https://www.w3schools.com/SQL/func_mysql_ifnull.asp
MySQL IFNULL() Function
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https://knowledge.broadcom.com/external/article/369451/ifnull-function-with-single-quote-in-tdm.html
IfNull function with single quote in TDM Portal
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https://bugs.mysql.com/bug.php?id=114972
MySQL Bugs: #114972: I got a bug with function about ifnull()
i gota bugmysqlbugs
https://www.w3schools.com/MySQL/mysql_ifnull.asp
MySQL IFNULL() and COALESCE() Functions
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mysqlcoalescefunctions