Source code editor What Is Ajax
Source code editor What Is Ajax
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Views (including updatable views) are implemented in MySQL Server 5.0. Views are available in binary releases from 5.0.1 and up.
Answers to some frequently asked questions concerning views in MySQL 5.0 can be found in Section A.6, “MySQL 5.0 FAQ — Views”.
This chapter discusses the following topics:
Creating or altering views with CREATE VIEW or ALTER VIEW
Destroying views with DROP VIEW
Discussion of restrictions on use of views is given in Section F.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 5.5.8, “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 a view, which must exist. The syntax is similar to that for CREATE VIEW and the effect is the same as for CREATE OR REPLACE 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”.