Diffrence Between delete and truncate
SQL> select * from T2;
I2
----------
1
2
SQL> we discuss the diffrence betwween delete and truncate;
SQL> delete from t2;
2 rows deleted.
SQL> select * from T2;
no rows selected
SQL> rollback
2 ;
Rollback complete.
SQL> select * from T2;
I2
----------
1
2
SQL> we delete the data from table,we can rollback,and the data deleted will back;
SQL>
SQL> select * from T2;
I2
----------
1
2
SQL> truncate table t2;
Table truncated.
SQL> select * from T2;
no rows selected
SQL> rollback;
Rollback complete.
SQL> select * from T2;
no rows selected
SQL> we truncate a table,the data will be found never!
SQL> delete is a DML ,but truncate is a DDL;
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