mysql - 当计数大于零时选择真

Question

我有以下查询。

SELECT COUNT( * ) AS offer_count
  FROM restaurants_offers
WHERE DATE( NOW( ) ) 
   BETWEEN date_start
   AND date_end
AND restaurant_id =1

现在，当 count 大于零时，我想选择 true else false，而不是 count 作为查询结果。如何做到这一点？

Answer 1

试试这个:

SELECT IF(COUNT(*) > 0, 'true', 'false') AS NewResult
  FROM restaurants_offers
 WHERE (DATE(NOW())  BETWEEN date_start AND date_end) AND 
       restaurant_id = 1