SQL's Data Manipulation Language (DML) includes powerful commands such as INSERT, UPDATE, DELETE, and MERGE, which facilitate adding, modifying, and removing data within database tables. Using a sample Employees table, the article illustrates how to use these commands. INSERT allows for the addition of new employees, UPDATE lets users adjust salaries based on specific criteria, and DELETE removes employees from specific departments. Additionally, the MERGE command allows for either inserting or updating data based on existing conditions, optimizing data handling in SQL databases.
The INSERT command is essential for adding new data to tables, enabling the addition of employees like Frank with specific attributes into the Employees table.
UPDATE commands in SQL allow modifications to existing data. For example, giving a salary increase to all Developers in the IT department is accomplished with the right conditions.
DELETE commands efficiently remove unwanted data from tables, effectively allowing for the removal of employees from departments, such as deleting all in the QA department.
The MERGE statement, also known as 'upsert', provides a way to either insert a new record or update an existing one based on a condition, streamlining data management.
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