SQL如果日期比較

Question

選擇true如果日期少於特定時間，是否可以將布爾值作爲選擇字段返回？

例如，像：

SELECT true IF (mydate < NOW()) 

或類似的東西？

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語句下面你可以簡單地注入內聯：

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