使用WITH语句的物化视图

Question

我创建了一个物化视图，但我有一个错误，我不明白解决它

SELECT x.*,SUM(x.quantities) as Tquantities

在线

CREATE MATERIALIZED VIEW TestView AS With x AS( SELECT Numclient as CLIENT, Numcommand as COMMAND, count(gender) as quantities FROM customer, Command WHERE Numclient = Numcommand AND gender =2 GROUP BY Numclient, Numcommand ), x1 AS ( SELECT x.*,SUM(x.quantities) as Tquantities FROM x ) SELECT x.*,ROUND(x.quantities*100/x1.Tquantities) as Percent FROM x1, x; 你能帮我解决吗？

j_query data_tables

Answer 1

为了消除错误，请删除原始子查询x.*,中的x1。 您的select语句可以简化，例如：

select Numclient CLIENT, Numcommand COMMAND, count(gender) quantities,
       round(100*count(gender)/sum(count(gender)) over()) percent
  from customer 
  join Command on Numclient = Numcommand and gender = 2
  group by Numclient, Numcommand 

SQLFiddle

有点不清楚为什么你显示列COMMAND，当它等于CLIENT？ 我怀疑这可能是where条件中的错误，或者此列是多余的。

Answer 2

从什么时候开始在Oracle中有效？这不是MySQL。

SELECT x.*,SUM(x.quantities) as Tquantities FROM x

为了使其正常工作，您必须对X中的列进行GROUP BY。