SQL-至少排除一次满足要求的列的值

在

ON

这意味着该

ON

Stock

Client

SELECt [Client].[IDC]FROM [Client]      LEFT JOIN [Stock]          on [Client].[IDC] = [Stock].[IDC]   AND [Stock].[Type] = 1    AND [Stock].[Price] IS NOT NULLWHERe [Stock].[IDC] IS NULL

这也可以使用

NOT EXISTS

SELECt [Client].[IDC]FROM [Client] cWHERe NOT EXISTS(    SELECt 1    FROM [Stock] s    WHERe c.[IDC] = s.IDC   AND s.[Type] = 1    AND s.[Price] IS NOT NULL)