE(q2sales,0))
+    OVER(PARTITION BY publisher_id) AS publisher_sales,
+SUM(COALESCE(q1sales,0)+COALESCE(q2sales,0))
+    OVER() AS total_sales
+FROM magazine_nullable
+WINDOW w AS (PARTITION BY publisher_id ORDER BY publisher_id);

sql-queries-8/sum-two-columns-sql-query/sum-using-coalesce.sql

@@ -0,0 +1,5 @@
+SELECT
+publisher_id,magazine_name,
+SUM(COALESCE(q1sales,0)) + SUM(COALESCE(q2sales,0)) AS Q1Q2Sales
+FROM magazine_nullable
+GROUP BY publisher_id,magazine_name;

sql-queries-8/sum-two-columns-sql-query/sum-using-column-expression.sql

@@ -0,0 +1,4 @@
+SELECT  
+publisher_id, magazine_name,
+q1sales+q2sales AS magazine_sales 
+FROM magazine;

sql-queries-8/sum-two-columns-sql-query/sum-using-window-function.sql

@@ -0,0 +1,8 @@
+SELECT publisher_id, magazine_name,
+q1sales+q2sales AS magazine_sales, 
+SUM(q1sales+q2sales) 
+    OVER(PARTITION BY publisher_id) AS publisher_sales, 
+SUM(q1sales+q2sales) 
+    OVER() AS total_sales 
+FROM magazine 
+WINDOW w AS (PARTITION BY publisher_id ORDER BY publisher_id);