MYSQL - 可以根据条件命名结果的 SELECT 语句

Question

我想构造一个可以根据条件命名结果的 SELECT 语句。为了更好地解释我的尝试，我构建了以下无效/不起作用的语句。如何将以下 SELECT 语句更改为真正适合我的原因的语句。谢谢!

SELECT  
  CASE
     WHEN dayStart LIKE '2012-06-11%' THEN UNIX_TIMESTAMP(dayStart) as today
     WHEN dayStart LIKE '2012-06-10%' THEN UNIX_TIMESTAMP(dayStart) as yest
     WHEN dayStart LIKE '2012-06-12%' THEN UNIX_TIMESTAMP(dayStart) as tomor
  END
FROM dayBook
WHERE userID = 1

Answer 1

为什么不只返回两列，一列告诉您日期，另一列告诉您是今天、昨天还是明天？

SELECT  
  UNIX_TIMESTAMP(dayStart) as yourDate
, CASE
     WHEN dayStart LIKE '2012-06-11%' THEN 'today'
     WHEN dayStart LIKE '2012-06-10%' THEN 'yest'
     WHEN dayStart LIKE '2012-06-12%' THEN 'tomor'
  END as dayType
FROM dayBook
WHERE userID = 1