Inserting random numbers into a table in MySQL?

To insert random numbers, use RAND() function from MySQL. Let us first create a table −

mysql> create table DemoTable (    Value int ); Query OK, 0 rows affected (0.46 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.08 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+ | Value | +-------+ | 10 | | 20 | | 30 | +-------+ 3 rows in set (0.00 sec)

Let us insert random numbers into a table in MySQL −

mysql> update DemoTable set Value=FLOOR(@number * rand()) + 1; Query OK, 3 rows affected (0.17 sec) Rows matched: 3 Changed: 3 Warnings: 0

Let us check table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-------+ | Value | +-------+ | 2 | | 2 | | 1 | +-------+ 3 rows in set (0.00 sec)