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问题描述
我只想更新 apr
,现在,无论是否不同,它看起来都在更新:
I'm looking to update apr
only if it's different, right now, it looks like it updates regardless if it's different or same:
INSERT INTO live_mytable (id, loan_type, apr, term, oldestyear)
SELECT id, loan_type, apr, term, oldestyear
FROM imp_mytable
ON CONFLICT (id,loan_type,term,oldestyear) DO update
set apr = excluded.apr;
如何将查询更改为仅在值不同时才更新?
How can this query be changed to only update if value is different?
推荐答案
您可以在更新中使用 WHERE
子句:
You can use a WHERE
clause on the update:
INSERT INTO live_mytable (id, loan_type, apr, term, oldestyear)
SELECT id, loan_type, apr, term, oldestyear
FROM imp_mytable
ON CONFLICT (id,loan_type,term,oldestyear)
DO update
set apr = excluded.apr
WHERE
live_mytable.apr IS DISTINCT FROM
EXCLUDED.apr;
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