Need help for SQL query

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Hi guys, I have a little problem here. I'm trying to search the data of an object in the database. The problem is, the data is placed in 3 table with identical structure.

I tried this query :

SQL

SELECT   *
  FROM   SPOHON S, APOHON A, LPOHON L
 WHERE   GEOID = '227447'

And it failed, it gives an error saying an unambiguous column exist (or something like that)

And then I tried this one :

SQL

SELECT   *
  FROM   SPOHON S, APOHON A, LPOHON L
 WHERE   S.GEOID = '227447' OR A.GEOID = '227447' OR L.GEOID = '227447';

I failed again, it doesn't return any results (The data is located in table LPOHON)

So, is there any SQL solution for this? or do I have to do my work around like I always do?

Thanks in advance.

Posted 8-Sep-11 18:25pm

Firo Atrum Ventus

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VikashGohil · Accepted Answer · 2011-09-08T18:38:00

Solution 1

I guess you can use UNION in this, like

Select * from SPOHON where GEOID=227447
UNION
Select * from APOHON where GEOID=227447
UNION
Select * from LPOHON where GEOID=227447

Hope that answers your questions

Posted 8-Sep-11 18:38pm

VikashGohil

Comments

Wendelius 9-Sep-11 1:25am

Good anser, + 5. Just added few more things, please see my answer.

Firo Atrum Ventus 9-Sep-11 1:37am

Thanks.

Wendelius · Accepted Answer · 2011-09-08T18:45:00

To add to Vikash answer:

Don't use * in the SELECT clause. For example if a column is added to one of the tables, your query would fail since in UNION all the select statements must return exactly same number of columns and same data types

Another thing. Don't use literals in the query if you're putting it in a program, use bind variables instead. If you're using ODP.NET, see: OracleParameter[^]. Your query would then look something like:

SQL

Select col1, col2 from SPOHON where GEOID=:geoid
UNION
Select col1, col2 from APOHON where GEOID=:geoid
UNION
Select col1, col2 from LPOHON where GEOID=:geoid