Difference between Truncate and Delete

Difference between Truncate and Delete


Delete:
1)Rollback  operation can be performed  on delete queries
2)"where"clause can be used on delete queries

Truncate:
1)Rollback  operation can not be performed  on Truncate queries
2)"where" clause can not  be used on Truncate queries

And most imported  point about Truncate is truncate drops the table structure and recreates the table structure .

For example we  may have a identity coulmn which is autoincremented  (say empid),when  there are 100 records in table
1)when we delete all the 100 records  using "delete"  query ,it deletes all the records but when we try to insert the new record the  autoincremented value(empid) will be 101.
2) For the same scenario if we use truncate query to delete all 100  records.When we try to insert to insert new record the autoincremented value(empid) will be 1.