Question

我有两张桌子

category
--------

id      product     seq_num
cat12   prod12      0
cat23   prod12      1
cat34   prod12      2

prod
-----

sku     prod    seq_num
sku123  prod12  0
sku234  prod12  1
sku345  prod12  2

我正在尝试使用LISTAGG函数并输出如下输出：

output
------
skuid   prod    catids
sku123  prod12  cat12,cat23,cat34
sku234  prod12  cat12,cat23,cat34
sku345  prod12  cat12,cat23,cat34

当我单独使用类别表时，我可以使用LISTAGG并正确汇总输出（无需skuid）

使用以下查询：

SELECT product,LISTAGG(id, ',') 
WITHIN GROUP (ORDER BY id) AS catids
FROM category
GROUP BY product;

但我无法将此与prod表连接并获得所需的输出。请帮忙。

Answer 1

您可以在加入后执行此操作：

SELECT s.sku,t.product,
       LISTAGG(t.id, ',') WITHIN GROUP (ORDER BY id) AS catids
FROM category t
INNER JOIN prod s
 ON(t.product = s.prod)
GROUP BY t.product,s.sku;

Answer 2

您可以按如下方式编写查询：

SELECT p.sku "skuid", c.product "prod",
       LISTAGG(c.id, ',') WITHIN GROUP (ORDER BY id) 
         OVER (PARTITION BY c.product) AS catids
  FROM category c
  INNER JOIN prod p 
    ON c.product = p.prod
  ORDER BY "skuid", c.product;

你也可以检查一下； it is more complicated version of usage together of listagg and join functions

在Oracle中使用LISTAGG函数

2 个答案: