Question

我在SQL Server中有一个名为table1的表，如下所示：

colA
-------
A123
Z123
C123
B123

现在我想使用一个SQL语句来获得如下结果：

ID colA
--------
1  A123
2  Z123
3  C123
4  B123

colA的顺序是表中行的顺序。不需要对它进行排序。

怎么做？非常感谢

Answer 1

这是我在需要递增ID 而不对数据进行排序时总是做的事情（因为我的其他行或行既不是字母也不是按时间顺序排列）。另外，我鄙视使用临时表，除非它们是绝对必要的。

SELECT ROW_NUMBER() OVER 
(
    ORDER BY (SELECT NULL)
) as ID, colA
FROM table1

Answer 2

使用ROW_NUMBER的示例

             SELECT ROW_NUMBER() 
                OVER (ORDER BY colA)  AS Row, 
                colA
                FROM table1

Answer 3

使用Table variable with an Identity column尝试此操作。

colA的顺序是表中行的顺序。不需要排序。

<强> Fiddle demo:

declare @t table(id int identity(1,1), colA varchar(50))

--No ordering done and the same results won't be guaranteed
insert into @t select colA from Table1

select id, colA from @T

结果：

| ID | COLA |
|----|------|
|  1 | A123 |
|  2 | Z123 |
|  3 | C123 |
|  4 | B123 |

Answer 4

在存在动态订单条件时生成行号

select TotalCount = COUNT(U.UnitID) OVER() ,

ROW_NUMBER() over(
    order by 
     (CASE @OrderBy WHEN '1' THEN m.Title  END) ASC ,
     (CASE @OrderBy WHEN '2' THEN m.Title  END) DESC,
     (CASE @OrderBy WHEN '3' THEN Stock.Stock  END) DESC,
     (CASE @OrderBy WHEN '4' THEN Stock.Stock   END) DESC

) as RowNumber,

M.Title,U.ColorCode,U.ColorName,U.UnitID, ISNULL(Stock.Stock,0) as Stock

 from tblBuyOnlineMaster M

    inner join BuyOnlineProductUnitIn U on U.BuyOnlineID=M.BuyOnlineID 

    left join 
            ( select IT.BuyOnlineID,IT.UnitID,ISNULL(sum(IT.UnitIn),0)-ISNULL(sum(IT.UnitOut),0) as Stock 
                from [dbo].[BuyOnlineItemTransaction] IT 
                group by IT.BuyOnlineID,IT.UnitID
             ) as Stock

        on U.UnitID=Stock.UnitID


order by 
 (CASE @OrderBy WHEN '1' THEN m.Title  END) ASC ,
 (CASE @OrderBy WHEN '2' THEN m.Title  END) DESC,
 (CASE @OrderBy WHEN '3' THEN Stock.Stock  END) DESC,
 (CASE @OrderBy WHEN '4' THEN Stock.Stock   END) DESC


offset  @offsetCount rows fetch next 6 rows only

使用SQL Server在select语句中生成增量编号

4 个答案: