PL\SQL DML instruction
Is Commit a DML instruction in PL\SQ开发者_如何学CL?
No, it's a transaction control (TCL) statement, not a data manipulation (DML) statement. Here is a list of SQL statement types.
No COMMIT is not a DML instruction. It comes under TCL. COMMIT is used to save the changes made by using DML instructions. In general COMMIT is used with ROLLBACK.
DML: Data manipulation language (DML) statements access and manipulate data in existing schema objects. These statements do not implicitly commit the current transaction.
CALL
DELETE
EXPLAIN
PLAN
INSERT
LOCK
TABLE
MERGE
SELECT
UPDATE
The SELECT statement is a limited form of DML statement in that it can only access data in the database. It cannot manipulate data in the database, although it can operate on the accessed data before returning the results of the query. The CALL and EXPLAIN PLAN statements are supported in PL/SQL only when executed dynamically. All other DML statements are fully supported in PL/SQL
TCL: Transaction control statements manage changes made by DML statements
COMMIT
ROLLBACK
SAVEPOINT
SET TRANSACTION
精彩评论