Set all values in a MySQL field to 0?

To set all the values in a field to 0, use the update command −

update yourTableName set yourColumnName=0;

Let us first create a table −

mysql> create table DemoTable
   (
   Number int
   );
Query OK, 0 rows affected (0.64 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(4757);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values(48474);
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable values(35465);
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+--------+
| Number |
+--------+
| 10     |
| 4757   |
| 48474  |
| 35465  |
+--------+
4 rows in set (0.00 sec)

Following is the query to set all values in a MySQL field to 0 −

mysql> update DemoTable set Number=0;
Query OK, 4 rows affected (0.17 sec)
Rows matched: 4 Changed: 4 Warnings: 0

Let us check table records once again −

mysql> select *from DemoTable;

Output

+--------+
| Number |
+--------+
| 0      |
| 0      |
| 0      |
| 0      |
+--------+
4 rows in set (0.00 sec)