Question

我正在加入2个表并显示InvNumber，InvAmount和JobNumber的数据。我只需要在第一行显示InvNumber和InvAmount。发票有多个应显示的作业编号。

HEre是DDL

DECLARE @Date datetime;
SET @Date = GETDATE();

DECLARE @TEST_DATA TABLE
(
    DT_ID INT       IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED
   ,InvNumber       VARCHAR(10)   NOT NULL
   ,InvAmount       VARCHAR(10)   NOT NULL
   ,JobNumber       VARCHAR(10)   NOT NULL
);

INSERT INTO @TEST_DATA (InvNumber, InvAmount,JobNumber) 
VALUES
  ('70001', '12056','J65448')
 ,('70001', '12056','J12566')
 ,('70001', '12056','J35222')
 ,('70001', '12056','J45222')
 ,('70001', '12056','456855')
 ,('70001', '12056','J55254')

;

SELECT 
    J.DT_ID
    ,InvNumber
    ,InvAmount
    ,JobNumber

FROM @TEST_DATA AS J

Answer 1

您可以使用ROW_NUMBER和CASE表达式执行类似的操作。

SELECT  DT_ID,
        CASE WHEN RN = 1 THEN InvNumber
                ELSE ''
        END InvNumber,
        CASE WHEN RN = 1 THEN InvAmount
                ELSE ''
        END InvAmount,
        JobNumber
FROM    (SELECT DT_ID,
                InvNumber,
                InvAmount,
                JobNumber,
                ROW_NUMBER() OVER (PARTITION BY InvNumber,InvAmount ORDER BY DT_ID) RN
            FROM   @TEST_DATA
        ) j

Answer 2

使用SQL你无法轻易做到这一点。

您可以在select语句中使用GROUP BY子句来按发票对JobNumbers进行分组。

Answer 3

我几乎符合JamieD77的回答。但我不确定这个解决方案是否会显示所有InvNumbers和所有InvAmounts（如果有的话）。所以，这就是我的建议：

select  td.DT_ID,
        case when td.DT_ID = j.DT_ID then td.InvNumber
             else ''
        end as InvNumber,
        case when td.DT_ID = j.DT_ID then td.InvAmount
             else ''
        end as InvAmount,
        td.JobNumber
from    @TEST_DATA as td
left join (
           select   InvNumber,
                    InvAmount,
                    min(DT_ID) as DT_ID
           from     @TEST_DATA
           group by InvNumber,
                    InvAmount
          ) j

仅显示SQL中的第一行

3 个答案: