Why would this query return three rows?
select pc.tour_id,
pcp.project_id,
pc.contr_num,
pc.current_contr_status,
pc.current_contr_substat
from p_contract_lead pcl
left join p_contract pc on pc.contr_num = '2385108'--pcl.contr_num
left join p_contract_purchase pcp on pcp.contr_num ='2385108'-- pc.contr_num
where pcl.lead_id = '179772978'
in this query it returns me 3 rows,
in p_contract there is only 1 row with contr_num = '2385108'
and p_contract_purchase also has 1 row with contr_num = '2385108'
in p_contract_lead the lead_id = '179772978' has 3 records but they dont have contr_num=2385108
im just wondering why is giving me these results?
shouldnt it give me zero results since the pcl.lead_id = '179772978' does not equal contr_num=2385108?
i have version 12.0.0.6, maybe is the way i dont understand the left join works, or could be something else?
sorry for not creating a example , because i really dont know how.
thanks for your help
Hi,
FROM l
LEFT OUTER JOIN r ON ...
means include all rows from l whether or not they have a match in r.
If you have 3 rows in l, then there will always be at least 3 rows in the result set, regardless of what's in r (if anything).
natpidgeon wrote:
in p_contract there is only 1 row with contr_num = '2385108'
and p_contract_purchase also has 1 row with contr_num = '2385108'
in p_contract_lead the lead_id = '179772978' has 3 records but they dont have contr_num=2385108
im just wondering why is giving me these results?
shouldnt it give me zero results since the pcl.lead_id = '179772978' does not equal contr_num=2385108? ...
What you just described is basically how an inner join works.
In this case, it doesn't matter in the least whether pcl.lead_id equals anything in pc or not. The join condition between pcl and pc is
pc.contr_num = '2385108'
That is, a row from pcl will match a row in pc if (and only if) pc.contr_num='2385108'. The join condition makes no mention of pcl.lead_id (or any other column in pcl, for that matter), so what's in pcl.lead_id (or any other column of pcl) doesn't play any role in deciding if rows match.
sorry for not creating a example , because i really dont know how.
Post CREATE TABLE statements for all 3 tables. You only need to include the columns that are used in this query.
Post 1 INSERT statement for p_contract, with contr_num = '2385108'. It wouldn't hurt to post an additional row that you know shouldn't appear in the results.
Post 1 INSERT statement for p_contract_purchase, also with contr_num = '2385108'. Again, it wouldn't hurt to post a 2nd row that does not meet the join condition.
Post 3 INSERT statements p_contract_lead with lead_id = '179772978' , but NOT contr_num='2385108'. Again, having another row with a different lead_id would make a better example.
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Why would this query return an error that mentions an entirely different database being offline?
Trying to get a list of fragmented indexes based on a database name. However,
SELECT COUNT(*) AS TableFragOver80PctCount
FROM sys.dm_db_index_physical_stats (null, null, null, null, null )as ts
INNER JOIN sys.tables t on t.[object_id] = ts.[object_id]
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The error I get back
Msg 942, Level 14, State 4, Line 1
Database 'VERY DIFFERENT DB' cannot be opened because it is offline.
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See MSDN sys.dm_db_index_physical_stats
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Olaf Helper
[ Blog] [ Xing] [ MVP] -
Silly old fogey (me) cannot figure out why this query returns 1 row
Hi all,
In reference to {thread:id=2456973}, why does
select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
, sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
from emp group by job;only return 1 row and not 1 for each job? I actually had to test it myself to believe it.
It returns data as if the query were
select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
from emp group by job)Using only a single aggregate (either count or sum) returns 1 row per job, as expectedJohn Stegeman wrote:
It returns data as if the query were
select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
from emp group by job)
Exactly the point ;-)
Seems like Oracle actually can do a "double group by" in the same operation.
Witness the explain plans in this example:
SQL> select count(decode(job, 'CLERK', 1, null)) CLERKS
2 , count(decode(job, 'SALESMAN', 1, null)) SALESMANS
3 from scott.emp group by job;
CLERKS SALESMANS
0 0
0 0
0 0
0 4
4 0
Execution Plan
Plan hash value: 1697595674
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 5 | 40 | 4 (25)| 00:00:01 |
| 1 | HASH GROUP BY | | 5 | 40 | 4 (25)| 00:00:01 |
| 2 | TABLE ACCESS FULL| EMP | 14 | 112 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------And compare it to this one with the double aggregates:
SQL> select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
2 , sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
3 from scott.emp group by job;
CLERKS SALESMANS
4 4
Execution Plan
Plan hash value: 417468012
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 8 | 4 (25)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 8 | 4 (25)| 00:00:01 |
| 2 | HASH GROUP BY | | 1 | 8 | 4 (25)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP | 14 | 112 | 3 (0)| 00:00:01 |
----------------------------------------------------------------------------There is both HASH GROUP BY and SORT AGGREGATE.
It does not really make sense to do an aggregate on an aggregate - if both aggregates are used "on the same group-by level".
The sum() aggregates are used upon an already aggregated value, so it does look like Oracle actually treats that as "first do the inner aggregate using the specified group by and then do the outer aggregate on the result with no group by."
Look at this example where I combine "double" aggregates with "single" aggregates:
SQL> select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
2 , sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
3 , count(decode(job, 'SALESMAN', 1, null)) SALESMANS2
4 , count(*) COUNTS
5 from scott.emp group by job;
CLERKS SALESMANS SALESMANS2 COUNTS
4 4 1 5
Execution Plan
Plan hash value: 417468012
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 8 | 4 (25)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 8 | 4 (25)| 00:00:01 |
| 2 | HASH GROUP BY | | 1 | 8 | 4 (25)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP | 14 | 112 | 3 (0)| 00:00:01 |
----------------------------------------------------------------------------When mixing "double" and "single" aggregates, Oracle decides that single aggregates belong in the "outer" aggregation.
SALESMAN2 is doing a count on the aggregated job column that is the result of the "inner" group by - therefore only 1.
The count(*) also counts the result of the "inner" aggregation.
I am not sure if this is documented or if it is a "sideeffect" of either the internal code used for GROUPING SETS or the internal code used for allowing analytic functions like this:
SQL> select count(decode(job, 'CLERK', 1, null)) CLERKS
2 , count(decode(job, 'SALESMAN', 1, null)) SALESMANS
3 , sum(count(decode(job, 'CLERK', 1, null))) over () CLERKS2
4 , sum(count(decode(job, 'SALESMAN', 1, null))) over () SALESMANS2
5 from scott.emp group by job;
CLERKS SALESMANS CLERKS2 SALESMANS2
0 0 4 4
4 0 4 4
0 0 4 4
0 0 4 4
0 4 4 4
Execution Plan
Plan hash value: 4115955660
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 5 | 40 | 4 (25)| 00:00:01 |
| 1 | WINDOW BUFFER | | 5 | 40 | 4 (25)| 00:00:01 |
| 2 | SORT GROUP BY | | 5 | 40 | 4 (25)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP | 14 | 112 | 3 (0)| 00:00:01 |
----------------------------------------------------------------------------Personally I think I would have preferred if Oracle raised an error on this "double aggregation" and thus require me to write it this way (if that is the result I desired):
select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
from emp group by job)I can not really think of good use-cases for the "double aggregation" - but rather that it could give you unnoticed bugs in your code if you happen to do double aggregation without noticing it.
Interesting thing to know ;-) -
I need that this query return only one value
Hi, please. I need your help. I have this query:
SELECT c.charvalue "Comentario", max(pi.id) as "id" --into :gcpe_last_comment
FROM twflprocessinstances pi, twfliprocessparameters c
WHERE pi.id = c.iprocess_id
AND c.param_id = 1002286
AND c.charvalue IS NOT NULL
AND pi.processdef_id = 1600
AND to_number(pi.id) <> 3817940
AND to_number(pi.seeparameter1) =80137377
group by c.charvalue
having max(pi.id)
This query return 3 rows, but I need that this query return only one row. The row that this query should return is the row before at the max id. ThanksMmmm...I don't get it.
You might need to post some sample data and expected results. -
Why is this query not using the index?
check out this query:-
SELECT CUST_PO_NUMBER, HEADER_ID, ORDER_TYPE, PO_DATE
FROM TABLE1
WHERE STATUS = 'N'
and here's the explain plan:-
1
2 -------------------------------------------------------------------------------------
3 | Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
4 -------------------------------------------------------------------------------------
5 | 0 | SELECT STATEMENT | | 2735K| 140M| 81036 (2)|
6 |* 1 | TABLE ACCESS FULL| TABLE1 | 2735K| 140M| 81036 (2)|
7 -------------------------------------------------------------------------------------
8
9 Predicate Information (identified by operation id):
10 ---------------------------------------------------
11
12 1 - filter("STATUS"='N')
There is already an index on this column, as is shown below:-
INDEX_NAME INDEX_TYPE UNIQUENESS TABLE_NAME COLUMN_NAME COLUMN_POSITION
1 TABLE1_IDX2 NORMAL NONUNIQUE TABLE1 STATUS 1
2 TABLE1_IDX NORMAL NONUNIQUE TABLE1 HEADER_ID 1
So why is this query not using the index on the 'STATUS' Column?
I've already tried using optimizer hints and regathering the stats on the table, but the execution plan still remains the same, i.e. it still uses a FTS.
I have tried this command also:-
exec dbms_stats.gather_table_stats('GECS','GEPS_CS_SALES_ORDER_HEADER',method_opt=>'for all indexed columns size auto',cascade=>true,degree=>4);
inspite of this, the query is still using a full table scan.
The table has around 55 Lakh records, across 60 columns. And because of the FTS, the query is taking a long time to execute. How do i make it use the index?
Please help.
Edited by: user10047779 on Mar 16, 2010 6:55 AMIf the cardinality is really as skewed as that, you may want to look at putting a histogram on the column (sounds like it would be in order, and that you don't have one).
create table skewed_a_lot
as
select
case when mod(level, 1000) = 0 then 'N' else 'Y' end as Flag,
level as col1
from dual connect by level <= 1000000;
create index skewed_a_lot_i01 on skewed_a_lot (flag);
exec dbms_stats.gather_table_stats(user, 'SKEWED_A_LOT', cascade => true, method_opt => 'for all indexed columns size auto');Is an example. -
XML attributes makes my query return no rows
Hello everyone,
I've an odd problem.
I'm querying some XML, but the attributes in one of the tags make my query return no rows; if I remove the attributes, then the query works as expected.
The XML is below; it's the attributes in the Report tag that cause the issues:
<result errorCode="0">
<return>
<Report
xsi:schemaLocation="Items_x0020_status_x0020_information http://******-****/ReportServer?%2FReports%2FContent%20Producer%20Reports%2FItems%20status%20information&rs%3AFormat=xml&rc%3ASchema=True"
Name="Items status information" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="Items_x0020_status_x0020_information">
<Tablix1>
<Details_Collection>
<Details ItemId="914P7" Username="test" user_role="IT"
first_name="Barry" last_name="Donovan" organisation=""
content_format="On_Screen" modified_date="26/05/2011 13:16:49"
item_status="Draft" status_date="" component_name="" demand="" />
</Details_Collection>
</Tablix1>
</Report>
</return>
</result>My query is:
select
a.item_id
,a.username
,a.user_role
,a.first_name
,a.last_name
,a.supplier_id
,a.format
,a.modified_date
,a.item_status
,a.completion_date
,a.component_code
from dual
,xmltable
('/result/return/Report/Tablix1/Details_Collection/Details'
passing p_xml
columns
item_id varchar2(1000) path '@ItemId'
,username varchar2(1000) path '@Username'
,user_role varchar2(1000) path '@user_role'
,first_name varchar2(1000) path '@first_name'
,last_name varchar2(1000) path '@last_name'
,supplier_id varchar2(1000) path '@organisation'
,format varchar2(1000) path '@content_format'
,modified_date varchar2(1000) path '@modified_date'
,item_status varchar2(1000) path '@item_status'
,completion_date varchar2(1000) path '@status_date'
,component_code varchar2(1000) path '@demand'
) a;I've tried stripping out the attributes in the tag, which does work, but some of the XML I'm expecting back may be quite large (many records), so that caused issues in itself. I'd rather deal with it and not mess with the XML itself if possible.
Any help would be hugely appreciated!
Thank you very much in advance.
Robin
Edited by: User_resU on Apr 12, 2012 2:50 PMExample:
SQL> ed
Wrote file afiedt.buf
1 with t as (select xmltype('<result errorCode="0">
2 <return>
3 <Report
4 xsi:schemaLocation="Items_x0020_status_x0020_information http://******-****/ReportServer?%2FReports%2FContent%20Producer%20Reports%2FItems%20status%20information&rs%3AFormat=xml&rc%3ASchema=True"
5 Name="Items status information" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
6 xmlns="Items_x0020_status_x0020_information">
7 <Tablix1>
8 <Details_Collection>
9 <Details ItemId="914P7" Username="test" user_role="IT"
10 first_name="Barry" last_name="Donovan" organisation=""
11 content_format="On_Screen" modified_date="26/05/2011 13:16:49"
12 item_status="Draft" status_date="" component_name="" demand="" />
13 </Details_Collection>
14 </Tablix1>
15 </Report>
16 </return>
17 </result>') as xml from dual)
18 --
19 -- end of test data
20 --
21 select
22 a.item_id
23 ,a.username
24 ,a.user_role
25 ,a.first_name
26 ,a.last_name
27 ,a.supplier_id
28 ,a.format
29 ,a.modified_date
30 ,a.item_status
31 ,a.completion_date
32 ,a.component_code
33 from t
34 ,xmltable
35 (xmlnamespaces('Items_x0020_status_x0020_information' as "x0"),
36 '//x0:Report/x0:Tablix1/x0:Details_Collection/x0:Details'
37 passing xml
38 columns
39 item_id varchar2(1000) path '@ItemId'
40 ,username varchar2(1000) path '@Username'
41 ,user_role varchar2(1000) path '@user_role'
42 ,first_name varchar2(1000) path '@first_name'
43 ,last_name varchar2(1000) path '@last_name'
44 ,supplier_id varchar2(1000) path '@organisation'
45 ,format varchar2(1000) path '@content_format'
46 ,modified_date varchar2(1000) path '@modified_date'
47 ,item_status varchar2(1000) path '@item_status'
48 ,completion_date varchar2(1000) path '@status_date'
49 ,component_code varchar2(1000) path '@demand'
50* ) a
SQL> /
ITEM_ID
USERNAME
USER_ROLE
FIRST_NAME
LAST_NAME
SUPPLIER_ID
FORMAT
MODIFIED_DATE
ITEM_STATUS
COMPLETION_DATE
COMPONENT_CODE
914P7
test
IT
Barry
Donovan
On_Screen
26/05/2011 13:16:49
Draft -
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shloimypt wrote:
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