Question

Dynamic Table Name Oracle

Asked by: Ashok9

I have a table which Has suffix for the tables.
Let us consider that table as A

A looks like

Column 1
x
y
z

In the same way I have Table which is in the name of M_x, M_y, M_z.

All these tables are the same schema structure.

I know that M_*.

I need to fill the suffix with the Table A.

Basically I need data of all the M_ tables.

If
M_x has
Column 1
3
4

M_y has
Column 1
5
6

M_z has
Column 1
7
8

After using M_ and suffix from A table
the data should look like

Column 1
3
4
5
6
7
8


I need the simple query to this. I dont want to use any cursors or procedures.

I am using Oracle 10g

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Asked On
2009-11-03 at 08:59:56ID24867815
Tags

Oracle

,

SQL

Topics

Oracle 10.x

,

PL / SQL

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: mrjoltcolaPosted on 2009-11-03 at 09:08:38ID: 25731090

>>I need the simple query to this. I dont want to use any cursors or procedures.

Given your requirements, I don't think you will find such a simple query.

Since the table names / suffixes are stored inside table rows, you cannot use that in any sort of dynamic join to query the data in one step.

You'll either have to use PL/SQL and a dynamic SQL (with execute immediate) or generate the SQL to a file or buffer with a "generation" query, then execute the result.

When you have requirements like this, it almost always indicates a design problem.

 

by: mrjoltcolaPosted on 2009-11-03 at 09:10:40ID: 25731115

Another idea: if you are using some host language like VB, C#, Java, etc. you could consider querying all of your "rules" out of the table that has the suffixes, and then keeping those in memory, and using that to dynamically generate the correct SQL each time.

 

by: sdstuberPosted on 2009-11-03 at 09:27:49ID: 25731301

how about this?

I wouldn't classify this as a "simple query",
but it does satisfy your required functionality


SELECT x.column1
FROM a, XMLTABLE('/ROWSET/ROW/X'
PASSING xmltype(DBMS_XMLGEN.getxml('select column1 x from M_' || column1))
COLUMNS column1 NUMBER PATH '//X') x

20120131-EE-VQP-002

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