这可能是由于where子句中的lessor而不是lessor_name引起的.因此，请尝试以下方法:

It might be due to lessor instead of lessor_name in where clause. So try with below once :

SELECT CONCAT_WS(" ", strLname, strFname, strMname) AS lessor_name 
FROM tbl_lessor 
having lessor_name= '$lessor_name'