SQL encompasses a range of Data Manipulation Language (DML) commands that enable users to manage and manipulate data within databases. Commands such as INSERT, UPDATE, DELETE, and MERGE provide practical methods for adding new data, modifying existing data, and removing outdated entries in a structured database. For instance, the INSERT command facilitates the addition of new employee records, the UPDATE command can increase salaries based on specific roles, and the DELETE command can remove entire entries if required. The MERGE command streamlines processes by allowing users to either update or add new rows, enhancing efficiency in database management.
The INSERT command is used to add new rows to a table, allowing for the expansion of database records with precise details corresponding to each entry.
UPDATE modifies data in existing rows based on conditions, enabling adjustments to be made effectively, like salary increases for specific roles and departments.
The DELETE command allows for the removal of rows from a table, which is essential for maintaining database accuracy by eliminating unnecessary or outdated entries.
The MERGE statement, also known as 'upsert', combines insertion and updating operations, simplifying database management by handling both cases in a single command.
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