Question

这个查询完全适用于MySQL，但我应该重写使用MSSQL，这不起作用

SELECT DISTINCT TOP 20 [UF].[id], [UF].[created], [Company].[name]
FROM [user_functions] AS [UF] 
LEFT JOIN [companies] AS [Company] ON ([Company].[code] = [UF].[company_code]) 
WHERE [UF].[user_id] = 8923 AND [UF].[state] != 500 
ORDER BY [UF].[created] DESC

此查询返回重复的行，即使我设置了DISTINCT。

但是，当从[Company].[name]移除SELECT时，它会正确返回我想使用[Company]和[UF]表中的许多字段。

Answer 1

您可以尝试使用row_number并获取第一个rownum，如下所示：

select * from 
(
    SELECT DISTINCT TOP 20 [UF].[id], [UF].[created], [Company].[name],
    RowNum = row_number() over(partition by [Company].[name] order by [UF].[ID])
    FROM [user_functions] AS [UF] 
    LEFT JOIN [companies] AS [Company] ON ([Company].[code] = [UF].[company_code]) 
    WHERE [UF].[user_id] = 8923 AND [UF].[state] != 500 
) a where RowNum = 1
order by a.Created Desc

再次MSSQL DISTINCT

1 个答案: