sql - Why am I getting "Ambiguous column name" in this query? -


i have following query:

$sql = "select * employee emp left join tr_bls_date bls on emp.employee_id=bls.employee_id , employee_id='".$id."'";

basically, both emp , bls tables have common employee_id field. looking employee via employee's id ($id). doing wrong here?

because there 2 tables contains employee_id , server confused search. fix problem, add source table, eg.

on emp.employee_id = bls.employee_id ,     emp.employee_id = ?      // search on table employee

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