常用SQL整理 - ROW_NUMBER()

DECLARE @TBL TABLE ( A INT, B INT )

INSERT  INTO @TBL
        ( A, B )
VALUES  ( 1, -- A - int
          2  -- B - int
          )

INSERT  INTO @TBL
        ( A, B )
VALUES  ( 1, -- A - int
          3  -- B - int
          )

INSERT  INTO @TBL
        ( A, B )
VALUES  ( 1, -- A - int
          4  -- B - int
          )

SELECT  [@TBL].*
FROM    @TBL
INNER JOIN ( SELECT ROW_NUMBER() OVER ( PARTITION BY A ORDER BY A ) num ,
                    A ,
                    B
             FROM   @TBL ) b
ON      b.A = [@TBL].A
        AND b.num = 2

SELECT  ROW_NUMBER() OVER ( PARTITION BY A ORDER BY A ) num ,
        A ,
        B
FROM    @TBL

SELECT  ROW_NUMBER() OVER ( ORDER BY A ) num ,
        A ,
        B
FROM    @TBL