带有连接语句的 DB2 更新查询

Question

我正在尝试更新 D_WINTEL_HEALTH table 以下是我正在使用的查询

UPDATE  D_WINTEL_HEALTH A
SET A.HEALTH = 7
FROM D_WINTEL_HEALTH A JOIN D_REPORTER_STATUS B ON A.HOST = B.HOST 
WHERE B.ALERTKEY = 'kph_netport_xlzc_ilo' AND 
B.SEVERITY = 0 AND 
A.HEALTH <> 0

我还尝试了另一个查询：

UPDATE D_WINTEL_HEALTH A SET A.HEALTH = 7
FROM (Select D_WINTEL_HEALTH A JOIN D_REPORTER_STATUS B 
ON lower(A.HOST) = lower(B.HOST)) s
WHERE s.ALERTKEY = 'kph_netport_xlzc_ilo' AND s.SEVERITY = 0 AND s.HEALTH <> 0

但是他们俩return都在下面的错误：

[UPDATE - 0 row(s), 0.000 secs] [Error Code: -104, SQL State: 42601] DB2 SQL Error: SQLCODE=-104, SQLSTATE=42601, SQLERRMC=FROM;A SET A.HEALTH = 7 ;LEFT_BRACKET, DRIVER=4.15.82

测试了工作正常的 select 查询，不确定是什么问题，在 IBM DB2 中是否不同。

Answer 1

试试下面的查询。

 merge into AD_WINTEL_HEALTH A
   using (select SEVERITY, ALERTKEY from D_REPORTER_STATUS) b
    ON A.HOST = B.HOST
when matched and B.ALERTKEY = 'kph_netport_xlzc_ilo'  and B.SEVERITY = 0 and A.HEALTH <> 0 
   then update SET A.HEALTH = 7

Answer 2

改用 MERGE 语句。

MERGE INTO D_WINTEL_HEALTH A
USING D_REPORTER_STATUS B ON A.HOST = B.HOST 
AND B.ALERTKEY = 'kph_netport_xlzc_ilo' 
AND B.SEVERITY = 0 AND A.HEALTH <> 0 
WHEN MATCHED THEN UPDATE SET HEALTH = 7;

带有连接语句的 DB2 更新查询

DB2 update query with join statement

sql

db2

db2-luw