这个问题很奇怪。。。按理说,如果是因为M未明确指定的原因,oracle应该给报个“ORA-00918: column ambiguously defined”才是。 当然,避免问题出现的解决办法很简单,就是为where条件里的列M指定表别名: select A.M,B.N from Table1 A left join Table2 B on A.Table2_SID =
In Application Express 18.1, the column names of the query result set must be unique, otherwise a "Column Ambiguously Defined" error occurs. You must change any non-unique report queries present in your current applications. Classic reports which select a ROWID column without a column alias ...
这两个表中通用但未在USING子句中使用的列必须以表别名为前缀,否则会出现“column ambiguously defined(定义的列含糊不清)”错误。 在下面的语句中,manager_id既在employees表中又在departments表中,如果manager_id不以表别名为前缀,则会收到“column ambiguously defined(定义的列含糊不清)”错误。 下面的语句是有效...
概述: Oracle crash querying multiple tables with the same column name "ORA-00918: column ambiguously defined"→ Oracle crash querying multiple tables with the same column name when limit/offset is used.comment:9 by Simon Charette, 7年 ago 严重性: Normal→ Release blocker From https://...
In the absence of the explicit aliases the first query should produce an execution plan; but when both tables are given the same alias the attempt to explain (or run) the query produced the error “ORA-00918: column ambiguously defined” –and that’s arguably a good thing. The second que...
• NATURAL JOIN根据相同的列名联接两个表 • JOIN table2 USING column_name根据列名执行等值联接 • JOIN table2 ON table1.column_name = table2.column_name根据ON子句中的条件执行等值联接 • LEFT/RIGHT/FULL OUTER用于执行OUTER联接 • CROSS JOIN用于返回两个表的笛卡尔积 ...
• table1.column表示从中检索数据的表和列 • NATURAL JOIN按照相同的列名联接两个表 • JOIN table2 USING column_name按照列名执行等值联接 • JOIN table2 ON table1.column_name = table2.column_name按照ON子句中的条件执行等值联接 • LEFT/RIGHT/FULL OUTER用于执行OUTER联接 • CROSS JOIN用于...
#oracle传统语法,不使用ANSI连接,如inner join、left join、right join、full outer join,而使用(+)来表示外连接. 用(+)来实现, 这个+号可以这样来理解: + 表示补充,即哪个表有加号,这个表就是匹配表。如果加号写在右表,左表就是全部显示,所以是左连接。#内链接selectregion_name,country_namefromregions,cou...
ORA-00918: column ambiguously defined error意味着在SQL中，你连接了两个具有相同列的表，但是你不知道...
ORA-00918: column ambiguously defined error意味着在SQL中，你连接了两个具有相同列的表，但是你不知道...