Row_number syntax error (WordPress)

Solution:

Consider using a conditional count aggregate subquery to return a row number. Below assigns an increasing row number by last name:

SELECT 
     (SELECT Count(*) 
     FROM barbara_players t2 
     WHERE t1.last_name >= t2.last_name) AS player_num, 
     CONCAT(t1.name,' ', t1.last_name) AS player_name, 
     t1.date_of_birth, t1.phone, t1.email 
FROM barbara_players t1
ORDER BY t1.last_name ASC