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我一直在做一个小项目，可以这么说，其中包括大量的代码改造。我对旧的 sql 连接符号有基本的了解，其中大部分是我从 stackoverflow 中获得的，但是我注意到周围的很多结构与我所熟悉的非常不同。就将其转换为现代 SQL 代码而言，我基本上对设置类似于此的代码感到困惑。我想让这与其他人相关，但我认为大多数软件会在几年前更新。任何建议将不胜感激。

If @SelectLevel = '' Or @SelectLevel = 'B'
Select @SQLCmd =
    'SELECT Stop_Number, ''B'' AS Inv_Type, Inv_Desc, ' +
        'Box_Number AS Item_Number, BOX.Company_ID, BOX.Department_ID, BOX.Group_Id, BOX.Section_Id, ' +
        'BOX.Media_Code, BOX.Location_Current, BOX.Location_Home, BOX.Hold_Status, BOX.Record_Type, ' +
        'BOX.Alternate_Id, BOX.Description1, BOX.Retention_Code, BOX.Retention_type, BOX.Retention_Disposal, ' + 
        'BOX.Description2, BOX.Description3, ' + 
        'Reservation_Status, BOX.Disposition_Status ' +
    'FROM BOX, DISPOSITION_MEMO, (SELECT Item_Type, Item_Number, MAX(Reservation_Process_Status) AS ' +
    'Reservation_Status FROM RESERVATION GROUP BY Item_Type, Item_Number) AS RESV, ' +
    '(SELECT Ele_Text AS Inv_Desc, Ele_Usr_Text AS Inv_Usr_Type, Ele_Action ' +
        'FROM ELEMENT_METRICS WHERE Ele_Name = ''Inventory'' AND Ele_Type = ''Dropdown'') AS INVTYPE ' +
    'WHERE Stop_Number = ' + Convert(Char(10),@Disposition_Number) + ' AND ' +
        'INVTYPE.Ele_Action = ''B'' AND ' +
        'Box_Number *= RESV.Item_Number AND RESV.Item_Type = ''B'' AND ' +
        'BOX.Stop_Number = DISPOSITION_MEMO.Disposition_Number AND ' +
        'BOX.Stop_Date = DISPOSITION_MEMO.Issue_Date'
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1 回答 1

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您应该遵循以下模式：

SELECT c1_1, c1_2, c2_1, c2_2
FROM t1
LEFT JOIN t2 ON c1_1 = c2_1

*= 被翻译成左连接。

请参阅：https ://en.wikipedia.org/wiki/Join_%28SQL%29#Alternative_syntaxes 。

于 2016-10-18T16:48:19.390 回答