mysql - How to combine these two credentials Queries? -

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i wanted make 2 queries 1 query. purpose of query check if credentials match in either of table "user_credentials" or "workers". how can so?

select user_name user_credentials user_name = '$user_email' , password = '$user_password'

select user_name workers user_name = '$user_email' , password = '$user_password'

try 

select user_name user_credentials user_name = '$user_email' , password = '$user_password'  union  select user_name workers user_name = '$user_email' , password = '$user_password'

then check mysqli_num_rows or mysql_num_rows


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