Question

i am creating a table. and i am using some update queries on it.

this table has placeId, noOfGirls, noOfBoys. due to some update queries the values of these two fields noOfGirls and noOfBoys becomes negative.

Is there a way so i can convert these negative values to 0. means any constrains or something else so i can protect to be value negative.

Thank you in advance.

Answer 1

Declare the column as unsigned int type.

The unsigned range is 0 to 4294967295, so the value never become negative.

You can alter the schema of your existing table

alter table table_name modify column noOfGirls int(10) unsigned;

You can read it more here