为每个类别的 N 行批次设置行号

Question

我有table

+-----+----------+---------+
| id  | name     | phase   |
+-----+----------+---------+
| 101 | Bolt     | PHASE 1 |
| 102 | Nut      | PHASE 1 |
| 103 | Screw    | PHASE 1 |
| 104 | Hex BOLT | PHASE 1 |
| 105 | Rubber   | PHASE 1 |
| 106 | Aluminum | PHASE 2 |
| 107 | Slate    | PHASE 2 |
| 108 | Pen      | PHASE 3 |
| 109 | Pencil   | PHASE 3 |
| 110 | Mouse    | PHASE 3 |
| 111 | Keyboard | PHASE 3 |
+-----+----------+---------+

我想创建另一个列，我必须在其中输入行号。

逻辑：对于 3 行，它应该相同并更改为第 4 行的下一个值。每当 PHASE 发生变化时，它应该转到下一个数字，即使前一个数字的 3 组不完整。

预期输出

+-----+----------+---------+-----+
| id  | name     | phase   | SET |
+-----+----------+---------+-----+
| 101 | Bolt     | PHASE 1 | 1   |
| 102 | Nut      | PHASE 1 | 1   |
| 103 | Screw    | PHASE 1 | 1   |
| 104 | Hex BOLT | PHASE 1 | 2   |
| 105 | Rubber   | PHASE 1 | 2   |
| 106 | Aluminum | PHASE 2 | 3   |
| 107 | Slate    | PHASE 2 | 3   |
| 108 | Pen      | PHASE 3 | 4   |
| 109 | Pencil   | PHASE 3 | 4   |
| 110 | Mouse    | PHASE 3 | 4   |
| 111 | Keyboard | PHASE 3 | 5   |
+-----+----------+---------+-----+

我试过下面的查询，但它没有给我所需的输出。

select *, (row_number() over (order by phase)-1) / 3 as sets
from table_main

实际输出：

+-----+----------+---------+------+
| id  | name     | phase   | sets |
+-----+----------+---------+------+
| 101 | Bolt     | PHASE 1 | 0    |
| 102 | Nut      | PHASE 1 | 0    |
| 103 | Screw    | PHASE 1 | 0    |
| 104 | Hex BOLT | PHASE 1 | 1    |
| 105 | Rubber   | PHASE 1 | 1    |
| 106 | Aluminum | PHASE 2 | 1    |
| 107 | Slate    | PHASE 2 | 2    |
| 108 | Pen      | PHASE 3 | 2    |
| 109 | Pencil   | PHASE 3 | 2    |
| 110 | Mouse    | PHASE 3 | 3    |
| 111 | Keyboard | PHASE 3 | 3    |
+-----+----------+---------+------+

我也尝试过 DENSE_RANK() 但没有得到预期的输出。

FIDDLE HERE

Answer 1

试一试：

WITH CTE
as
(
select *, ROW_NUMBER () OVER (PARTITION BY phase ORDER BY id) as rn
from table_main
)
SELECT *,DENSE_RANK() over (ORDER BY phase ,CEILING(rn/3.0)) as set
FROM CTE

Answer 2

使用 LAG 获取 column 的前一行值，如果它发生变化则添加 1。使用 %3 中提到的 ROW_NUMBER()，然后 sum 这些值如下所示。

;WITH tm AS (
    SELECT *, 
            IIF((LAG(phase, 1) OVER (ORDER BY phase, id)) = phase, 0, 1) AS phase_change,
            IIF((ROW_NUMBER() OVER (PARTITION BY phase ORDER BY phase)-1)%3 = 0, 1, 0) AS [set]
    FROM table_main
) 
SELECT id, 
        name, 
        phase,
        SUM(IIF([set] > phase_change, [set], phase_change)) OVER (ORDER BY phase, id) AS [set]
FROM tm

为每个类别的 N 行批次设置行号

Set row number for batch of N rows per category

sql

sql-server

sql-server-2012

row-number