Postgresql 中的 SQL Server MERGE 語句？

Question

merge into Mytable WITH (HOLDLOCK) as dst
                    using (select @mId as MId,  
                        @up as UP, 
                        @termsAccepted as TermsAccepted, 
                        @AnalyticsAccepted as AnalyticsAccepted, 
                        @EssentialCookiesPolicyWasAccepted as EssentialAccepted,

                    ) as src on dst.MId = src.MId and dst.UP = src.UP
                when matched then 
                    update set dst.TermsAccepted = src.TermsAccepted,
                        dst.AnalyticsAccepted = src.AnalyticsAccepted,
                        dst.EssentialAccepted = src.EssentialAccepted,

                when not matched then
                    insert(MId, UP ) 
                    values(src.MId, src.UP)

試圖將其轉換為 postgres 但似乎無法找到合並的語法替換的原因？

嘗試了一個遞歸查詢，但對要走多深有點迷茫？

WITH f AS (
select mId as MId,  
up as UP, 
) as src on dst.MId = src.MId and dst.UP = src.UP
)
INSERT INTO myTable (MId, UP) 
SELECT src.MId, src.UP
FROM src
WHERE NOT EXISTS (
insert(MId, UP ) 
values(src.MId, src.UP)
                           

Answer 1

不確定 Microsoft SQL server 語句究竟做了什么，但您可以嘗試以下操作：

INSERT INTO mytable (mid, up) VALUES ($1, $2)
ON CONFLICT (mid, up)
DO UPDATE SET mid = EXCLUDED.mid, up = EXCLUDED.up;

這需要對(mid, up)的唯一約束。

您問題中UPDATE分支中的列具有不同的名稱，但這對我來說沒有任何意義。 根據需要更換細節！