126.96.36.199 CREATE TEMPORARY TABLE Statement
You can use the
TEMPORARY keyword when creating a table. A
TEMPORARY table is visible only within the current session, and is dropped automatically when the session is closed. This means that two different sessions can use the same temporary table name without conflicting with each other or with an existing non-
TEMPORARY table of the same name. (The existing table is hidden until the temporary table is dropped.)
CREATE TABLE causes an implicit commit, except when used with the
TEMPORARY keyword. See Section 13.3.3, “Statements That Cause an Implicit Commit”.
TEMPORARY tables have a very loose relationship with databases (schemas). Dropping a database does not automatically drop any
TEMPORARY tables created within that database. Also, you can create a
TEMPORARY table in a nonexistent database if you qualify the table name with the database name in the
CREATE TABLE statement. In this case, all subsequent references to the table must be qualified with the database name.
To create a temporary table, you must have the
CREATE TEMPORARY TABLES privilege. After a session has created a temporary table, the server performs no further privilege checks on the table. The creating session can perform any operation on the table, such as
One implication of this behavior is that a session can manipulate its temporary tables even if the current user has no privilege to create them. Suppose that the current user does not have the
CREATE TEMPORARY TABLES privilege but is able to execute a definer-context stored procedure that executes with the privileges of a user who does have
CREATE TEMPORARY TABLES and that creates a temporary table. While the procedure executes, the session uses the privileges of the defining user. After the procedure returns, the effective privileges revert to those of the current user, which can still see the temporary table and perform any operation on it.
TABLESPACE = innodb_file_per_table and
TABLESPACE = innodb_temporary clauses with
CREATE TEMPORARY TABLE is deprecated as of MySQL 5.7.24 and will be removed in a future version of MySQL.