轉換成查詢使用EXISTS

Question

我編寫一個查詢來找到一些記錄...

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); 

數據表 - 第一個查詢的

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 

輸出---

4579214598412 223344 null S 

我想在更新語句中使用此查詢使用存在如

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); 

我要標示爲完成列= P在LOAD_MOBILE_DATA情形之一mob_tele_feat爲null，並且mob_tele_feat_uid不爲空或mob_tele_feat_uid爲空，但mob_tele_feat不爲空

Answer 1

你過度設計的。如果該查詢返回正確的記錄：

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); 

然後簡單地改變這樣的：

select account_num, mob_tele_feat_uid, mob_tele_feat, done 
from LOAD_MOBILE_DATA lmd1 

這樣：

update load_mobile_data 
set done = 'P' 

Answer 2

使用此CTE更新 請修改加盟條件爲每你匹配的列

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

最簡單的方法是...只是更新你的查詢。

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' 

---

如果你真的想使用EXISTS操作，那麼你需要使用唯一標識表中的每一行中的主鍵列：

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) 
      ) 
)