Shulou(Shulou.com)06/01 Report--

1.MDL (data manipulation language, data manipulation language): used to query, insert, delete and modify data in the database.

Such as select (query), insert (insert), update (modify), delete (delete), truncate (delete).

2.DDL (date definition language, data definition language): used to build databases, database objects and define their columns, mostly commands that start with create, such as create (create), alter (modify), drop (terminate).

3.DCL (date control language, data control language): used to control database components of the storage license, storage permissions, etc., such as grant (grant permissions), revoke (recall, recall permissions), deny (deny permissions).

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