2

我有以下查询:

select      count(L.ID)
from        LA inner join L on (LA.leadid = L.ID)
where       L.status = 5
and         L.city = "cityname"
and         Date(LA.Datetime) < Date_Sub(Now(), INTERVAL 6 MONTH);

它会查找特定城市中状态为 5 且超过 6 个月的记录(该日期存储在 LA)。这将返回大约 4k 个结果。我想将每条记录的状态值更新为 1,因此我的更新如下所示:

update      L, LA
set         L.status = 1
where       L.status = 5 
and         L.city = "cityname" 
and         Date(LA.SomeDatetime) < Date_Sub(Now(), INTERVAL 6 MONTH);

但它会停止并锁定数据库。我怀疑有问题,因为没有加入,但我尝试类似:

update      L, LA
from        L inner join LA on (L.OID = LA.leadid)
set         L.status = 1
where       L.status = 5 
and         L.syscity = "cityname" 
and         Date(LA.SomeDatetime) < Date_Sub(Now(), INTERVAL 6 MONTH);

它显然不起作用,因为更新中没有“来自”。

编辑>我正在使用 MySQL

4

4 回答 4

7
update      L
set         L.status = 1
where       L.status = 5 
and         L.city = "cityname" 
and         EXISTS (
  select * from LA 
  where Date(LA.SomeDatetime) < Date_Sub(Now(), INTERVAL 6 MONTH)
  and LA.leadid = L.ID
)
于 2009-03-02T22:45:02.797 回答
3

对于MySQL,您可以使用旧的连接语法:

UPDATE  l, la
SET     l.status = 1
WHERE   l.status = 5
  AND   l.city = "cityname"
  AND   la.leadid = l.id
  AND   DATE(la.datetime) < DATE_SUB(NOW(), INTERVAL 6 MONTH)
于 2009-03-02T23:14:49.310 回答
1

我会这样做:

update L
set status = 1
from LA
where L.OID = LA.leadid
and L.status = 5
and L.syscity = "cityname"
and Date(LA.SomeDatetime) < Date_Sub(Now(), INTERVAL 6 MONTH)

也可以看看:

SQL 根据 ID 匹配从一个表更新到另一个表

于 2009-03-02T22:42:21.510 回答
1

在 SQL Server 2005 中,这将起作用:

Update L
   set L.status = 1
from
   L
   --
   JOIN LA
      on (LA.leadid = L.id)
where
   L.status = 5
   and L.city = "cityname"
   and Date(LA.Datetime) < Date_Sub(Now(), INTERVAL 6 MONTH);
于 2009-03-02T23:02:33.160 回答