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How to create a temporary MySQL table in a SELECT statement without a separate CREATE TABLE?
To create a temporary table in a SELECT statement we use TEMPORARY keyword.
This temporary table will be visible for the current session and whenever a session is closed, it is automatically destroyed. Two sessions can use the same temporary table.
Creating a table.
mysql> create table MyTableDemo -> ( -> id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.69 sec)
Inserting some records.
mysql> insert into MyTableDemo values(1,'John'); Query OK, 1 row affected (0.18 sec) mysql> insert into MyTableDemo values(2,'Carol'); Query OK, 1 row affected (0.13 sec) mysql> insert into MyTableDemo values(3,'Bob'); Query OK, 1 row affected (0.12 sec)
To display all records.
mysql> select *from MyTemporaryTableDemo;
Here is the output.
+------+-------+ | id | Name | +------+-------+ | 1 | John | | 2 | Carol | | 3 | Bob | +------+-------+ 3 rows in set (0.00 sec)
The syntax to create a temporary table.
CREATE TEMPORARY TABLE IF NOT EXISTS yourTemporaryTableName AS (SELECT * FROM yourTableName);
Let us now implement the above syntax in the following query −
mysql> CREATE TEMPORARY TABLE IF NOT EXISTS MyTemporaryTableDemo AS (SELECT * FROM MyTableDemo); Query OK, 3 rows affected (0.01 sec) Records: 3 Duplicates: 0 Warnings: 0
To check if all records are copied successfully.
mysql> select *from MyTemporaryTableDemo;
Here is the output.
+------+-------+ | id | Name | +------+-------+ | 1 | John | | 2 | Carol | | 3 | Bob | +------+-------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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