Alex Stetsenko

A temporary table could be very useful in some cases to keep temporary data.

There are couple interesting things about temporary tables.

1) A temporary table is visible only to the current connection, and is dropped automatically when the connection is closed.This means that two different connections can use the same temporary table name without conflicting with each other.

2) There is a short way to create a temporary table filled with data:

CREATE TEMPORARY TABLE MyTemporaryTable
SELECT ID, `Name` FROM MyRealTable WHERE ID < 10;

instead of more traditional way like:

CREATE TEMPORARY TABLE MyTemporaryTable
(
  ID INT,
  `Name` VARCHAR(100)
);
 
INSERT INTO MyTemporaryTable (ID, `Name`)
SELECT ID, `Name` FROM MyRealTable WHERE ID < 10;