從表中刪除不匹配的數據

Question

我有一張表和同一張表的備份。備份後在主表中插入一些數據。現在我想從主表中刪除數據。如何實現它？ 讓說表是帶有AuthorID，BookName，BookID列的'BookMap'。取得'BookMap'表的備份並插入新數據。現在要刪除這些數據。

注意：我在這裏沒有主鍵。

Answer 1

如果你想BookMap看起來就像backup_BookMap，那麼你可以考慮：

truncate table bookmap; 

insert into bookmap(. . .) 
    select . . . 
    from backup_bookmap; 

Answer 2

如果我理解正確的，你想從你非備份表中刪除數據，有被插入到備份表：

DELETE nonbackup 
FROM BookMap as nonbackup 
WHERE nonbackup.BookID IN 
(
    SELECT BookID 
    FROM BookMapBackup as backup 
) 

Answer 3

嘗試這樣，

DELETE B FROM bookmark B INNER JOIN 
(
SELECT *FROM (
select *From bookmark 
except 
select *From bookmarkbackup)T 
)T1 ON T1.AuthorID=B.AuthorID 
AND T1.BookName=B.BookName 
AND T1.BookID=B.BookID 

Answer 4

下面是一些你可以測試：

DECLARE @book table 
(
    AuthorID varchar, 
    BookName varchar(255), 
    BookID int 
); 

DECLARE @backupBook table 
(
    AuthorID varchar, 
    BookName varchar(255), 
    BookID int 
); 

insert into @book values(1, 'book1', 1) 
insert into @book values(2, 'book2', 2) 
insert into @book values(3, 'book3', 3) 

insert into @backupBook values(1, 'book1', 1) 
insert into @backupBook values(2, 'book2', 2) 

select * from @book 
select * from @backupBook 

delete a 
from @book a 
INNER JOIN @backupBook b 
    ON a.AuthorID = b.AuthorID 
    and a.BookName = b.BookName 
    and a.BookID = b.BookID 

select * from @book 
select * from @backupBook