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Add a column to a MySQL table which is the result of concatenation of text and value from another auto increment column?
For this, you can use LAST_INSERT_ID(). Let us first create a table −
mysql> create table DemoTable ( UserId int(6) unsigned zerofill NOT NULL AUTO_INCREMENT, UserAutoIncrement char(100) default null, PRIMARY KEY(UserId) ); Query OK, 0 rows affected (0.72 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(); Query OK, 1 row affected (0.13 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+--------+-------------------+ | UserId | UserAutoIncrement | +--------+-------------------+ | 000001 | NULL | +--------+-------------------+ 1 row in set (0.00 sec)
Following is the query to add a column to a MySQL table which is the result of concatenation −
mysql> update DemoTable set UserAutoIncrement=CONCAT('USER-', UserId) WHERE UserId = LAST_INSERT_ID();
Query OK, 1 row affected (0.20 sec)
Rows matched: 1 Changed: 1 Warnings: 0Let us check the table records once again −
mysql> select *from DemoTable;
Output
+--------+-------------------+ | UserId | UserAutoIncrement | +--------+-------------------+ | 000001 | USER-000001 | +--------+-------------------+ 1 row in set (0.00 sec)
Updated on: 20-Aug-2019
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