Question

我们正在开展任务和假期项目。

表结果是：

            Rn  TicketNo    task                Assigned    emp
            1   a           Holdiay             sunday      emp_A
            2   a           Task A completed    monday      emp_A
            1   b           Holiday             sunday      emp_B
            2   b           Task A completed    monday      emp_B

我想要以下结果。

            TicketNo    emp     sunday   monday
            a          emp_A    Holdiay  Task A completed
            b          emp_B    Holiday  Task A completed

我在不使用数据透视的情况下尝试查询。不要求帮助。

Answer 1

您可以使用以下quries将行数据转换为列。试一试。

1.使用支点

            select distinct  TicketNo,emp,sunday,monday
            from
            (
              select distinct  TicketNo ,task,  Assigned,emp from <tbl_name>
            ) src
            pivot
            (
              max(task)
              for Assigned in (sunday, monday)
            ) piv

2.使用联接:(没有Pivot）

            select  a.ticketno,
                     a.emp
                    ,a.task as sunday
                    ,b.task as monday
                     from <tbl_name> a join <tbl_name> b 
                     on a.assigned='sunday' and b.assigned='monday' 
                     and a.ticketno=b.ticketno

Answer 2

我使用子查询和连接以不同的方式尝试了它。无论如何，你已经有了答案。

SELECT * INTO YOUR_TABLE  FROM 
(            SELECT 1 AS Rn,'a' AS TicketNo,'Holiday' as task,'sunday' as Assigned,'emp_A' as emp
            UNION ALL
            SELECT 2,'a','Task A completed','monday','emp_A' UNION ALL
            SELECT 1,'b','Holiday','sunday','emp_B' UNION ALL
            SELECT 2,'b','Task A completed','monday','emp_B'
) X

SELECT * FROM YOUR_TABLE


SELECT T1.TicketNo
       ,T1.emp
       ,T1.Sunday
       ,T2.Monday
FROM       
(SELECT TicketNo
       ,emp
       ,CASE WHEN task='Holiday' then 'Holiday' end as Sunday
FROM YOUR_TABLE
WHERE CASE WHEN task='Holiday' then 'Holiday' end IS NOT NULL) T1

JOIN 

(SELECT TicketNo
       ,emp
       ,CASE WHEN task='Task A completed' then 'Task A completed' end as Monday
FROM YOUR_TABLE
WHERE CASE WHEN task='Task A completed' then 'Task A completed' end IS NOT NULL) T2

ON T1.TicketNo = T2.TicketNo

SQL将行转换为列

2 个答案: