Getting Top-N Query To Work As Sub-select In Larger Query?
Mar 10, 2012
Is there a technique to getting a Top-N query to work as a sub-select in a larger query -or- is there another way to generate Top-N like results that works as a sub-select?
Background:
We have a large query that is being used to build an export from a legacy HR system to a new one. Amount the data needed in the export is the employees primary phone number.
The legacy HR system allows multiple phone numbers to be stored in a simple table structure:
SELECT emp_id, phone_type, phone_number
FROM employee_phones
The new HR system does allow for multiple phone numbers, however they need a primary phone number identified and stored with the employee master information. (Subsequent phone numbers get stored in alternate table.)
From a business perspective, we have decided that if they have a HOME phone in the legacy system that should be the primary in the new system, if no HOME phone, then WORK, if no WORK then CELL.
That can be represented as:
SELECT *
FROM employee_people_phones
WHERE emp_id = '46021'
ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')
SELECT *
FROM (SELECT *
FROM employee_people_phones
WHERE emp_id = '46021'
ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')) results
WHERE ROWNUM = 1
SELECT phone_number
FROM (SELECT phone_number
FROM employee_people_phones
WHERE emp_id = '46021'
ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')) results
WHERE ROWNUM = 1
phone_number
-------------------
1111111111
However, when the Top-N query is added as a sub-select in a larger query using the employee id from the larger query (WHERE emp_id = export.emp_id), it fails saying that �export.emp_id� is not a valid id.
(SELECT phone_number
FROM (SELECT phone_number
FROM employee_people_phones
WHERE emp_id = export.emp_id
ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')) results
WHERE ROWNUM = 1)
1.Any way around this? Is it possible to put a Top-N (with a WHERE clause using data from the main query) in a sub-select?
2.Any alternatives (other than Top-N) to delivering a ROWNUM=1 result with a �custom� ORDER BY statement?
Other Notes: Yes, we know we could do two queries in the data conversion first deliver the bulk data to the target table, and then update with the phone numbers. However, for multiple reasons, that is less than desirable.
I have created a custom form. I have field called Order No. When i query on Order no.. i should be able to pick order no as well as other fields related to it. how do i acheive this functionality. I mean the f11 and ctrl f11 querying functionality.
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My problem is that the radio buttons cannot be changed in ENTER-QUERY mode. If they cancel the query, the buttons work as expected. I put in a couple messages and the trigger isn't even firing, so I ruled out a code problem I think.I checked to make sure that the group properties are Enabled=true, mouse_navigable=true, query_allowed=true.
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I checked the plan for the 2 schemas and I see that the plan is different.
Here is the query: SELECT ccc.ComponentId AS "ComponentId", ccp.Code AS "ParentCode", ccc.Code AS "ChildCode" FROM CatalogueComponent ccp INNER JOIN CatalogueComponent ccc ON ccp.ComponentId = ccc.ParentComponentId WHERE ccc.ComponentId IN (20934777, 1594747)
I'm sending also the 2 output of PLAN results from 2 different schemas.
what should I do to fix the problem with the NAFBCA schema.
SELECT DISTINCT PATIENT_ID , ( SELECT ROWNUM,APPOINTMENT_ID FROM AppointmentDetailsHistory WHERE APPOINTMENT_STATUS_ID = 2 AND VISIT_TYPE_ID NOT IN (7) AND PATIENT_ID = ADH.PATIENT_ID
[code]...
MY SELECT query failing actually i am trying to convert sql server select into oracle.My sql server query is like this.
SELECT DISTINCT PATIENT_ID , ( SELECT TOP 1 APPOINTMENT_ID FROM EMRAppointmentDetailsHistory WHERE APPOINTMENT_STATUS_ID = 2 AND VISIT_TYPE_ID NOT IN (7) AND PATIENT_ID = ADH.PATIENT_ID ORDER BY PATIENT_ID, LAST_UPDATED_DATE ASC) AS FIRST_APPOINTMENT FROM EMRAppointmentDetailsHistory ADH WHERE ADH.APPOINTMENT_STATUS_ID = 2 AND ADH.VISIT_TYPE_ID NOT IN (7)
We're using Oracle 10g for development purposes.I have 2 same schemas with approximately same data.I'm running same query on 2 schemas and I see that the first schema runs the query around 20sec and the 2.schema less than 1 sec. I thoughtfirst that there may be missing constraints or indexes but all are the same.I checked the plan for the 2 schemas and I see that the plan is different.
Here is the query: SELECT ccc.ComponentId AS "ComponentId", ccp.Code AS "ParentCode", ccc.Code AS "ChildCode" FROM CatalogueComponent ccp INNER JOIN CatalogueComponent ccc ON ccp.ComponentId = ccc.ParentComponentId WHERE ccc.ComponentId IN (20934777, 1594747)
I'm sending also the 2 output of PLAN results from 2 different schemas.
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--insert into t1(col1, col2, flag) values(1, 'a', 'Y'); --insert into t1(col1, col2, flag) values(2, 'b', 'N');
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When remove NVL function or change the condition by having AND NVL(SELECT) =0 the query working fine.
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INSERT INTO A SELECT b.name name, a.address address,
[Code]....
so the query works on Prod but fails on Dev because column order is different.
I have 2 solutions:
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so tomorrow On prod column order and on Dev column order is different though my sql should successfully execute.
i have a good query but I thought i know the solution but actually I didn't it's very simple and straight forward but i didn't catch the rope terminal to follow now I have the following code
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but if i passed languages like 'Italy' and 'Dutch' it should not return any thing (just : no rows selected)
He had created an object type and wanted to populate it in a query. So far so good. But then he wanted to select some attributes from that object in the same query. Basically, he wanted to do something like this:
With his_view As ( select object_type( attr1, attr2) theobj From his_table Where ... ) Select theobj.attr1 From his_view
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Create type mhe_type As Object( col1 Number , col2 Varchar2(30) ) / -- Basic select With mhe_view [code]...
Specify a correlation name, which is alias for the table, view, materialized view, or subquery for evaluating the query. This alias is required if the select list references any object type attributes or object type methods. link...
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i tried to use the partition technique. using partition solved the problem apperently. the sum function worked but redundancy in "segment1" column still persists. i used the sum function only to extract the distinct "segment1" column and summing its corresponding "quantity" column (only quantity column differs in the redundant rows...)
the second query was like:
SELECT prha.segment1, prha.creation_date, SUM(prla.quantity) OVER(PARTITION BY prha.segment1) AS qty, prha.DESCRIPTION,
A B ---------------------- 2*3 2*4*5 4*5 column B contain no data.
I want to create a function which can be used in a select query,and the output should come like that :-
A B ---------------------- 2*3 6 2*4*5 40 4*5 20
Means column B contains the resultant value of column A.And the above output should come through a select statement.You can use any function inside the select statement.
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select * from some_table st, other_table ot where st.id = ot.id
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SELECT CASE WHEN currentstep.step_id IN (100) THEN currentstep.start_date ELSE (SELECT start_date FROM audt.os_historystep WHERE ID =
[code].....
here is the completed query
select EAG.AUDIT_NUMBER Audit_Nbr, ( SELECT CASE WHEN currentstep.step_id IN (100) THEN currentstep.start_date ELSE (SELECT start_date FROM audt.os_historystep
[code].....
when I try select from this query I get ORA-00904: "DATE1": invalid identifier.
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For instance.
DECLARE MHBulk CURSOR FOR select invoice_nbr, customer_nbr, post_century, post_yymmdd, from CUSTOMERS where customer_nbr = 1234 order by post_century, post_yymmdd;
If you have more than one occurrence of the same customer_nbr, post_century, and post_yymmdd
it looks like the default order for how 11g retrieves the records is a bit different than the 10g default.
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In a select query, I want to substitute the column name from a variable (In turn from an array of column names). Details are given below. I am getting an error as mentioned below.
Insert Into Test1 values(10,'Thomas','Manager','LA'); Insert Into Test1 values(11,'George','Chairman','LA');
declare MTest1Test1%RowType; str1VarChar2(1000):='Name'; MValue1Varchar2(100); begin Select * Into MTest1 from Test1 where ID=10; str1:='Select MTest1.'||str1||' from dual'; execute immediate str1 into mvalue1; dbms_output.put_line('mvalue1 '||mvalue1); end; /
I am getting the error:
ORA-00904: "MTEST1"."NAME": invalid identifier ORA-06512: at line 9