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Select and insert values with preceding zeros in a MySQL table
For this, you can use INSERT INTO SELECT statement along with LPAD(). Let us first create a table −
mysql> create table DemoTable1967 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserId varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1967(UserId) select LPAD(COALESCE(MAX(id), 0) + 1, 3, '0') from DemoTable1967; Query OK, 1 row affected (0.00 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> insert into DemoTable1967(UserId) select LPAD(COALESCE(MAX(id), 0) + 1, 3, '0') from DemoTable1967; Query OK, 1 row affected (0.00 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> insert into DemoTable1967(UserId) select LPAD(COALESCE(MAX(id), 0) + 1, 3, '0') from DemoTable1967; Query OK, 1 row affected (0.00 sec) Records: 1 Duplicates: 0 Warnings: 0
Display all records from the table using select statement −
mysql> select * from DemoTable1967;
This will produce the following output −
+----+--------+ | Id | UserId | +----+--------+ | 1 | 001 | | 2 | 002 | | 3 | 003 | +----+--------+ 3 rows in set (0.00 sec)
Updated on: 31-Dec-2019
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