[Term Entry] SQL Operators: UPDATE

* Add sql update entry

* Update update.md

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Author: PragatiVerma18

content/sql/concepts/operators/terms/update/update.md

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+---
+Title: 'UPDATE'
+Description: 'Modifies existing records in a table according to specified conditions.'
+Subjects:
+  - 'Data Science'
+  - 'Computer Science'
+Tags:
+  - 'Database'
+  - 'Queries'
+  - 'PostgreSQL'
+  - 'MySQL'
+CatalogContent:
+  - 'learn-sql'
+  - 'paths/analyze-data-with-sql'
+---
+
+The **`UPDATE`** statement in SQL is used to modify existing records in a table. This powerful **Data Manipulation Language (DML)** command allows developers to update one or multiple rows simultaneously.
+
+## Syntax
+
+```pseudo
+UPDATE table_name
+SET column1 = value1, column2 = value2, ...
+WHERE condition;
+```
+
+- `table_name`: The name of the table containing the data to be updated.
+- `SET`: Specifies the columns to update and their new values.
+- `condition`: An optional clause that specifies which rows to update. If omitted, all rows in the table are updated.
+
+## Example
+
+Let's say there's a table `Employees`:
+
+| ID  | Name  | Department | Salary |
+| --- | ----- | ---------- | ------ |
+| 1   | John  | HR         | 50000  |
+| 2   | Alice | IT         | 60000  |
+| 3   | Bob   | Sales      | 45000  |
+
+To update Bob's salary in the Sales department, the following query can be used:
+
+```sql
+UPDATE Employees
+SET Salary = 47000
+WHERE Name = 'Bob' AND Department = 'Sales';
+```
+
+Now, the updated table will be as follows:
+
+| ID  | Name  | Department | Salary |
+| --- | ----- | ---------- | ------ |
+| 1   | John  | HR         | 50000  |
+| 2   | Alice | IT         | 60000  |
+| 3   | Bob   | Sales      | 47000  |