Column names from another table

Hi All,
I have a scenario where i need to get names of a column from another table
for eg,
Table EMP
EmpNo EmpName EmpContact EmpPhone
1 xyz [email protected] 345
2 abc [email protected] 897
3 ttp [email protected] 345
The column names of this table can be configurable from some other place and its value is stored in another table like
Table Config (2 Columns)
Column_Name Value
EmpName First name
EmpContact Email
EmpPhone Mobile
Now i want to fetch the values from Emp table but with column headers that are changed and have a value in Config table.
If a column name is not there in config table then the original column name should come.
As shown below
EmpNo First name Email Mobile
1 xyz [email protected] 345
2 abc     [email protected] 897
3 ttp [email protected] 345
Another eg, If EmpName is not changed and entered in second table , then i want to have the same name as the original EMP table has as shown below.
EmpNo EmpName Email Mobile
1 xyz [email protected] 345
2 abc     [email protected] 897
3 ttp [email protected] 345
In other words something like this,
select empno,
EmpName as (select value from config where column_name=EmpName),
               EmpContact as (select value from config where column_name=Empcontact),
               EmpPhone as (select value from config where column_name=EmpPhone)
     From EMP
Can some one please help me in providing a solution for this.
Edited by: 941386 on May 30, 2013 6:20 AM

Unfortunately, I think this is a job for dynamic sql ...
Build your "query" first:
(note this won't work "as is", fix the syntax - but you get the idea.)
lv_str := 'select empno,
EmpName as ' || (select value from config where column_name=EmpName) || ',
EmpContact as ' || (select value from config where column_name=Empcontact) || ',
EmpPhone as ' || (select value from config where column_name=EmpPhone) || '
From EMP;';
execute immediate lv_str;Not sure if there's a better way or not.
Only other way I can think of is to leverage the way UNION [ALL] works.
So the following query:
select a, b, c from dual
union all
select d, e, f from dual
/returns data in columns "named" : "a, b, c"
Effectively renaming columns d, e, f. You just need to turn your data on edge in that first query, then throw out the rows (I don't know how to get it to work, but perhaps somebody else does?)
[edit]
another thought is create a view over top of the table, query that view, then drop the view :P
that would work nicely - avoid the dynamic SQL. shrug
[edit]
Edited by: Greg.Spall on May 30, 2013 9:37 AM

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