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Understanding the Difference Between DELETE and TRUNCATE Commands in T-SQL

DELETE and TRUNCATE are both commands used in T-SQL to remove data from a table, but they have some key differences:

• DELETE: DELETE is a DML (Data Manipulation Language) command that removes specific rows from a table based on a condition specified in the WHERE clause. It is slower than TRUNCATE as it logs each individual row deletion and can be rolled back.
• TRUNCATE: TRUNCATE is a DDL (Data Definition Language) command that removes all rows from a table without logging individual row deletions. It is faster than DELETE as it only logs the deallocation of data pages, but cannot be rolled back.

In summary, DELETE is used for selective row removal with the ability to roll back changes, while TRUNCATE is used for quickly removing all rows from a table without the option to rollback.

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