Using SQL alias column names in same SQL

Hi,
I am converting some Teradata SQL queries and these queries have the ability to use column defined aliases within the same query, something like :
SQL> select 'test' as alias1, 'test2' as alias2, alias1 from dual
Does anyone know how I can get Oracle to do this ????
Many thanks
Ben

Hi,
Yes I did think of that - its just the queries calculated columns are quite large - sample below show a value calculated currently based on alias names - just trying to find an easier way to apply.
I was hoping for some magical syntax that has eluded me !
Ben
(exp(case when (constant_contrib + fsnumber_contrib + herolevel_contrib + is_colmans_contrib + is_heinz_contrib + is_short_life1_contrib + is_short_life2_contrib + is_short_life3_contrib + logcount_prod_contrib + offer_shelf_cap_contrib + promointensity_contrib + std_shelf_cap_contrib + xforprice_add_1_contrib + ( (power(sh_ms_variables.xfspr,1)) * formula_coefficients.coeff_xfspr1 ) + ( (power(sh_ms_variables.xfspr,2)) * formula_coefficients.coeff_xfspr2 ) + ( (power(sh_ms_variables.xfspr,3)) * formula_coefficients.coeff_xfspr3 ) + ( (power(sh_ms_variables.xfspr,4)) * formula_coefficients.coeff_xfspr4 ) + ( sh_ntnl_variables.xnfor2 * formula_coefficients.coeff_xnfor2 ) + ( sh_ms_variables.xnforfs1 * formula_coefficients.coeff_xnforfs1 ) + ( sh_ms_variables.xnforfs2 * formula_coefficients.coeff_xnforfs2 ) + ( sh_ms_variables.xnforfspl * formula_coefficients.coeff_xnforfspl ) + ( sh_ntnl_variables.xnforpl * formula_coefficients.coeff_xnforpl ) + ( (power(sh_ms_variables.xpr,1)) * formula_coefficients.coeff_xpr1 ) + ( (power(sh_ms_variables.xpr,2)) * formula_coefficients.coeff_xpr2 ) + ( (power(sh_ms_variables.xpr,3)) * formula_coefficients.coeff_xpr3 ) + ( (power(sh_ms_variables.xpr,4)) * formula_coefficients.coeff_xpr4 )) < 500 then (constant_contrib + fsnumber_contrib + herolevel_contrib + is_colmans_contrib + is_heinz_contrib + is_short_life1_contrib + is_short_life2_contrib + is_short_life3_contrib + logcount_prod_contrib + offer_shelf_cap_contrib + promointensity_contrib + std_shelf_cap_contrib + xforprice_add_1_contrib + ( (power(sh_ms_variables.xfspr,1)) * formula_coefficients.coeff_xfspr1 ) + ( (power(sh_ms_variables.xfspr,2)) * formula_coefficients.coeff_xfspr2 ) + ( (power(sh_ms_variables.xfspr,3)) * formula_coefficients.coeff_xfspr3 ) + ( (power(sh_ms_variables.xfspr,4)) * formula_coefficients.coeff_xfspr4 ) + ( sh_ntnl_variables.xnfor2 * formula_coefficients.coeff_xnfor2 ) + ( sh_ms_variables.xnforfs1 * formula_coefficients.coeff_xnforfs1 ) + ( sh_ms_variables.xnforfs2 * formula_coefficients.coeff_xnforfs2 ) + ( sh_ms_variables.xnforfspl * formula_coefficients.coeff_xnforfspl ) + ( sh_ntnl_variables.xnforpl * formula_coefficients.coeff_xnforpl ) + ( (power(sh_ms_variables.xpr,1)) * formula_coefficients.coeff_xpr1 ) + ( (power(sh_ms_variables.xpr,2)) * formula_coefficients.coeff_xpr2 ) + ( (power(sh_ms_variables.xpr,3)) * formula_coefficients.coeff_xpr3 ) + ( (power(sh_ms_variables.xpr,4)) * formula_coefficients.coeff_xpr4 )) else 500 end ) - 1) AS uplift,
Edited by: user485052 on Dec 10, 2010 3:08 AM

Similar Messages

How to use a calculated column in the same query

Hi All,
I need some help with using a calculated column in the same query.
For eq
I am joining a couple of tables and some of the select columns are calculated based on the columns of the tables and i want a new column in the same query to use this calculated feild in some other calcualtion.
something like this...
select (12+3) as Sum1, (12-3) as Sum2, (Sum1 + Sum2 ) as Sum3
from dual
or
select (12+3) as "Sum1", (12-3) as "Sum2", CASE WHEN ( "Sum1" / "Sum2" * 100 > 0 ) THEN 'Yes' ELSE 'No' END
from dual
Thanks

user548171 wrote:
select (12+3) as Sum1, (12-3) as Sum2, (Sum1 + Sum2 ) as Sum3
from dual
or
select (12+3) as "Sum1", (12-3) as "Sum2", CASE WHEN ( "Sum1" / "Sum2" * 100 > 0 ) THEN 'Yes' ELSE 'No' END
from dual
ThanksWhat about just repeating the column values:
select (12+3) as "Sum1", (12-3) as "Sum2", CASE WHEN ( (12+3) / (12-3) * 100 > 0 ) THEN 'Yes' ELSE 'No' END FROM DUAL

Can I use dynamic alias to name a column?

I guys. I just want to know if it is possible to assign dynamic names to a column. for instance:
SQL> select sysdate+1 from dual;
SYSDATE+1
09-JUL-08the column name is SYSDATE+1. can I do something like:
SQL> select 1 as (select sysdate from dual) from dual;(this throws error)
The reason for this requirement is that I need to assign a column name according to a value that comes from a parameter. So, instead of returning something like:
SQL> select sysdate, sysdate+1 from dual;
SYSDATE SYSDATE+1
08-JUL-08 09-JUL-08I need to find a way to return something like:
SQL> select sysdate as <<dynamic column name based on parameter that has been passed in>>, sysdate+1 AS <<dynamic column name based on parameter that has been passed in>> from dual;Obviously I can use something like:
select sysdate as "08-JUL-08", sysdate+1 AS "09-JUL-08" from dual;But in this case I'm hard coding it. I need this alias to be dynamic.
Any way to do it?

Why? Column names are a "programming thing" - not a "display thing".
When you render the columns, you can decide what and how to display them. It does not make any sense to attempt to do this dynamically.
Why not?
Sharable SQL.
Everytime you create a SQL and dynamically change the column aliases, you create a brand new unique SQL - even if the rest of the SELECT is exactly the same. This means you are stuffing the shared pool full of non-sharable SQL.
This is bad for performance (lots of hard parsing). It is bad for the shared pool (memory fragmentation).

Passing parameters to table valued functions and using parameters as column name on select

I am creating a function where I want to pass it parameters and then use those parameters in a select statement. When I do that it selects the variable name as a literal not a column. How do I switch that context.
Query:
ALTER FUNCTION [dbo].[ufn_Banner_Orion_Employee_Comparison_parser_v2]
@BANNER_COLUMN AS VARCHAR(MAX),
@ORION_COLUMN AS VARCHAR(MAX)
RETURNS @Banner_Orion_Employee_Comparison TABLE
LAST_NAME nvarchar(max),
EMPNO int,
BannerColumnName nvarchar(max),
BANNER nvarchar(max),
ORION nvarchar(max)
AS
BEGIN
INSERT INTO @Banner_Orion_Employee_Comparison
(LAST_NAME, BANNER, ORION)
SELECT
a.LAST_NAME, @BANNER_COLUMN, @ORION_COLUMN
FROM OPENQUERY(ORCLPROD_APDORACLE, 'select LAST_NAME, BANNER_RANK, BADGE, EMP_STATUS from XTRACT_VIEW') AS a
inner join IWM_Stage.dbo.ViewPersonnel AS b
on a.BADGE = b.badge
WHERE a.EMP_STATUS = 'A'
and a.BANNER_RANK <> b.[rank]
RETURN;
END;
GO
Output
I execute this:
select * from ufn_Banner_Orion_Employee_Comparison_parser_v2 ('a.BANNER_RANK' , 'b.[rank]')
and get:
Cerecerez NULL
NULL a.BANNER_RANK
b.[rank]

George,
You could go for using a CASE statement as earlier mentioned by Erland. This would look like below: (Downside is that you need to be mentioning all possible values in the CASE)
ALTER FUNCTION [dbo].[ufn_Banner_Orion_Employee_Comparison_parser_v2]
@BANNER_COLUMN AS VARCHAR(MAX),
@ORION_COLUMN AS VARCHAR(MAX)
RETURNS @Banner_Orion_Employee_Comparison TABLE
LAST_NAME nvarchar(max),
EMPNO int,
BannerColumnName nvarchar(max),
BANNER nvarchar(max),
ORION nvarchar(max)
AS
BEGIN
INSERT INTO @Banner_Orion_Employee_Comparison(LAST_NAME, BANNER, ORION)
SELECT
a.LAST_NAME
, CASE @BANNER_COLUMN WHEN 'a.BANNER_RANK' THEN a.BANNER_RANK WHEN 'a.BADGE' THEN a.BADGE END --put values as required
, CASE @ORION_COLUMN WHEN 'b.[rank]' THEN b.[rank] END --put values as required
FROM OPENQUERY(ORCLPROD_APDORACLE, 'select LAST_NAME, BANNER_RANK, BADGE, EMP_STATUS from XTRACT_VIEW') AS a
inner join IWM_Stage.dbo.ViewPersonnel AS b
on a.BADGE = b.badge
WHERE a.EMP_STATUS = 'A'
and a.BANNER_RANK <> b.[rank]
RETURN;
END;
GO
Another method that I would suggest is to get all values from the function, then build a dynamic query to obtain results from it .. Something like:
ALTER FUNCTION [dbo].[ufn_Banner_Orion_Employee_Comparison_parser_v2]()
RETURNS @Banner_Orion_Employee_Comparison TABLE
LAST_NAME nvarchar(max),
EMPNO int,
BannerColumnName nvarchar(max),
BANNER nvarchar(max),
ORION nvarchar(max)
AS
BEGIN
INSERT INTO @Banner_Orion_Employee_Comparison(LAST_NAME, BANNER, ORION)
SELECT
* --Returns all the columns
FROM OPENQUERY(ORCLPROD_APDORACLE, 'select LAST_NAME, BANNER_RANK, BADGE, EMP_STATUS from XTRACT_VIEW') AS a
inner join IWM_Stage.dbo.ViewPersonnel AS b
on a.BADGE = b.badge
WHERE a.EMP_STATUS = 'A'
and a.BANNER_RANK <> b.[rank]
RETURN;
END;
GO
--Execution
DECLARE @BANNER_COLUMN AS VARCHAR(MAX), @ORION_COLUMN AS VARCHAR(MAX),@SQL NVARCHAR(MAX)
SET @BANNER_COLUMN='BANNER_RANK'
SET @ORION_COLUMN='[rank]'
SET @SQL='
select LAST_NAME,'+@BANNER_COLUMN+','+@ORION_COLUMN+' from ufn_Banner_Orion_Employee_Comparison_parser_v2 ()'
PRINT @SQL
EXEC @SQL
You just need to make sure that the column names returned by the function are UNIQUE (Using proper alias names) so that you don't have a problem referring to them from the outside..
Thanks,
Jay
<If the post was helpful mark as 'Helpful' and if the post answered your query, mark as 'Answered'>

How to make dynamic query using DBMS_SQL variable column names

First of all i will show a working example of what i intend to do with "EXECUTE IMMEDIATE":
(EXECUTE IMMEDIATE has 32654 Bytes limit, which isn't enough for me so i'm exploring other methods such as DBMS_SQL)
-------------------------------------------------CODE-----------------------------------
create or replace PROCEDURE get_dinamic_query_content
(query_sql IN VARCHAR2, --any valid sql query ('SELECT name, age FROM table')
list_fields IN VARCHAR2) --list of the columns name belonging to the query ( arr_list(1):='name';   arr_list(2):='age';
-- FOR k IN 1..arr_list.count LOOP
-- list_fields := list_fields || '||content.'||arr_list(k)||'||'||'''~cs~'''; )
AS
sql_stmt varchar (30000);
BEGIN
               sql_stmt :=
'DECLARE
     counter NUMBER:=0;
auxcontent VARCHAR2(30000);
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     content content_cursor%rowtype;
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          open content_cursor;
          loop
               fetch content_cursor into content;
               exit when content_cursor%notfound;
               begin
                    auxcontent := auxcontent || '||list_fields||';
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          htp.prn(auxcontent);
     END;';
EXECUTE IMMEDIATE sql_stmt;
END;
-------------------------------------------------CODE-----------------------------------
I'm attepting to use DBMS_SQL to perform similar instructions.
Is it possible?

Hi Pedro
You need to use DBMS_SQL here because you don't know how many columns your query is going to have before runtime. There are functions in DBMS_SQL to get information about the columns in your query - all this does is get the name.
SQL> CREATE OR REPLACE PROCEDURE get_query_cols(query_in IN VARCHAR2) AS
2 cur PLS_INTEGER;
3 numcols NUMBER;
4 col_desc_table dbms_sql.desc_tab;
5 BEGIN
6 cur := dbms_sql.open_cursor;
7 dbms_sql.parse(cur
8 ,query_in
9 ,dbms_sql.native);
10 dbms_sql.describe_columns(cur
11 ,numcols
12 ,col_desc_table);
13 FOR ix IN col_desc_table.FIRST .. col_desc_table.LAST LOOP
14 dbms_output.put_line('Column ' || ix || ' is ' ||
15 col_desc_table(ix).col_name);
16 END LOOP;
17 dbms_sql.close_cursor(cur);
18 END;
19 /
Procedure created.
SQL> exec get_query_cols('SELECT * FROM DUAL');
Column 1 is DUMMY
PL/SQL procedure successfully completed.
SQL> exec get_query_cols('SELECT table_name, num_rows FROM user_tables');
Column 1 is TABLE_NAME
Column 2 is NUM_ROWS
PL/SQL procedure successfully completed.
SQL> exec get_query_cols('SELECT column_name, data_type, low_value, high_value FROM user_tab_cols');
Column 1 is COLUMN_NAME
Column 2 is DATA_TYPE
Column 3 is LOW_VALUE
Column 4 is HIGH_VALUE
PL/SQL procedure successfully completed.I've just written this as a procedure that prints out the column names using dbms_output - I guess you're going to do something different with the result - maybe returning a collection, which you'll then parse through in Apex and print the output on the screen - this is just to illustrate the use of dbms_sql.
best regards
Andrew
UK

How to spool the null alias column names in sppol file

Hi,
I have to spool the data and having some issues.
SELECT DISTINCT a.market_name,a.market_code,*''as empid* from ssp2_pcat.markets a ;
in the above select sql I have created extra null column as empid
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a.market_name||'~'||a.market_code||'~'||'''empid'
SSB ~25010~' empid
In the feed file it should be null. but the alias column is populted with empid
Can you please let me know what is wrong here?
Thanks,

SELECT DISTINCT a.market_name,a.market_code,*''as empid* from ssp2_pcat.markets a ;
in the above select sql I have created extra null column as empid
when I spool with tild dilimited I am not getting column name(empid) in spool file.
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SSB ~25010~' empid
In the feed file it should be null. but the alias column is populted with empid
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Example :
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5   , SAL NUMBER CONSTRAINT A_SAL_POSITIVE CHECK (SAL > 0)
6   , CONSTRAINT A_PRIMARY_KEY PRIMARY KEY (ID1, ID2)
7 )
8 /
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2    FROM USER_CONS_COLUMNS
3   WHERE TABLE_NAME = 'A'
4   ORDER BY CONSTRAINT_NAME, POSITION
5 /
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A_PRIMARY_KEY                           2 ID2
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v_sql varchar2(4000);
v_sql2 varchar2(4000);
cursor c1 is select distinct fc_code, fc_desc from
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Hi Guys,
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PL
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0
1
0
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check this out.
I still believe it is a formatting issue.
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/*Output */
DECODE(EMP
30
20
30
20
10
/* now*/
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DECODE(EMPNO,7369,JOB||HIREDATE||SAL||DEPTNO,DEPTNO)
CLERK17-DEC-8080020
30
30
20
30
30
10
20
10
30
20
try setting set line 1200 and then running that query.
Cheers!!!
Bhushan

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I am trying to change the name of a column in my Oracle database using SQL PLUS. This is what I'm doing:
ALTER TABLE projects
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Hang on: you're trying to rename a column called NAME?
That's one of Oracle's reserved keywords so should never have been used as a column name in the first place:
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KEYWORD                            LENGTH R R R R D
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Table created.
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Table altered.
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EA 2.1 - SQL autoformat does not capitalize some column names

Hi,
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Hi,
I think it is due to Oracle keywords which can be used as column names.
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In my opinion, it works just fine.
In the first place, we should avoid using keywords as column name.
However, as in your case, when we need the column to be formatted as desire,
Perhaps the developer should give some handling over the keywords themselves.
SELECT <to be treated as column> FROM <to be treated> WHERE <to be treated>
UPDATE <to be treated> SET <to be treated> WHERE <to be treated>
CREATE TABLE / VIEW <to be treated>
Wow... that would be a long list of handling.
And it would turn out to be double time efforts on the case conversion though.
Regards,
Buntoro

Dynamic Column Names using Refcursors

Hi,
I have a stored procedure which returns a refcursor. The refcursor contains a SQL query in which the column names and number of columns vary dynamically based on the date parameters passed.
"My objective is to return certain XYZ details of employees for a certain month range."
For ex: For the month of Aug-2011, the column names would be '1-AUG-11' to '31-AUG-11 and for Feb-2011 '1-FEB-11' to '28-FEB-11'
My issue is, when I execute the refcursor query using "EXEC", my column names/headings are preserved.
FIELD NAMES: EMPLOYEE_CODE XYZ_TYPE *1-AUG-11* *2-AUG-11* ... *31-AUG-11*
DATA: EMPCODE_Z TYPE1 VALUE_1 VALUE_1 ... VALUE_31
Whereas when I fetch the refcursor into a collection of nested table and display, my column names are lost.
DATA: EMPCODE_Z TYPE1 VALUE_1 VALUE_1 ... VALUE_31
Is there a way where I can preserve the column names from the refcursor after fetching into pl/sql collections?
Any help would be highly appreciated.
Thank you.
Edited by: 867622 on Nov 11, 2011 4:38 PM

867622 wrote:
If not dynamic SQL, how can the number of columns be altered based on the input parameters?Cannot. A dynamic SQL projection means dynamic SQL (there's an exception to this, and despite interesting is not relevant to 99.99% of problems dealing with dynamic SQL projections).
You can however still use a dynamic projection and wrap that into a user defined type interface.
Here's the basic approach:
// create a user define type that will provide the wrapper for the SQL projection
create or replace type TString as table of varchar2(4000);
// build dynamic SQL projections via this type, e.g.
select
TStrings( object_id, object_name, created )
from user_objects
select
TStrings( emp_id, dept_id, salary, commission )
from employeesDespite the SQL cursors being different and the columns and number of columns being selected different, the SQL projection of both are the same. The Count method tells you the number of columns in the projection. Referencing an applicable column is simply done by using the column's sequential number in the projection.
You also do not have to use a collection or varchar2 as the wrapper type - you can create complex user objects and use the collection type for that, as the SQL projection.
Another alternative is converting the ref cursor into a DBMS_SQL cursor and using the latter's describe interface to dynamically determine the structure of the SQL projection and fetching the column values from it. But 11gr1 or later is needed for doing this.

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