Question

鉴于此表：

CUTNO    **pattern  style    color**    size    qty  
c0001    jr-7551    SHI      denim-x    10      100  
c0002    jr-7571    HTD      stone      12      250  
c0003    jr-7586    HTD      denim-x    18      200  
c0004    **jr-7512  B/E      mud**      14      500  
c0005    jr-7512    B/E      stone      16      5  
c0006    **jr-7512  B/E      mud**      8       15

我想添加一个包含序列号的列，使得模式，样式和颜色的每个组合都有一个迭代的序列号。例如：

输出

CUTNO    pattern      style    color    size  qty     **seqno**  
c0001    jr-7551      SHI      denim    10    100     **1**  
c0002    jr-7571      HTD      stone    12    250     **1**  
c0003    jr-7586      HTD      denim    18    200     **1**  
c0004    **jr-7512    B/E      mud**    14    500     **1**  
c0005    **jr-7512    B/E      stone**  1     65      **1**  
c0006    **jr-7512    B/E      mud**    8     15      **2**  
c0007    **jr-7512    B/E      stone**  5     300     **2**  
c0008    **jr-7512    B/E      mud**    1     20      **3**

如何编写查询以生成此序列号？

Answer 1

您可以使用窗口函数ROW_NUMBER：

SELECT *,
  [seqno] = ROW_NUMBER() OVER(PARTITION BY pattern, style, color ORDER BY CUTNO)
FROM your_table
ORDER BY CUTNO;

的 LiveDemo

输出：

╔═══════╦═════════╦═══════╦═════════╦══════╦═══════╗ ║ CUTNO ║ pattern ║ style ║ color ║ size ║ seqno ║ ╠═══════╬═════════╬═══════╬═════════╬══════╬═══════╣ ║ c0001 ║ jr-7551 ║ SHI ║ denim-x ║ 10 ║ 1 ║ ║ c0002 ║ jr-7571 ║ HTD ║ stone ║ 12 ║ 1 ║ ║ c0003 ║ jr-7586 ║ HTD ║ denim-x ║ 18 ║ 1 ║ ║ c0004 ║ jr-7512 ║ B/E ║ mud ║ 14 ║ 1 ║ ║ c0005 ║ jr-7512 ║ B/E ║ stone ║ 16 ║ 1 ║ ║ c0006 ║ jr-7512 ║ B/E ║ mud ║ 8 ║ 2 ║ ║ c0007 ║ jr-7512 ║ B/E ║ stone ║ 5 ║ 2 ║ ║ c0008 ║ jr-7512 ║ B/E ║ mud ║ 1 ║ 3 ║ ╚═══════╩═════════╩═══════╩═════════╩══════╩═══════╝

如何从选择查询中计算重复记录

1 个答案: