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How to update records in a column with random numbers in MySQL?
Let us first create a table −
mysql> create table DemoTable746 ( Number int ); Query OK, 0 rows affected (0.56 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable746 values(100); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable746 values(200); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable746 values(300); Query OK, 1 row affected (0.31 sec) mysql> insert into DemoTable746 values(400); Query OK, 1 row affected (0.20 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable746;
This will produce the following output -
+--------+ | Number | +--------+ | 100 | | 200 | | 300 | | 400 | +--------+ 4 rows in set (0.00 sec)
Following is the query to update records with random number:
mysql> update DemoTable746 set Number=CAST(RAND() * 10000 AS UNSIGNED); Query OK, 4 rows affected (0.13 sec) Rows matched: 4 Changed: 4 Warnings: 0
Let us check table records once again −
mysql> select *from DemoTable746;
This will produce the following output -
+--------+ | Number | +--------+ | 4422 | | 1350 | | 3485 | | 3371 | +--------+ 4 rows in set (0.00 sec)
Updated on: 03-Jul-2020
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