獲得上個月的所有記錄在SQL Server中對於當月

Question

我有兩個表payment_tbl和bill_tbl具有以下屬性

payment_tbl (payment_ID int -> pk) 
bill_tbl (payment_ID int -> Fk 
     ,bill_IssueDate date 
     ,bill_status varchar 
     ,bill_amount type int 
     ) 

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所以，如果我想知道哪些payment_ID有賬單狀態「沒有付款「，現在的月份是2017年2月我想知道在2017年1月沒有支付賬單。

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我嘗試下面的查詢，但它返回我空列名

SELECT p.payment_ID 
     ,b.amount_To_Pay 
FROM bill_tbl AS b 
    INNER JOIN payment_tbl AS p 
     ON b.payment_id = p.payment_ID 
WHERE b.bill_status = 'Not Paid' 
    AND b.bill_IssueDate >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0) 
    AND b.bill_IssueDate < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) + 0, 0) 

Answer 1

你需要看第一當前和以前的兩個月，你的範圍設置爲。 AS

select 
    p.payment_ID, 
    b.amount_To_Pay 
FROM 
    bill_tbl AS b 
    INNER JOIN payment_tbl AS p ON 
    b.payment_id = p.payment_ID 
WHERE 
    (b.bill_status = 'Not Paid') 
    and b.bill_IssueDate < DATEADD(month, DATEDIFF(month, 0, getdate()), 0) 
    and b.bill_IssueDate >= DATEADD(month, DATEDIFF(month, 0, dateadd(month,-1,getdate())), 0) 

Answer 2

應儘可能簡單 -

SELECT p.payment_ID 
    ,b.amount_To_Pay 
FROM bill_tbl AS b 
INNER JOIN payment_tbl AS p 
    ON b.payment_id = p.payment_ID 
WHERE b.bill_status = 'Not Paid' 
AND DATEDIFF(month, b.bill_IssueDate ,getdate()) = 1 

你還有別的錯誤，日期範圍是確定的，去掉一些在WHERE子句中，看看是否有其實是爲那些任何數據個月 - 我不認爲這是你的日期範圍