Question

我有以下观点

M_VWPROC_sub1，M_VWPROC_sub2，M_VWPROC_sub3，M_VWPROC_sub4，M_VWPROC_sub5， M_VWPROC_sub6，M_VWPROC_sub7，M_VWPROC_sub8，M_VWPROC_sub9

我尝试使用以下sql创建视图。但是我收到以下错误

＃1064 - 您的SQL语法出错;查看与MariaDB服务器版本对应的手册，以获取正确的语法 'M_VWPROC_sub2 union附近所有M_VWPROC_sub3联合所有M_VWPROC_sub4 联合所有M_VWPROC'在第2行

查询：

CREATE OR REPLACE  VIEW M_VWPROC (UNIT, PS_DATE, LOCALIN, STOCKIN, STOCKOUT) AS 
select inner_sub_table.UNIT, 
       inner_sub_table.PS_DATE, 
       sum(inner_sub_table.LOCALIN)LOCALIN, 
       sum(inner_sub_table.pur) STOCKIN, 
       sum(inner_sub_table.sale) STOCKOUT 
  from M_VWPROC_sub1 
 union all M_VWPROC_sub2 
 union all M_VWPROC_sub3 
 union all M_VWPROC_sub4 
 union all M_VWPROC_sub5
 union all M_VWPROC_sub6 
 union all M_VWPROC_sub7 
 union all M_VWPROC_sub8 
 union all M_VWPROC_sub9) 
       inner_sub_table
 group by inner_sub_table.UNIT, inner_sub_table.PS_DATE;

任何帮助。提前致谢。

Answer 1

union all的正确语法需要子查询。。。这是一个select子句。但是，你不能做你想做的事。您需要另一层子查询。类似的东西：

create view v_YetAnotherView as 
 select * from M_VWPROC_sub1 
 union all select * from M_VWPROC_sub2 
 union all select * from M_VWPROC_sub3 
 union all select * from M_VWPROC_sub4 
 union all select * from M_VWPROC_sub5
 union all select * from M_VWPROC_sub6 
 union all select * from M_VWPROC_sub7 
 union all select * from M_VWPROC_sub8 
 union all select * from M_VWPROC_sub9;

然后：

CREATE OR REPLACE  VIEW M_VWPROC (UNIT, PS_DATE, LOCALIN, STOCKIN, STOCKOUT) AS 
select inner_sub_table.UNIT, 
       inner_sub_table.PS_DATE, 
       sum(yav.LOCALIN)LOCALIN, 
       sum(yav.pur) STOCKIN, 
       sum(yav.sale) STOCKOUT 
  from YetAnotherView yav
  group by yav.UNIT, yav.PS_DATE;

请注意，对视图的这种荒谬的限制（from子句不能包含子查询）仅限于MySQL。

无法从其他视图创建mysql视图

1 个答案: