Select distinct column

Dear Sir,
My table columns are below
rolno,sub_code,exam_type,marks
datas are below
1 1 regular 50
1 1 supplementary 50
1 2 regular 70
1 3 regular 80
2 1 regular 50
2 2 regular 60
2 3 regular 70
2 4 regular 60
3 1 regular 50
3 1 supplementary 70
3 2 regular 60
3 3 regular 80
3 4 regular 60
my query needs to fetch like this if there is equal mark for same sub_code in regular and supplementary it should fetch the supplementary and all the student who have appear for the supplementary
1 1 regular 50
1 1 supplementary 50
1 2 regular 70
1 3 regular 80
3 1 supplementary 70
3 2 regular 60
3 3 regular 80
3 4 regular 60
Please help
regards
sanat kumar
thank you sir

user591475 wrote:
Dear Sir,
My table columns are below
rolno,sub_code,exam_type,marks
datas are below
1 1 regular 50
1 1 supplementary 50
1 2 regular 70
1 3 regular 80
2 1 regular 50
2 2 regular 60
2 3 regular 70
2 4 regular 60
3 1 regular 50
3 1 supplementary 70
3 2 regular 60
3 3 regular 80
3 4 regular 60
my query needs to fetch like this if there is equal mark for same sub_code in regular and supplementary it should fetch the supplementary and all the student who have appear for the supplementary
1 1 regular 50
1 1 supplementary 50
1 2 regular 70
1 3 regular 80
3 1 supplementary 70
3 2 regular 60
3 3 regular 80
3 4 regular 60It's not clear what you want. Why are you getting the details of rolno 3 showing, because the rules you describe aren't met.... the supplementary with mark 70 for sub code 1 does not have an equal regular mark of 70 for subcode 1 anywhere in the data.

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Select distinct('more than one column') from ....

Why does this sql statement not work:
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How can I 'select distinct' using more than one column.

Actually, DISTINCT applies to all columns in the result.
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As a matter of fact it doesn't make sense to expect distinct applies to only one column, because you do not specify any criteria on how to select the values for the second column.
A final note: you can do distinct(column1), column2, but this will still apply to both columns!
Here're some examples that will all return both rows from the set, where set is: (1,1), (1,2):
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union all
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Edited by: user4010726 on Dec 1, 2009 11:07 AM

Query help in select Distinct on one column.

CREATE GLOBAL TEMPORARY TABLE Table1 (
ID1 varchar2(100) ,
Name1 varchar2(100),
Name11 varchar2(100)
insert into Table1 values ('a','n1','h3');
insert into Table1 values('b','n2','h2');
insert into Table1 values('a','n3','h1');
insert into Table1 values('c','n4','h5');
insert into Table1 values ('c','n5','h4');
insert into Table1 values('d','n6','h6');
select * from Table1;
ID1,NAME1, NAME11
a, n1, h3
b, n2, h2
a, n3, h1
c, n4, h5
c, n5, h4
d, n6, h6
I am trying to select distinct ID1 and all values associated with it which is max row.I want to result as -
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a, n3, h1
b, n2, h2
c, n5, h4
d, n6, h6
Can you please help me to write simple query to get above result.
Edited by: 871447 on Jul 25, 2011 9:42 AM
Edited by: 871447 on Jul 25, 2011 9:45 AM

Hi,
Do a self-join, to combine the two rows for each value of id1 onto one output row.
Make it an outer join, in case there is only one row with a vlaue for id1.
SELECT l.id1
, l.name1
, NVL ( r.name11
 , l.name11
 ) AS name11
FROM table1 l
LEFT OUTER JOIN table1 r ON l.id1 = r.id1
 AND l.name1 < r.name1
;Edited by: Frank Kulash on Jul 25, 2011 12:57 PM
Sorry, I mis-read the problem.
Lee's solution, above, assumes that name1 is unique, as it is in your sample data.
What output would you want if that's not the case?
If name1 is not unique, but the combination of (id1, name1) is unique, then you can modify Lee's solution like this:
SELECT *
FROM table1
WHERE (id1, name1) IN (
 SELECT id1
 , MAX (name1)
 FROM table1
 GROUP BY id1
;Or, if you can't make any assumptions about uniqueness, you might need something like this:
WITH got_r_num AS
 SELECT id1, name1, name11
 , ROW_NUMBER () OVER ( PARTITION BY id1
 ORDER BY name1 DESC
 , name11 DESC
 ) AS r_num
 FROM table1
SELECT id1, name1, name11
FROM got_r_num
WHERE r_num = 1
;

Select Distinct (More than one column)

Hi All,
I have the following SQL statement written in MySQL that returns only one row per MODCODE with the associated DEPTCODE of AE:
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FROM EL_DEPTLEVEL, EL_MODULE
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However when I attempt to use this in oracle it returns three rows, could somebody point out what it is I need to change to get this working correctly in oracle.
Hope someone can help.
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Duplicates? No way! This query returns unique comibination of
EL_MODULE.DEPTCODE,
EL_MODULE.MODCODE,
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Select sum(distinct column ) from ....

Hello All,
I have a table the contains ID and size.
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Any help would be greatly appreciated.
Thank you
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An ID identifies a unique object, but it can be repeated.Fnord.
I think your data model could withstand some refactoring but what you need to do is:
SELECT sum(size) FROM
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You still ought to check out the concept of UNIQUE constraints though. A database ain't a database without relational integrity.
Cheers, APC

How to select distinct values from a table when it has composite primary ke

Hi
I have the requirement like , I need to select distinct one column values from the table which has composite primary key. How to acheive this functioinality using view object.
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col1 col2 col3
1 A NA
1 B NA
2 A NA
3 C NA
2 D NA
primary key (col1,col2)
I have to select distinct col1.
Thanks

Hi
I got the solution for above. By Creating the read only view object we can acheive this.
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Hi,
I have following task to perform: I am loading metadata into Planning dimension from Oracle database. I have two tables
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Product 1, 15, 500
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Columns:
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Product 1, SampleSoda1
Product 2, SampleSoda2,
Resource 1, CanForSoda,
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I am a little confused how to do it.
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Best regards,
Greg

Hi Greg,
What you can do is either :
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OR
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Hope it helps.
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JeromeFr
Edited by: JeromeFr on Feb 14, 2013 9:52 AM
To be more clear in the first step of solution 1

ORDER BY using a Non-SELECT list column

I need to SELECT DISTINCT values from a column and ORDER it by another column in the same table which is not in the SELECT list. When i got
ORA-01791: not a SELECTed expression error, I tried various things like putting ORDER BY clause in the outer query, using a DISTINCT in the ORDER BY clause,..etc but couldn't succeed.
SQL> create table sample_table (col1 number, col2 number);
Table created.
SQL> select distinct(col1)
2 from sample_table
3 order by col2;
order by col2
ERROR at line 3:
ORA-01791: not a SELECTed expression
SQL> select col1 from
2 (select distinct(col1) col1 from sample_table)
3 order by col2;
order by col2
ERROR at line 3:
ORA-00904: "COL2": invalid identifier
SQL> select distinct(col1) col1 from sample_table
2 order by distinct(col2);
order by distinct(col2)
ERROR at line 2:
ORA-00936: missing expressionAny workarounds for this seemingly simple requirement?

Any workarounds for this seemingly simple requirement?This is not a simple requirement. It is a self contradictory requirement.
You want to order an result on a attribute that you don't have. This is not possible from a logical point of view.
Like saying,
"I want the typical/distinct family size in houses in my town, ordered by house number."

Select distinct is using the wrong index

Hello,
I have an indexes question?
I have a table with 1M rows, the table structure is as follows:
create table X(aTime DATE , a1 NUMBER(28,0), a2 NUMBER(28,0), a3 NUMBER(28,0), .... , a20 NUMBER(28,0) );
I have also 2 indexes:
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- IDX2 is defined on (a1, a2, a3).
I run the following query: "SELECT DISTINCT A1, A2, A3 from X;" and see that the optimizer chooses to do a FTS (full table scan) though I was expecting him to use IDX2 because it looks like a "covering" indexes giving all the answers to the query without fetching data rows.
When I try to force him to use indexes, using the following hint "/*+INDEX(X IDX2)*/" the optimizer chooses IDX1.
When I use same hint after I dropped IDX1 the optimizer still prefers to make FTS .
Some general info:
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- db version 8.1.7.4.
- all tables and indexes are analyzed.
I have two questions:
===============
1.
Why does the optimizer prefers IDX1 (aTime, a1, a2, a3) over IDX2 (a1, a2, a3) when the query specifically requests distinct values of (aTime, a1, a2, a3), isn't there a shortcut the optimizer should use here?
2.
When I request the optimizer to use specific index (using hints), shouldn't it use the index I request regardless of his calculations? If not, is there any way to change this behavior?
Tal Olier
[email protected]

You said you analyzed the tables and indexes. Did you also analyze the indexed columns?
A full table scan may be a better execution plan than using an index, especially if you are selecting the full table.
Remember that a hint is jut that, a hint. It suggests to the optimizer to do something, but the optimizer may still choose a different plan.

Selecting fewer columns from cached results

If I'm reading the docs right, I should be able to create a request with X number of columns to populate the cache, so that a subsequent request that has a direct subset of those columns would hit the cache. That's not what I'm seeing.
I have four fact columns in the RPD. The first three, Sales, Cost, and Units, are coming straight from the Physical Layer. The fourth, Profit, is a subtraction of Sales minus Cost.
Here's what I'm seeing:
1a. Log In to Answers
1b. Create Query: Year, Sales, Cost, Profit - this populates the cache.
1c. Log Out of Answers
1d. Log back in to Answers
1e. Create Query: Year, Sales, Cost - this query does NOT hit that cache entry.
2a. Close all cursors (under Administration...Manage Sessions)
2b. Log Out
2c. Purge Cache
3a. Log In to Answers
3b. Create Query: Year, Sales, Cost, Units - this populates the cache.
3c. Log Out of Answers
3d. Log back in to Answers
3e Create Query: Year, Sales Cost - this query DOES hit the cache entry.
The only difference between the two sequences is that one references a calculated column (Profit) and the other does not.
Incidentally, I've tested this with Profit defined first as a subtraction of the logical columns, and then again as a subtraction of the physical columns, with the same behavior observed both ways.
Can someone please confirm this behavior and suggest a reason why it should occur?

Turribeach, here are the Session Logs for each of the four requests. I've interspersed the steps between double-rows of = signs.
===================================================
===================================================
STEP 1A: Log In
STEP 1B: Create request - Year, Sales, Cost, Profit
===================================================
===================================================
+++Analyst:320000:320001:----2009/01/15 09:13:51
-------------------- Logical Request (before navigation):
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Times.Year as c1 GB,
Sales:[DAggr(~Base Facts.Sales by [ Times.Year, Times.Year End Date] )] as c2 GB,
Cost:[DAggr(~Base Facts.Cost by [ Times.Year, Times.Year End Date] )] as c3 GB,
Sales:[DAggr(~Base Facts.Sales by [ Times.Year, Times.Year End Date] )] - Cost:[DAggr(~Base Facts.Cost by [ Times.Year, Times.Year End Date] )] as c4 GB,
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-------------------- Sending query to database named BIEE_TRAIN (id: <<1690>>):
WITH
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sum(round(T68.SALES , 2)) as c2,
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T61.YEAR_END_DATE as c4
from
GLOBAL_ADMIN.BI_D_TIME T61,
GLOBAL_ADMIN.BI_F_SALES T68
where ( T61.MONTH = T68.MONTH )
group by T61.YEAR, T61.YEAR_END_DATE)
select distinct SAWITH0.c3 as c1,
SAWITH0.c2 as c2,
SAWITH0.c1 as c3,
SAWITH0.c2 - SAWITH0.c1 as c4,
SAWITH0.c4 as c5
from
SAWITH0
order by c5
+++Analyst:320000:320001:----2009/01/15 09:13:52
-------------------- Query Result Cache: [59124] The query for user 'Analyst' was inserted into the query result cache. The filename is 'C:\OracleBIData\cache\NQS_TRAINING_733424_33231_00000000.TBL'.
===================================================
===================================================
STEP 1C: LOG OUT
STEP 1D: LOG IN
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===================================================
===================================================
+++Analyst:330000:330001:----2009/01/15 09:17:41
-------------------- Logical Request (before navigation):
RqList
Times.Year as c1 GB,
Sales:[DAggr(~Base Facts.Sales by [ Times.Year, Times.Year End Date] )] as c2 GB,
Cost:[DAggr(~Base Facts.Cost by [ Times.Year, Times.Year End Date] )] as c3 GB,
Times.Year End Date as c4 GB
OrderBy: c4 asc
+++Analyst:330000:330001:----2009/01/15 09:17:41
-------------------- Sending query to database named BIEE_TRAIN (id: <<2062>>):
select T61.YEAR as c1,
sum(round(T68.SALES , 2)) as c2,
sum(round(T68.COST , 2)) as c3,
T61.YEAR_END_DATE as c4
from
GLOBAL_ADMIN.BI_D_TIME T61,
GLOBAL_ADMIN.BI_F_SALES T68
where ( T61.MONTH = T68.MONTH )
group by T61.YEAR, T61.YEAR_END_DATE
order by c4
+++Analyst:330000:330001:----2009/01/15 09:17:41
-------------------- Query Result Cache: [59124] The query for user 'Analyst' was inserted into the query result cache. The filename is 'C:\OracleBIData\cache\NQS_TRAINING_733424_33461_00000001.TBL'.
*** Note: At this point, there are indeed TWO entries in the cache. ***
===================================================
===================================================
STEP 2A: Close all cursors
STEP 2B: Log Out
STEP 2C: Purge the cache
STEP 3B: Create request - Year, Sales, Cost, Units
===================================================
===================================================
+++Analyst:350000:350001:----2009/01/15 09:23:18
-------------------- Logical Request (before navigation):
RqList
Times.Year as c1 GB,
Sales:[DAggr(~Base Facts.Sales by [ Times.Year, Times.Year End Date] )] as c2 GB,
Cost:[DAggr(~Base Facts.Cost by [ Times.Year, Times.Year End Date] )] as c3 GB,
Units:[DAggr(~Base Facts.Units by [ Times.Year, Times.Year End Date] )] as c4 GB,
Times.Year End Date as c5 GB
OrderBy: c5 asc
+++Analyst:350000:350001:----2009/01/15 09:23:18
-------------------- Sending query to database named BIEE_TRAIN (id: <<2399>>):
select T61.YEAR as c1,
sum(round(T68.SALES , 2)) as c2,
sum(round(T68.COST , 2)) as c3,
sum(round(T68.UNITS , 0)) as c4,
T61.YEAR_END_DATE as c5
from
GLOBAL_ADMIN.BI_D_TIME T61,
GLOBAL_ADMIN.BI_F_SALES T68
where ( T61.MONTH = T68.MONTH )
group by T61.YEAR, T61.YEAR_END_DATE
order by c5
+++Analyst:350000:350001:----2009/01/15 09:23:19
-------------------- Query Result Cache: [59124] The query for user 'Analyst' was inserted into the query result cache. The filename is 'C:\OracleBIData\cache\NQS_TRAINING_733424_33798_00000002.TBL'.
===================================================
===================================================
STEP 3C: LOG OUT
STEP 3D: LOG IN
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===================================================
===================================================
+++Analyst:360000:360001:----2009/01/15 09:24:36
-------------------- Logical Request (before navigation):
RqList
Times.Year as c1 GB,
Sales:[DAggr(~Base Facts.Sales by [ Times.Year, Times.Year End Date] )] as c2 GB,
Cost:[DAggr(~Base Facts.Cost by [ Times.Year, Times.Year End Date] )] as c3 GB,
Times.Year End Date as c4 GB
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+++Analyst:360000:360001:----2009/01/15 09:24:36
-------------------- Cache Hit on query:
Matching Query: SET VARIABLE QUERY_SRC_CD='Report';SELECT "Time Dimension"."Year" saw_0, "Base Measures".Sales saw_1, "Base Measures".Cost saw_2, "Base Measures".Units saw_3 FROM Global ORDER BY saw_0
Created by: Analyst
+++Analyst:360000:360001:----2009/01/15 09:24:36
-------------------- Query Status: Successful Completion
+++Analyst:360000:360001:----2009/01/15 09:24:36
*** Note: At this point, there is ONE entry in the cache. ***

Count a distinct column value in an interactive report

Hi,
I'm struggling with this and would appreciate any pointers.
I have built a view here:
http://apex.oracle.com/pls/otn/f?p=11189:1
The report can have duplicate column values. I'm tying to find a way using the interactive report functionality (i.e. without modifying the underlying SQL) to count a distinct column value. For example, in the example following the link I'd like to be able to count the unique customer_ids and return 7.
This may be fundametally impossible depending on the way the SQL is generated for the interactive reports. If this is the case can anyone confirm this?
Many thanks
Yog.

"Not modifying views is fair enough. But not wrapping a SELECT around them? Really? Why? And as I said, that's imposible, the IR already does it."
This is not a problem. However for the IR's it's a development decision to keep all reported columns ( and analysis on these columns ) as a seperate development process to be controlled centrally by a seperate team. The point to remember is that the app looks at hundereds of views and it was decided that modifying each report to fit each instance would become cumbersome to manage and to put it simply there are not the resources to do it.
again, I'm not here to justify any of that!
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No just the Reports. It is a very very simple app; a big list an a page for each report.
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I agree, and that should include select * from view.
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Some users will want to see some data from the view and other users will want to see other data, Over the whole user base someone somewhere will want to see all of it.
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Hello.
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PROCEDURE sp_execute_dynamic (hold_input_string IN CLOB,
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OPEN hold_cursor FOR TO_CHAR(hold_input_string);
END sp_execute_dynamic;
It works fine except when I perform SELECT DISTINCT. I get the following error.
SQL> declare
2 TYPE hold_cursor_type IS REF CURSOR;
3 hold_cursor hold_cursor_type;
4 hold_object_name VARCHAR2(1024);
5 hold_object_type VARCHAR2(1024);
6 begin
7 dynamic_sql_pkg.sp_execute_dynamic('select distinct object_name from user_objects where object_
name in (''PLAN_TABLE'',''DBA_OBJECTS'')',hold_cursor);
8 loop
9 fetch hold_cursor into hold_object_name, hold_object_type;
10 exit when hold_cursor%NOTFOUND;
11 dbms_output.put_line('Object Name = '||hold_object_name||' Object Type = '||hold_object_type);
12 end loop;
13 end;
14 /
declare
ERROR at line 1:
ORA-01007: variable not in select list
ORA-06512: at line 9
It does the same thing with SELECT UNIQUE or SELECT with a GROUP BY. Can anyone tell me why this happens and what I could to to work around it?
Thanks
Chris

see at line 7 you are selecting only one column and at line 9you are fetching into two variables
7 dynamic_sql_pkg.sp_execute_dynamic('select distinct object_name from user_objects where object_
name in (''PLAN_TABLE'',''DBA_OBJECTS'')',hold_cursor);
8 loop
9 fetch hold_cursor into hold_object_name, hold_object_type;
HTH

Select distinct column

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