查找和更新值

Question

我有兩個表;相冊和貸款。我有一個BorrowerId = RS96FM已經失去了內容的表貸款，因此我想更新相冊中的ShelfNumber爲0.但是，我不知道如何去做這件事，因爲我首先必須找到AlbumCode BorrowerId擁有的內容，然後更改ShelfNumber，無論他們在相冊中擁有哪個AlbumCode。

下面是我的sql語句目前看起來像到目前爲止。

Select AlbumCode, Performer, AlbumTitle, ShelfNumber, YearReleased, RecordCompanyCode 
from Albums 
where ShelfNumber =(Select ShelfNumber 
        from Albums 
        where AlbumCode = (Select AlbumCode 
             from Loans 
             where Borrowerid ='RS96FM' 
             **and update(Shelfnumber) = 0)) 

Answer 1

我猜子查詢會起作用。以下查詢格式適用於sql server。

Update Albums 
set ShelfNumber=0 
where AlbumCode in (Select AlbumCode 
        from Loans 
        where Borrowerid ='RS96FM') 

Answer 2

您需要使用UPDATE命令。 首先確定這是你的記錄。對於選擇第一：

select * from albums where shelfnumber in (
    select shelfNumber from albums where albumcode in (
    select albumcode from loans where borrowerid='RS96FM')) 

如果這是你的記錄，更新：

update albums set shelfnumber=0 where shelfnumber in (
    select shelfNumber from albums where albumcode in (
    select albumcode from loans where borrowerid='RS96FM'))