Question

如何转换此表：

+---------------------+-------------------------------+-------+-------+
|       PropertyName  |           Emergency           | Count | Total |
+---------------------+-------------------------------+-------+-------+
| IH                  | No                            |     8 |    12 |
| IH                  | No Water                      |     1 |    12 |
| IH                  | Smoke  Alarm not working      |     1 |    12 |
| IH                  | Broken Lock - Exterior        |     1 |    12 |
| IH                  | Leaking Water                 |     1 |    12 |
| GG                  | No                            |     5 |    10 |
| GG                  | Leaking Water                 |     3 |    10 |
| GG                  | Property Damage (Significant) |     1 |    10 |
| GG                  | Toilet - Clogged (1 Bathroom) |     1 |    10 |
| PLB                 | No                            |     5 |    10 |
| PLB                 | Resident Locked Out           |     2 |    10 |
| PLB                 | Smoke  Alarm not working      |     1 |    10 |
| PLB                 | Tub - Clogged (1 Bathroom)    |     1 |    10 |
| PLB                 | Leaking Water                 |     1 |    10 |
+---------------------+-------------------------------+-------+-------+

像这样：

+---------------------+-------------------------------+-------+-------+
|       PropertyName  |           Emergency           | Count | Total |
+---------------------+-------------------------------+-------+-------+
| IH                  | No                            |     8 |    12 |
|                     | No Water                      |     1 |       |
|                     | Smoke  Alarm not working      |     1 |       |
|                     | Broken Lock - Exterior        |     1 |       |
|                     | Leaking Water                 |     1 |       |
| GG                  | No                            |     5 |    10 |
|                     | Leaking Water                 |     3 |       |
|                     | Property Damage (Significant) |     1 |       |
|                     | Toilet - Clogged (1 Bathroom) |     1 |       |
| PLB                 | No                            |     5 |    10 |
|                     | Resident Locked Out           |     2 |       |
|                     | Smoke  Alarm not working      |     1 |       |
|                     | Tub - Clogged (1 Bathroom)    |     1 |       |
|                     | Leaking Water                 |     1 |       |
+---------------------+-------------------------------+-------+-------+

我想做的是，如果PropertyName与上一行的下一行相同，则应该省略。对于总计应该是相同的。

我无法尝试LAG/LEAD，因为我们仅使用SQL SERVER 2008-我知道这简直太可笑了。

Answer 1

您可以在CTE表达式中生成行号，然后按PropertyName选择最上面的行号：

  ;with tableWithRowNums as( 
    select ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) AS rownum, 
            PropertyName,
            Emergency,
            Count,
            Total
    from the_table ),
  first_rows as (
    select min(rownum) as first_row,
            PropertyName 
    from tableWithRowNums
    group by rowNums.PropertyName
  )
  select ISNULL(first_rows.PropertyName, ''),
        tableWithRowNums.Emergency,
        tableWithRowNums.Count,
        tableWithRowNums.Total  
  from tableWithRowNums
    left join first_rows on first_rows.first_row = tableWithRowNums.rownum
  order by tableWithRowNums.rownum;

Answer 2

通常，最好在应用程序级别完成此操作。但是，在您的情况下，您似乎只是想要“否”行上的值。您可以使用一些case表达式来完成此操作：

select (case when Emergency = 'No' then PropertyName end) as PropertyName,
       Emergency, Count,
       (case when Emergency = 'No' then Total end) as total
from t
order by max(total) over (partition by PropertyName) desc,  -- you seem to want the largest total first
         t.PropertyName, 
         (case when Emergency = 'No' then 1 else 2 end),
         t.Total desc;

ORDER BY非常重要。除非最外面的SELECT有一个ORDER BY ，否则不能保证SQL查询以任何特定的顺序返回结果。

如果与上一行相同，如何将后续行的值设置为空

2 个答案: