php - Check whether MySQL record exists based on 2 parameters -

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i'm creating php system needs check whether record exists.

i'm fine checking whether record exist matches single column:

mysql_query("select * articles s_id = '$myvar'")

however, want see whether there exact match 2 columns in database (a_id , s_id), while ignoring match of 3rd column.

any ideas on how check match on 2 parameters exist?

thanks taking - feel free ask clarifications.

mysql_query("select * articles s_id = '$myvar' , a_id= '$myvar2'")

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