Question

我的查询返回以下结果，每当我看到COLUMN4值的值为“YES”时，我需要为COLUMN1组下的所有记录设置“YES”值。例如，DAVID有2条记录，NO和YES-但我的目标状态对所有行都应为“YES”，因为对于至少一条记录，它的值为“YES”。

查询结果

Column1  Column2 Column3 Column4
=================================
Mary     AA      AAA     YES
Mary     BB      BBB     YES
David    AA      AAA     YES
David    BB      BBB     NO
Clara    AA      AAA     NO
Clara    BB      BBB     NO

请求的目标国家

Column1     Column2       Column3      Column4
================================================
Mary        AA            AAA          YES
Mary        BB            BBB          YES
David       AA            AAA          YES
David       BB            BBB          **YES**
Clara       AA            AAA          NO
Clara       BB            BBB          NO

Answer 1

UPDATE my_table m set m.column4='YES' 
WHERE m.column4='NO'
AND exists(
select 1 from my_table mm where mm.column1= m.column1 and mm.column4 = 'YES')

Answer 2

由于评论：

UPDATE my_table m1 set m.column4='YES' 
WHERE m1.column4='NO'
AND m1.column1  IN (
select m2.column1 from my_table m2 where mm.column4 = 'YES')

Answer 3

这是您想要的Select语句，

111.111.111.111  www.yourdomain.com

结果：

SELECT mt.Column1,mt.Column2,mt.Column3,
(CASE WHEN mt2.cc IS NULL THEN 'NO' ELSE 'YES' END) AS Column4 
FROM mytable mt LEFT JOIN 
(SELECT Column1,COUNT(*) AS cc FROM mytable WHERE Column4 = 'YES' GROUP BY Column1)
AS mt2 ON mt2.Column1 = mt.Column1

如何使用在任何行

3 个答案: