SQL 服务器 : Update table row using merge

Question

你好，我正在尝试从动态变量更新表，但我总是得到不正确的语法，你能帮我看看我哪里出错了吗？

这是我运行查询时的消息。

select convert(varchar(55),refdate)+'-'+convert(varchar(55),refcount) FROM [gen_048_MAR2016]

      MERGE gen_048_MAR2016 as target             USING #temp1 as source
          ON target.refcount = source.refnum
              AND sourc3e.tsql = target.refcount
        WHEN MATCHED THEN
          UPDATE
              SET
              target.stat = source.stat
              target.statdate = source.statdate           WHEN NOT MATCHED BY TARGET THEN
        INSERT (stat, statdate)
        VALUES (S.stat, S.statdate)                   
            ; Msg 102, Level 15, State 1, Line 10 Incorrect syntax near 'target'.

ERROR: Incorrect syntax near 'target'.

我没有写完整的查询，所以我只是复制并粘贴我认为我出错的部分。

CREATE TABLE #records(
         [index] int PRIMARY KEY IDENTITY
        ,refnum varchar(200)
        ,stat varchar(200)
        ,statdate varchar(200)
    )

insert into #records (refnum, stat, statdate) 
select 
dbo.fn_Parsename(WHOLEROW,'|',0),
dbo.fn_Parsename(WHOLEROW,'|',3),
dbo.fn_Parsename(WHOLEROW,'|',4)

from #temp1

declare @refnum varchar(100)
declare @stat varchar(100)
declare @statdate varchar(100)
declare @sql NVARCHAR(MAX),
declare @index int


WHILE (@index <= (SELECT MAX([index]) FROM #records))


    BEGIN

    set @stat = (select stat from #records where [index] = @index)
    select @stat
    set @statdate = (select statdate from #records where [index] = @index)
    select @statdate

    set @refnum = (select refnum from #records where [index] = @index)
    set @refnum = replace(@refnum, 'F', '')
    select @refnum

    set @sql = '
        MERGE '+@sourceTable+' T
        USING #temp1 S
            ON T.refcount = S.refnum
                AND S.tsql = T.refcount
        WHEN MATCHED THEN
            UPDATE
                SET 
                T.stat = S.stat
                T.statdate = S.statdate
        WHEN NOT MATCHED BY TARGET THEN
          INSERT (stat, statdate)
          VALUES (S.stat, S.statdate)                   
            ;'
            select @refnum, @stat, @statdate
            print @sql
            exec (@sql)

        SELECT 'File has been successfully uploaded', @fileDate,'success' as msg

      set @index = @index + 1

   END

我没有放置 @sourceTable 字符串来减少代码，但如果需要该信息，我可以随时添加它。

Answer 1

1. 在变量替换后的实际动态 SQL 中，您使用 target 和 source 保留字作为表别名。使用方括号 [target] 或更好的方法是像在“整个查询”代码示例中那样使用 T。
2. T.stat = S.stat 后动态 SQL 中缺少逗号。