将SQL server合并代码转换为等效的Postgresql代码

如何将SQL server的合并转换为等效的postgresql代码： 我是SQL Server新手，不知道合并的行为

merge PortfolioAssetClassBenchmark_Subset as t
 using @inputBenchmark as s
    on t.PortfolioId = @PortfolioId and t.StartDate = s.F_STARTDATE
 when matched and isnull(s.F_BENCHMARK, 0) != 0 and t.AssetClassBenchmarkId != s.F_BENCHMARK then
    update set 
    t.AssetClassBenchmarkId = s.F_BENCHMARK
 when matched and isnull(s.F_BENCHMARK, 0) = 0 then
    delete  
 when not matched by target and isnull(s.F_BENCHMARK, 0) != 0 then
    insert (PortfolioId, StartDate, AssetClassBenchmarkId)
    values (@PortfolioId, s.F_STARTDATE, s.F_BENCHMARK) 
 when not matched by source and @clearExisting != 0 then
    delete
 output  inserted.AssetClassBenchmarkId [InsertedAssetClassBenchmarkId]
    , inserted.StartDate [InsertedStartDate]
    , deleted.AssetClassBenchmarkId [DeletedAssetClassBenchmarkId]
    , deleted.StartDate [DeletedStartDate] 
 into @tmp

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欢迎来到SO。到目前为止你试过什么？请检查我正在使用Postgresql 12，此版本不再支持合并。我知道的唯一替代方法是插入conflict@swapnilsolanki . . . 示例数据、所需结果和逻辑解释将有所帮助。@GordonLinoff我只想知道在postgresql中复制相同数据时可能使用的语法