如何结合这两个凭证查询？

Question

I wanted to make this two queries into one query. The purpose of the query is to check if the credentials match in either of the table "user_credentials" or "workers". How can I do so?

SELECT user_name FROM user_credentials WHERE user_name = '$user_email' AND password = '$user_password'

SELECT user_name FROM workers WHERE user_name = '$user_email' AND password = '$user_password'

Answer 1

try this

SELECT user_name FROM user_credentials WHERE user_name = '$user_email' AND password = '$user_password'

union

SELECT user_name FROM workers WHERE user_name = '$user_email' AND password = '$user_password'

then check mysqli_num_rows or mysql_num_rows