Question

我写了一个查询来查找一些记录......

select account_num, mob_tele_feat_uid, mob_tele_feat, done
from LOAD_MOBILE_DATA lmd1
where (mob_tele_feat is null and mob_tele_feat_uid is not null)
   or (mob_tele_feat is not null and mob_tele_feat_uid is null);

表格中的数据 -

4579214598412   223344  {sw_dcf=Gold}|{sw_dcf_active_voice_bsg=Silver}|{sw_cfb=bronze}|{sw_c=bronze}    S
4579214598412   223344                                                                                  S
     null       null    null                                                                            P

第一个查询的输出是---

4579214598412   223344  null    S

我想在更新语句中使用此查询，使用像

这样的存在

update load_mobile_data lmd
  set done = 'P'
where exists
  (select account_num, mob_tele_feat_uid, mob_tele_feat, done
   from LOAD_MOBILE_DATA lmd1
   where (mob_tele_feat is not null and mob_tele_feat_uid is null)
      or (mob_tele_feat is null and mob_tele_feat_uid is not null)
     and lmd.account_num = lmd1.account_num
     and lmd.mob_tele_feat = lmd.MOB_TELE_FEAT
     and lmd.MOB_TELE_FEAT_UID = lmd.MOB_TELE_FEAT_UID);

我想在LOAD_MOBILE_DATA中标记DONE列= P，其中mob_tele_feat为null且mob_tele_feat_uid不为null或者mob_tele_feat_uid为null但是mob_tele_feat不为null

Answer 1

你过度工作了。如果此查询返回正确的记录：

select account_num, mob_tele_feat_uid, mob_tele_feat, done
from LOAD_MOBILE_DATA lmd1
where (mob_tele_feat is null and mob_tele_feat_uid is not null)
   or (mob_tele_feat is not null and mob_tele_feat_uid is null);

然后只需更改：

select account_num, mob_tele_feat_uid, mob_tele_feat, done
from LOAD_MOBILE_DATA lmd1

到此：

update load_mobile_data
set done = 'P'

Answer 2

使用此CTE更新 请根据匹配列

修改加入条件

    WITH temptable AS
    (
        SELECT * FROM load_mobile_data WHERE 
        (mob_tele_feat is null and mob_tele_feat_uid is not null) 
        OR (mob_tele_feat is not null and mob_tele_feat_uid is null)
    )
    UPDATE a SET a.done='P' FROM load_mobile_data a JOIN temptable b 
    ON a.account_num=b.account_num

Answer 3

最简单的方法是......只需更新您的查询。

UPDATE (
    select *
    from LOAD_MOBILE_DATA lmd1
    where (mob_tele_feat is null and mob_tele_feat_uid is not null)
       or (mob_tele_feat is not null and mob_tele_feat_uid is null)
)
SET done = 'P'

如果您确实想使用EXISTS运算符，则需要使用唯一标识表中每一行的主键列：

UPDATE  LOAD_MOBILE_DATA lmd1
SET done = 'P'
WHERE EXISTS (
        select *
        from LOAD_MOBILE_DATA lmd2
        where 
           lmd1.id = lmd2.id
           AND
           (
             (mob_tele_feat is null and mob_tele_feat_uid is not null)
             or (mob_tele_feat is not null and mob_tele_feat_uid is null)
           )
)

将查询转换为使用EXISTS

3 个答案: