Question

在下面的查询中，对于o.EventSetName，o.EventSetDisplay，o.EventSetDescription - 任何时候结果中的3列都有重复的ROWS - 只应显示第一个这样的行，其余的重复行应为空白.....

这是sql：

 Select  distinct top 100000 o.EventSetName,       
                             o.EventSetDisplay,
                             o.EventSetDescription,
                             o.ChildSetName,
                             ROW_NUMBER() Over (Order By f.ChildSetName) RN,
                             f.DocumentDispSequence,
                             f.SectionDispSequence,
                             o.ObsSetDispSequence,
                             null                          
                      From   ##ObsSetLevel o,
                             ##Final f
                      Where  f.ChildSetName = o.EventSetName and 
                             o.EventSetName = @variableName
                      Order By RN asc, f.DocumentDispSequence asc, f.SectionDispSequence asc, o.ObsSetDispSequence asc

我没有报告工具，所以现在需要在存储过程本身中完成很多报告逻辑......

所以而不是：

val 1   val2    val3  val7
val 1   val2    val3  val8
val 1   val2    val3  val 10
val 1   val2    val3  x
val 1   val2    val3  y

对于行2,3,4和5

的前3列，我应该获得空白的resullt

Answer 1

在CTE中包含现有查询，添加ROW_NUMBER OVER PARTITION BY列，这将为每组值创建RN。在外部查询中，只需使用CASE选择GRP_RN = 1的值，否则选择空字符串。

WITH CTE AS 
(
    Select  distinct top 100000 
        o.EventSetName,       
        o.EventSetDisplay,
        o.EventSetDescription,
        o.ChildSetName,
        ROW_NUMBER() Over (Order By f.ChildSetName) RN,
        f.DocumentDispSequence,
        f.SectionDispSequence,
        o.ObsSetDispSequence,
        null  as NullColumnNeedsName,
        ROW_NUMBER() OVER (PARTITION BY o.EventSetName, o.EventSetDisplay,o.EventSetDescription ORDER BY f.ChildSetName) GRP_RN
    From   ##ObsSetLevel o,
    INNER JOIN ##Final f ON f.ChildSetName = o.EventSetName and o.EventSetName = @variableName
)
SELECT
    CASE WHEN GRP_RN = 1 THEN o.EventSetName ELSE '' AS EventSetName,
    CASE WHEN GRP_RN = 1 THEN o.EventSetDisplay ELSE '' AS EventSetDisplay,
    CASE WHEN GRP_RN = 1 THEN o.EventSetDescription ELSE '' AS EventSetDescription,
    other columns
FROM CTE  
Order By RN asc, DocumentDispSequence asc, SectionDispSequence asc, o.ObsSetDispSequence asc

PS：我还纠正了你对旧式连接的使用。这种用法在20多年前已经过时，引入了SQL-92标准。 You should avoid using them.

显示结果集中重复值的空格

1 个答案: