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How to update MySQL column with random value?
To update column with random value, you can use the below syntax−
update yourTableName set yourColumnName =round(1+rand()*100);
The above syntax will generate a value between 1 to 100. Let us see an example and create a table−
mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.46 sec)
Insert records in the table using insert command −
mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(100000); Query OK, 1 row affected (0.39 sec) mysql> insert into DemoTable values(987); Query OK, 1 row affected (0.16 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output−
+--------+ | Number | +--------+ | 10 | | 100 | | 80 | | 100000 | | 987 | +--------+ 5 rows in set (0.00 sec)
Following is the query to update column with random value−
mysql> update DemoTable set Number=round(1+rand()*100); Query OK, 5 rows affected (0.46 sec) Rows matched: 5 Changed: 5 Warnings: 0
Let us display table records once again−
mysql> select *from DemoTable;
This will produce the following output −
+--------+ | Number | +--------+ | 33 | | 88 | | 41 | | 39 | | 70 | +--------+ 5 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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