如何解决如何使用内部联接更新行
我有一条选择语句,在其中找到两行,我想更新特定的列:
select * from murex.STPDLV_ENTRY_TABLE a
inner join (select DLV_FLOW_XX,max(TS_TIME_LONG) AS MaxDateTime from murex.STPDLV_ENTRY_TABLE group by DLV_FLOW_XX) b
on a.DLV_FLOW_XX = b.DLV_FLOW_XX
and a.TS_TIME_LONG=b.MaxDateTime
and a.DLV_FLOW_XX in (3741539,4044126,3741551)
and a.STP_UDF9 !='Posted';
我尝试过:
update STPDLV_ENTRY_TABLE a
set a.STP_UDF9 = 'Posted'
where
inner join (select DLV_FLOW_XX,3741551);
如何正确构造更新查询?
解决方案:
update (select *
from STPDLV_ENTRY_TABLE a
inner join (select DLV_FLOW_XX,max(TS_TIME_LONG) AS MaxDateTime
from STPDLV_ENTRY_TABLE
group by DLV_FLOW_XX) b
on a.DLV_FLOW_XX = b.DLV_FLOW_XX
and a.TS_TIME_LONG = b.MaxDateTime
and a.DLV_FLOW_XX in (3741539,3741551)
and a.STP_UDF9 !='Posted') test
set test.STP_UDF9 = 'Posted';
解决方法
对我来说,merge
似乎是一个更好/更简单的选择。
MERGE INTO stpdlv_entry_table a
USING ( SELECT dlv_flow_xx,MAX (ts_time_long) AS maxdatetime
FROM murex.stpdlv_entry_table
GROUP BY dlv_flow_xx) b
ON ( a.dlv_flow_xx = b.dlv_flow_xx
AND a.ts_time_long = b.maxdatetime)
WHEN MATCHED
THEN
UPDATE SET a.stp_udf9 = 'Posted'
WHERE a.dlv_flow_xx IN (3741539,4044126,3741551);
,
只需将查询作为表格放置
update (select *
from STPDLV_ENTRY_TABLE a
inner join (select DLV_FLOW_XX,max(TS_TIME_LONG) AS MaxDateTime
from STPDLV_ENTRY_TABLE
group by DLV_FLOW_XX) b
on a.DLV_FLOW_XX = b.DLV_FLOW_XX
and a.TS_TIME_LONG = b.MaxDateTime
and a.DLV_FLOW_XX in (3741539,3741551)
and a.STP_UDF9 !='Posted') test
set test.STP_UDF9 = 'Posted';
这是一个演示:
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