select * from "StudentMaster" where "PhoneNo" = NULL;
语法错误！
我想查看所有没有电话号码的记录！
我已经尝试了这一切。
select * from "StudentMaster" where "PhoneNo" NOT LIKE ('%');
select * from "StudentMaster" where "PhoneNo" NOT IN ('%');
但它显示了所有有电话号码但不为空的记录！为什么
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