Question

我希望能够使用varable表从两个不同的表中删除记录。

到目前为止我有这个

declare @deleted TABLE (Card int)

insert into @deleted
select Card from table1
where recordstatus = 4

delete from table2
from @deleted d
where table2.actionstring like d.card
and Select convert(varchar(8),today,112)
from(Select dateadd(year,-1,getdate())as today)aa

抱歉，如果这令人困惑，我使用的是sql管理2005 我基本上希望能够从表1中获取卡号，检查表2中的日期是否大于一年，如果是，则删除表1中的记录。

在表2中，我没有卡号的字段，所以我需要一个LIKE语句。

我在第二部分中只有一个错误，其中包含：来自@deleted d

提前谢谢

Answer 1

你的陈述的第二部分确实令人困惑....你在WHERE子句中混合DELETE和SELECT .....你想在这里实现什么？？

declare @deleted TABLE (Card int)

insert into @deleted
  select Card from table1
  where recordstatus = 4

delete table2
from @deleted d
where table2.actionstring LIKE '%' + CAST(d.card AS VARCHAR(20)) + '%'
and CONVERT(DATETIME, table2.Date, 112) <= DATEADD(YEAR, -1, GETDATE())

delete table1
from @deleted d
where table1.card = d.card
and CONVERT(DATETIME, table1.Date, 112) <= DATEADD(YEAR, -1, GETDATE())

您是否尝试删除table2中Table2.ActionString等于Card表中@deleted列的所有行？不太清楚。

另外：日期约束是什么？ table2中的哪个字段要检查？条件是什么 - <=或>=或什么？

Answer 2

DELETE table1
FROM table1 INNER JOIN 
     table2 ON table1.card = table2.actionstring
WHERE table1.recordstatus = 4 AND
      table2.SomeDateColumn >= DATEADD(year, -1, GETDATE())

Answer 3

尝试类似：

delete t1
from
   table1 t1
   join table2 t2
      on t2.actionstring like t1.card + '%'
      and [... other criteria ...]

Answer 4

table2没有密钥的事实使事情变得复杂。特别是在这种情况下，我无法看到如何避免在table2中重复搜索。

无论如何，这里是：

DECLARE @deleted TABLE (card int);

/* store cards that are actually going to be deleted */
INSERT INTO @deleted (card)
SELECT DISTINCT t1.card
FROM table1 t1
  INNER JOIN table2 t2 ON t2.Date <= DATEADD(year, -1, GETDATE())
    AND t2.actionstring LIKE '%' + RIGHT(100000000 + t1.card, 8) + '%'
WHERE t1.recordstatus = 4

/* delete the history for the selected cards */
DELETE FROM t2
FROM @deleted t1
  INNER JOIN table2 t2 ON t2.Date <= DATEADD(year, -1, GETDATE())
    AND t2.actionstring LIKE '%' + RIGHT(100000000 + t1.card, 8) + '%'

/* delete the cards from table1 */
DELETE FROM table1
FROM @deleted d
WHERE table1.card = d.card
  AND table1.recordstatus = 4  /* not sure if this condition is needed again
                                  but it will certainly do no harm */

从SQL中的变量表中删除两个表

4 个答案: