truncate table sql code example

Example 1: query to empty table data in sql server

TRUNCATE TABLE  table_name;

Example 2: sql truncate table

-- Quick, no possible rollback
TRUNCATE TABLE my_table;
-- With rollback
DELETE FROM my_table;
COMMIT;

Example 3: truncate table

TRUNCATE TABLE table;

Example 4: what is truncate

DELETE -
-DML COMMAND
-Delete Rows from the table one by one
-We can use where clause with Delete to delete single row
-Delete is slower than truncate
-ROLLBACK is possible with DELETE

DROP-
-DDL COMMAND
-Delete the entire structure or schema
-We can't use where clause with drop
-Drop is slower than DELETE & TRUNCATE
-ROLLBACK IS NOT POSSIBLE WITH DROP

TRUNCATE-
-DDL COMMAND
-Truncate deletes rows at a one goal
-We can't use where clause with Truncate
-Truncate faster than both DELETE & DROP
-Rollback is not possible with Truncate

Example 5: sql truncate number

-- Truncate number with cast
UPDATE my_table
SET my_column = CAST(my_column AS INT)
WHERE ...;
-- or convert
UPDATE my_table
SET my_column = CONVERT(INT, my_column)
WHERE ...;