使用联合声明在pl中创建视图时出错sql

下面是声明：

create view "test" AS 
select 
ppt.reportingtime reportingtime, 
ppt.currency currency, 
ppt.channelid channelid, 
ppt.transactiontype ttype 
FROM preprocessortransactions ppt 
union 
select 
bm.balancetype balancetype 
from balancemovements bm

该错误消息我得到的是以下几点：

Error starting at line 1 in command:

create view "test" AS SELECT
ppt.reportingtime reportingtime, ppt.currency currency, ppt.channelid channelid, ppt.transactiontype ttype FROM preprocessortransactions ppt union select bm.balancetype balancetype from balancemovements bm

Error at Command Line:1 Column:22 Error report: SQL Error: ORA-01789: query block has incorrect number of result columns 01789. 00000 - "query block has incorrect number of result columns" *Cause:
*Action:

我非常新的PL SQL和我想不通的意义报错。

我还尝试在第一个AS运算符之前列出括号中的列名，但没有成功。

来源

2017-10-05 ehammer

你需要有两个查询的联合编号相同数量的字段。目前，您在顶部有4个字段，底部有1个字段。 – Matt

谢谢你的帮助。为了让工会声明起作用，是否有任何创建空白的方法？ – ehammer

你想让bm.balancetype坐在哪个字段？ – Matt

按照使用NULL的要求插入空白。

CREATE VIEW "test" AS 
SELECT ppt.reportingtime reportingtime, ppt.currency currency, ppt.channelid channelid, ppt.transactiontype ttype 
FROM preprocessortransactions ppt 
UNION 
SELECT NULL, NULL, NULL, bm.balancetype balancetype 
FROM balancemovements bm

来源

2017-10-05 10:26:53 Matt

在这种情况下工会 & unionall你应该给同桌的属性在这两个查询。

例如：

select a,b,c from test 
union 
--- in this you don't have a,b attribute in your second query, you can use null in their place. 
select '','',c from test

注意：您可以使用'' or NULL所以您的查询如：

create view "test" 
as 
    select 
     ppt.reportingtime reportingtime, 
     ppt.currency currency, 
     ppt.channelid channelid, 
     ppt.transactiontype ttype,'' 
    from 
     preprocessortransactions ppt 

    union 

    select 
     '', '', '', '', bm.balancetype balancetype 
    from 
     balancemovements bm

希望它会帮助你。所有最好的

来源

2017-10-06 03:55:36

使用联合声明在pl中创建视图时出错sql

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