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我查詢這裏:怎樣獲得MySQL變量放到Where子句
select *,@final := DATE_ADD(start_date, INTERVAL 2 YEAR) AS final_date from emp_employee as emp
where employee_type_id=2
and (end_date is null or end_date>now());
但是,當我改變我的查詢到這一點:
select *,@final := DATE_ADD(start_date, INTERVAL 2 YEAR) AS final_date from emp_employee as emp
where employee_type_id=2
and YEAR(@final)=2016
and (end_date is null or end_date>now());
它沒有給出任何結果,它是空的。我的查詢出了什麼問題以及如何解決?
非常感謝!它工作很大 –