ORA-00918: column ambiguously defined: how to find the column

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i'm getting the classic error "ORA-00918: column ambiguously defined", usually i know how to solve it, but my problem now is that i'm working with a 700 row query. Is there a way to identify the column?

Thx Daniele

Have you tried to do a binary search?

e.g.

If your original query looks like Select col1 ,col2 ,col3 ,col4 from MyTable

  1. you can start with commenting the 2nd half Select col1 ,col2 /*,col3 ,col4 */ from MyTable

  2. If you still get the error, run the query again commenting some column from the other half:

Select col1 /*col2 */ col3 col4 from MyTable

If you still get an error then your problem is with col1, otherwise you need to change col2

ORA-00918: column ambiguously defined tips, Luckily the solution to this Oracle error is just about as straightforward as finding what causes the problem. What is needed is to add the prefix to each column with​  However, the unfortunate aspect of the ORA-00918 is that there aren’t many preventative measures that can be taken. To keep it from springing up, the only thing you can really do is remain aware of the names that you give columns and pre-attach prefixes to common column names.

The ambiguous column error message indicates that you have joined two (or more) columns in your query which share the same column name.

The proper way to solve this is to give each table in the query an alias and then prefix all column references with the appropriate alias. I agree that won't be fun for such a large query but I'm afraid you will have to pay the price of your predecessor's laxness.

ORA-00918: column ambiguously defined, Error "ORA-00918: column ambiguously defined" Using Custom SQL not contain enough specificity to determine which of these columns to  Alias any duplicated column names to unique column names. For example, in your custom SQL statement, rather than select usertest1.col1, usertest2.col1, from usertest1, usertest2 Write: select usertest1.col1 as 1_col1, usertest2.col1 as 2_col1, from usertest1, usertest2 Cause The same column name exists in at least two separate tables being joined.

In Oracle, you can use all_tab_cols to query the columns names of your tables. The following query will return the common column names between TABLE1 and TABLE2. Then you just need to prefix those common columns instead of all 100 column references.

select column_name from all_tab_cols
where table_name='TABLE1' and owner ='OWNER1' 
and column_name in (
select column_name from all_tab_cols
where table_name='TABLE2' and owner ='OWNER2')  

Error "ORA-00918: column ambiguously defined" Using Custom , results, it gives me this error Oracle database error 918: ORA-00918: column ambiguously defined . Ok, I get that, the error makes sense. Hibernate is likely wrapping the SQL within another query to use Oracle's rownum in filtering the maxresults and firstrows. This will mean that any duplicates (c.Name and d.NAME) will cause exceptions unless aliased as described here: Column ambiguously defined in subquery using rownums.

For posterity's sake: I had this issue when I selected columns TABLE1.DES and TABLE2.DES in a query without aliasing the result. When I ran it alone my SQL editor turned these into DES and DES_1, no complaint.

However when I turned the same query into a subquery

SELECT a.col1, a.col2, a.col3, b.*
from TABLE3 a
INNER JOIN (
--that query as a subquery
) b
on a.PK=b.FK`

it threw the same ORA-00918 error message you described. Changing the SELECT in my subquery to

SELECT TABLE1.DES AS T1_DES, TABLE2.DES AS T2_DES ...

fixed the issue.

"Column ambiguously defined" not |Tableau Community Forums, Learn the cause and how to resolve the ORA-00918 error message in Oracle. You tried to execute a SQL statement that joined two or more tables, where a column with the same name exists in both tables. Alter Table · Alter Tablespace · Change Password · Check Constraints ORA-00918: column ambiguously defined  In Oracle, you can use all_tab_cols to query the columns names of your tables. The following query will return the common column names between TABLE1 and TABLE2.Then you just need to prefix those common columns instead of all 100 column references.

you can check common columns by using :

 select COLUMN_NAME from ALL_TAB_COLS where TABLE_NAME = 'tablenamefirst'
intersect
select COLUMN_NAME from ALL_TAB_COLS where TABLE_NAME = 'tablenamesecond';

Oracle / PLSQL: ORA-00918 Error Message, Error: ORA-00918: column ambiguously defined. Error Message. When executing a query using the ArcSDE SDK API, the following error  Getting ORA-00918: column ambiguously defined: running this SQL: SELECT * FROM (SELECT DISTINCT(coaches.id), people.*, users.*, coaches.* FROM "COACHES" INNER JOIN people ON people.id = coaches.person_id INNER JOIN users ON coaches.person_id = users.person_id LEFT OUTER JOIN organizations_users ON organizations_users.user_id = users.id ) WHERE rownum <= 25

ORA-00918: column ambiguously defined, What is the cause of the "ORA-00918 column ambiguously defined" error? How do I resolve this? Re: ORA-00918: column ambiguously defined JohnWatson2 Sep 12, 2016 7:31 AM ( in response to youvasri ) You have a column named VALUE in both tables.

ORA-00918 column ambiguously defined, i'm getting the classic error "ORA-00918: column ambiguously defined", usually i know how to solve it, but my problem now is that i'm working  When we try to recompile it, it throws this error: PL/SQL: ORA-00918: column ambiguously defined To unambiguously specify tables do something like SELECT x.field1, x.field2, y.field1, y.field2 FROM Table1 x, Table2 y i.e. Specify the table alias in the query - don't leave it to Oracle.

ORA-00918: column ambiguously defined: how to find the column, SQLException: ORA-00918: column ambiguously defined. It is correct that I am querying across multiple tables and that within each of those  Re: "Column ambiguously defined" not really! Konstantinos Drosatos Dec 12, 2016 8:39 AM ( in response to Konstantinos Drosatos ) if you alias the columns but you need to use them as common fields to join the tables then it doesn't work.

Comments
  • nono 700 row of SQL code (about 100 column)
  • What client are you using? Most will direct you to the correct line (or close enough).
  • Oracle SQL Developer, but there is no sign of the row with the error
  • A 700 row query is usually a sign that something is very wrong in the logic.
  • i know, don't have time to rearrange the logic, the query is not mine i just have to fix it, so the only thing i need is to know if there is a way to identify the ambiguous column