聯合查詢更新表數據

Sql Server

UPDATE a SET WtNo=b.NO
from WT_Task a
INNER JOIN WT_BasicInformation b ON a.WtId=b.ID;

或者

update a set a.ProjectID=b.ProjectID from
[ICTR_Project_NoticeSubkey] a,[iCTR_Project_Projects] b 
where a.ParentProjectID=b.ParentProjectID
and a.zt=2

My Sql

# update select 語句(注意:必須使用inner join)
# 語法 update a inner join (select yy from b) c on a.id =c.id set a.xx = c.yy
#SELECT knowledge_id,COUNT(0) nums FROM pro_base_timu_knowledge GROUP BY knowledge_id;
UPDATE pro_base_knowledge
INNER JOIN (
SELECT
knowledge_id,
COUNT(0) nums
FROM
pro_base_timu_knowledge
GROUP BY
knowledge_id
) b ON pro_base_knowledge.id = b.knowledge_id
SET pro_base_knowledge.timu_num = b.nums