I am working on this assignment question for class:
Write a SELECT statement that returns a single value that represents the sum of the largest unpaid invoices for each vendor (just one for each vendor). Use an inline view that returns MAX(invoice_total) grouped by vendor_id, filtering for invoices with a balance due
What I have coded so far is below
SELECT i.vendor_id,
To_char(SUM(invoice_total), '$9,999,999.99') AS sum_invoice_total
FROM invoices i
join (SELECT vendor_id,
[code]...
I am getting some results which I have attached. I'm not sure if I'm capturing the "largest unpaid invoices for each vendor" part of the question. Yielding to the knowledge the group and trying to use the proper posting etiquette. I have attached my output screen as well.
the execution steps of inline view?importance&advantage of inline view?.Also reference link where i can get more information about inline view(i.e. basics to advanced),exercises and interview questions.
there is a diff. problem for me.when i create table through inline view then it shows 2246 records but if i check these records only in select statement then it shows 124 records. i cant understand how table shows 2246 records even then atual records in inline view shows only 124 records.
following is a query
create table sam as select * from (( select distinct stck.item_code from ( select item_code,bal
I am working on Oracle 10g and Below is my query which is taking 30min. to execute. I am using two inline view and then make joins on these inline view because of i think it Degrade Performance.
(select * from surveys s join answers a on s.survey_id = a.survey_seq_id where month = 201212 and qa = 1 and main_group_id = 55) a, (select * from surveys s join answers a on s.survey_id = a.survey_seq_id where month = 201212 and qa = 1 and main_group_id = 3) b where a.survey_id = b.survey_id and substr(a.question_uid , 3) = substr(b.question_uid, 2))
set b.answer = a.answer;
My second question is: The following query is giving error. What can I do?
update answers ans set (ans.answer) = (with a as (select * from surveys s join answers a on s.survey_id = a.survey_seq_id where month = 201212 and qa = 1 and main_group_id = 55), b as (select * from surveys s join answers a on s.survey_id = a.survey_seq_id where month = 201212 and qa = 1 and main_group_id = 3) select a.answer from a join b on a.survey_id = b.survey_id and substr(a.question_uid , 3) = substr(b.question_uid, 2) and b.answer_id = ans.answer_id) where ans.main_group_id = 3;
Attached query is running fine if inline view B (Marked in Comments) returning value. If inline view B returns NULL then it fails to return result. I want if Inline view B is returning NULL then it should pass ZERO to main query.
we're having a few tables which queries about 10.000 articles. As we don't show them all at once we are using pagination and use the rownum to show only a limited number of the results.
Now as these queries are pretty complex we have to optimize them and since we use pagination we have to call our query twice (first we make a count(*) and then we call the small resultset of a few rows). Ofcourse we are looking for a solution to call it only once and still use the pagination. We could load the whole resultset of 10.000 results and let java show only a few but that makes our line between the oracle and webserver pretty heavy. Is there a way to call the total number of results and give back only a small resultset just in one query?
how joins work with in-line views.I have a query and its explain plan as below:
SELECT e.ename,e.deptno,d.dname FROM dept d, emp e WHERE e.deptno=d.deptno AND e.deptno=20 [code]....
I do not find any difference in both the explain plans. Both are same. In my second query, the filtered rows will be joined to dept table. And hence the baggage will reduce.But how can I verify that in-line view has worked better?
I have been using With for many queries for readability. This most recent query seemed to be taking a bit longer to run and I didn't think much of it until a colleague showed me their version (totally different sql statement) which ran faster, but seemed more complicated and had more lines of code. I noticed that the other version did not use with. I moved the sql of the with into the join and the query ran faster dropping from 30 seconds to 798 msecs. The question is am I sacrificing speed for readability by using With, or it really depends on the overall sql statement.
Here is the query using WITH:
with prev as ( select person_uid, id, name, academic_period, case when enrolled_ind = 'Y' and registered_ind = 'N' and student_status = 'AS' then 0 else 1 end as enreg_stat,
I have created a few flash charts using APEX4.2. Is there a way for the user to view the chart and then email it as an inline image to someone? I know that the user can save the chart as PDF file, then send it as an attachment via Outlook ( or similar system), but can I integrate these manual steps to one ( template), similar to the IR report's download feature ?
I'm trying to create a Materialized View on a remote database from a simple view. The reason is, the data owners don't want to grant explicit tables privileges to external subscribers.
A new schema is created to publish data in the form of a view. I've created mlogs on the master tables, and granted them to the subscriber, but it's still complaining about a missing primary key on the view. A primary key does exist in the master table.
Is there another work around for this situation without having to work inside the data sources' environment?
We wrote one data load process to load GZ files into Database.during process we will change client facing view definitions to backup table so that we can work on base tables.
This view definition changes are related to FROM and WHERE clause (not columns/type). during load process, client/user may connect to current server and accessing these views. My question is what will be the reflection of changing view definition while user is accessing view?
I created a scenario- STEP1: Created a view- create or replace view view_01 as select object_name from dba_objects union all select object_name from dba_objects union all select object_name from dba_objects union all [code]....
View definition is replaced by new definition while select is executing on that view. select returned number of records as per view definition one.
I have a materialized view "pro_mview",I am trying to refresh the MVIEW by using the following statement.
EXEC DBMS_MVIEW.REFRESH('pro_mview','C');
But I am getting the below error.
* Error at line 1: ORA-12008: error in materialized view refresh path ORA-00942: table or view does not exist ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2256 ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2462 ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2431 ORA-06512: at line 1
I am able to fetch the data from that materialized view(pro_mview).
what would be the difference between a view and a materialized view? whether DML possible on a view? i think error occurs if DML tried on a view which is a combination of two or more tables, whether DML possible on a materialized view?
I am using some UPS shipping software that imports shipping information based on an order number that the user enters and we are having performance problems. In the software's configuration you choose one database object (namely a table or view) to get the information from. I have created myView that selects from multiple tables, lookup tables, etc. I must use a view because the software only has the ability to add a " and <importKeyThatIHaveDefined> = <valueEnteredByUser>". For instance " and order_number = 123". It cannot join multiple tables, etc. The address_field1 info is the same for each record with the same order_number so I can just get the first row (or any row with order_number = <enteredOrderNumber> for that matter).
When I first looked at this it was created as something like this:
select order_number, line_number, order_number || '' || line_number as ol, address_field1 from order;Keep in mind that there are more than just this table and more fields selected. They are all joined correctly (for lookup values etc.).
The concatenation was determined to be the bottleneck in performance. ol was defined as the import key to be used and the users were just entering the order number plus a 1 to get ONLY the first line number. Each order (usually) has more than one line and even the line number is not necessarily unique for each order. For instance, order 123 may have line 1 twice and line 2 once.
select order_number, line_number, address_field1 from order where rownum = 1;
The software appended the " and order_number = 123" as expected but because rownum = 1 had already been executed (before the and order_number = 123" the view only returned one row even WITHOUT the order_number = 123.
I need to return only ONE row for a given order number EVEN IF there are multiple records with the same order_number and line_number. Using "where order_number = <enteredOrderNumber> and line_number = 1" is not necessarily unique so that won't work.If I can't make it work this way and can't use the rownum = 1 what options do I have?
I have a view ( from many tables) , an error view in wich i monitor errors that appear in my project. This view should be empt always but whenever a error occurs the view shows me this. I wanna put a trigger or something like that on that view to send me an e-mail whenever a line is inserted in that view. ( I don't wanna use a job for that to make a count because this will affect the entire database).
If you have one table called CUST_ACCOUNTS and a view called CUST_ACCOUNTS -- and then you want to select from the view and not the table.Is there a prefix for views or something that I can have in front of the name to specify it's the view I want data from?
Which is better to use of Views and Materialized views so as to have good performance ? Also I need to search for a particular value in the view. Any function in sql to implement this ?
