Documentation for the ALTER VIEW statement, which is used to modify an existing view's definition without dropping and recreating it.
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 if the view exists. This statement
requires the CREATE VIEW and DROP for the view, and some
privilege for each column referred to in the SELECT statement. ALTER VIEW is allowed only to the definer or users with the privilege.
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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]ALTER VIEW v AS SELECT a, a*3 AS a2 FROM t;