透视Oracle查询

Question

为什么以下代码没有返回数据？

SELECT *
FROM (SELECT p_code, short_name,qty_stock
      FROM sample_new.daily_stock)
PIVOT (sum(qty_stock) AS sum_quantity FOR (short_name) IN 
      (SELECT DISTINCT short_name FROM sample_new.daily_stock));

Answer 1

select * from (select p_code,short_name,qty_stock from
sample_new.daily_stock) pivot (sum(qty_stock) as sum_quantity for
(short_name) in (select distinct short_name from
sample_new.daily_stock));

这是一个糟糕的查询。您应该使用inner join或select * from tabel a, tabel b, tabel c

使用distinct：您必须添加分组依据（不同的字段）