Table of Contents
Views (including updatable views) are implemented in MySQL Server 5.0. Views are available in binary releases from 5.0.1 and up.
This chapter discusses the following topics:
-
Creating or altering views with
CREATE VIEWorALTER VIEW -
Destroying views with
DROP VIEW
Discussion of restrictions on use of views is given in Section I.4, “Restrictions on Views”.
To use views if you have upgraded to MySQL 5.0.1 from an older release, you should upgrade your grant tables so that they contain the view-related privileges. See Section 5.6.2, “mysql_upgrade — Check Tables for MySQL Upgrade”.
Metadata about views can be obtained from the
INFORMATION_SCHEMA.VIEWS table and by using the
SHOW CREATE VIEW statement. See
Section 20.15, “The INFORMATION_SCHEMA VIEWS Table”, and
Section 13.5.4.7, “SHOW CREATE VIEW Syntax”.
ALTER
[ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}]
[DEFINER = { user | CURRENT_USER }]
[SQL SECURITY { DEFINER | INVOKER }]
VIEW view_name [(column_list)]
AS select_statement
[WITH [CASCADED | LOCAL] CHECK OPTION]
This statement changes the definition of an existing view. The
syntax is similar to that for CREATE VIEW. See
Section 19.2, “CREATE VIEW Syntax”. This statement requires the
CREATE VIEW and DROP
privileges for the view, and some privilege for each column
referred to in the SELECT statement.
This statement was added in MySQL 5.0.1. The
DEFINER and SQL SECURITY
clauses may be used as of MySQL 5.0.16 to specify the security
context to be used when checking access privileges at view
invocation time. For details, see Section 19.2, “CREATE VIEW Syntax”.