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This means that if you kill DELETE [LOW_PRIORITY | QUICK] FROM table_name [WHERE where_definition] [ORDER BY ...] [LIMIT rows] or DELETE [LOW_PRIORITY | QUICK] table_name[.*] [,table_name[.*] ...] FROM table-references [WHERE where_definition] or DELETE [LOW_PRIORITY | QUICK] FROM table_name[.*], [table_name[.*] ...] USING table-references [WHERE where_definition] clause will return zero as the number of affected records.If you really want to know how many records are deleted when you are deleting all rows, and are willing to suffer a speed penalty, you can use a is faster. The first multi-table delete format is supported starting from My SQL 4.0.0.
The new query must generate the same columns that were generated by the existing view query (that is, the same column names in the same order and with the same data types), but it may add additional columns to the end of the list.Simulating Materialized View Materialized views are not updated every time they are accessed; they behave as static tables hence are much faster than normal view.Materialized views are useful when the system performs lots of queries on the view while the original data changes infrequently.Then you create the following My SQL command that can be run periodically, for example every night.
CREATE VIEW my_view AS SELECT In order to create the equivalent to a materialized view you create a table with the same name instead of a view.
A simple workaround for My SQL's limitation on local variables usage in views is to use a function, which returns variable's value:create function book_subjectreturns varchar(64) asreturn @book_subject;create view thematical_books asselect title , author from books where subject = book_subject(); I ran into the restriction where your view cannot contain a subquery in the FROM clause.