甲骨文 SQL |合并-选择-更新子句 |目标表的子集

Question

我打算做什么？
为匹配的目标记录的子集更新一些目标表字段，在源和目标之间进行匹配，前提是它们都是同一个表。

哪里需要帮助？
Merge-into-target-using-select-source-on-子句似乎只控制两个类别-

• 当源记录和目标记录匹配时，更新所有匹配的目标记录
• 当源和目标记录不匹配时，插入或执行其他控制操作。

在我的情况下，当源记录和目标记录匹配时，我想对目标的不是所有记录执行更新，而是对目标记录的子集执行更新.

请求帮助以指导这一点。

这里的代码供参考（目标过滤限定符已注释，因为它肯定不会起作用）：

MERGE INTO TGT
USING (
SELECT id, account_number, part_role, inc_val, pay_frequency, 
period, pay_option, inclusion_value 
FROM Table_1
WHERE id = var1
AND account_number = var2
AND part_role in ('YY','XX')
) SRC
ON (
SRC.id = TGT.id
AND SRC.account_number = TGT.account_number
--TGT.part_role in ('AA','BB','CC','DD','EE') --This must be a wrong place for this qualifier, please help on where to include this qualifier for filtering out target records for update purpose
)
WHEN MATCHED THEN
UPDATE SET
TGT.inc_val = SRC.inc_val 
,TGT.pay_frequency = SRC.pay_frequency 
,TGT.period = SRC.period 
,TGT.pay_option = SRC.pay_option 
,TGT.inclusion_value = SRC.inclusion_value;

其他相关详情
数据库：甲骨文
版本：11gR2
环境：Unix

Answer 1

在SET 语句之后添加where 子句。

MERGE INTO TGT
USING (SELECT
  id,
  account_number,
  part_role,
  inc_val,
  pay_frequency,
  period,
  pay_option,
  inclusion_value
FROM Table_1
WHERE id = var1
AND account_number = var2
AND part_role IN ('YY', 'XX')) SRC
ON (
SRC.id = TGT.id
AND SRC.account_number = TGT.account_number
--TGT.part_role in ('AA','BB','CC','DD','EE') --This must be a wrong place for this qualifier, please help on where to include this qualifier for filtering out target records for update purpose
)
WHEN MATCHED THEN
UPDATE SET
TGT.inc_val = SRC.inc_val
, TGT.pay_frequency = SRC.pay_frequency
, TGT.period = SRC.period
, TGT.pay_option = SRC.pay_option
, TGT.inclusion_value = SRC.inclusion_value
WHERE TGT.part_role in ('AA','BB','CC','DD','EE');