SQL如果日期比较

Question

选择true如果日期少于特定时间，是否可以将布尔值作为选择字段返回？

例如，像：

SELECT true IF (mydate < NOW()) 

或类似的东西？

Answer 1

SELECT 
    CAST(CASE WHEN mydate< getdate() THEN 1 ELSE 0 END AS bit) AS mydate 
FROM 
    MyTable WHERE (ID = 1) 


-- Another approach might be 

SELECT 
    CAST(COUNT(*) AS bit) AS mydate 
FROM 
    MyTable 
WHERE 
    ID = 1 AND mydate < getdate() 

Answer 2

IF语句下面你可以简单地注入内联：

SELECT CAST(IIF(mydate < GETDATE(), 1, 0) AS BIT)