What is difference between DELETE & TRUNCATE commands?

Answer

Delete command removes the rows from a table based on the condition that we provide

with a WHERE clause. Truncate will actually remove all the rows from a table and there will

be no data in the table after we run the truncate command.

TRUNCATE

TRUNCATE is faster and uses fewer system and transaction log resources than

DELETE.

TRUNCATE removes the data by deallocating the data pages used to store the table’s

data, and only the page deallocations are recorded in the transaction log.

TRUNCATE removes all rows from a table, but the table structure, its columns,

constraints, indexes and so on, remains. The counter used by an identity for new

rows is reset to the seed for the column.

You cannot use TRUNCATE TABLE on a table referenced by a FOREIGN KEY

constraint. Because TRUNCATE TABLE is not logged, it cannot activate a trigger.

TRUNCATE cannot be rolled back unless it is used in TRANSACTION.

TRUNCATE is DDL Command.

TRUNCATE Resets identity of the table

DELETE

DELETE removes rows one at a time and records an entry in the transaction log for

each deleted row.

If you want to retain the identity counter, use DELETE instead. If you want to remove

table definition and its data, use the DROP TABLE statement.

DELETE Can be used with or without a WHERE clause

DELETE Activates Triggers.

DELETE can be rolled back.

DELETE is DML Command.

DELETE does not reset identity of the table.

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