Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I know maybe this is a stupid question, But i suck at sql
But what field type should you have on a field that can only have numbers 1 to 5? 5 is max and 1 is min.
It’s currently int(11) not unsigned
I heard having the wrong type can hurt performace
Edit: the database is InnoDB. RDBMS is MySQL
Depending on your RDBMS, go with an integer that can hold a small value.
MySQL has a
tinyintdatatype, which is of size 1 byte, and holds values 0-255 or -128 through 127.MySQL apparently doesn’t have check constraints implemented in the current version, so you’ll either have to enforce your 1-5 range requirement yourself in other code. There are some suggestions on writing a trigger to enforce this business logic.
You’re correct on the datatype-hurting-performance, but in this case, it’s unlikely to apply. Consider this a micro-optimization, but still worth considering.