In my oracle 11g database, I have two tables. The first, accitem, holds item information and the second, acchart holds chart information. Every row in table accitem is unique. There are no repetitions. In the other table, acchart item_type refers to a foreign key in the acchart table. It looks like so:
Accitem
ID Details
BS Balance sheet
PL Profit & loss
acchart
item_code item_description item_type
INC Income PL
EXP Expenses PL
Ass Assets BS
Eqt Equity BS
What I want to achieve is as follows:
Balance Sheet
+ Assets
+ Equity
Profit & Loss
+ Income
+ Expenses
How would you achieve that?
You can indeed use connect by:
select decode(level, 2, ' + ', '')||q.name from
(
select ID, Details name, null parent_id
from accitem
UNION ALL
select null ID, item_description name, item_type parent_id
from acchart
) q
start with parent_id is null
connect by prior id = parent_id
Its performance is questionable on larger datasets though.
Related
I want to find the orders number from table#orders where DelivaryDateRevision less than max revisions from each country(table#maxrevisions). Countrycode is not the foreign key to the other table.
Can I fetch the orders table records if the country code is missing in the maxrevisions table.
Table: orders
OrderNumber | CountryCode | DelivaryDateRevision
123--------------- IN-------------------9
234--------------- US-------------------3
238-------------- IN------------------ 3
table: maxrevisions
CountryCode| MaxRevision
IN ---------------6
US--------------- 4
My query:
SELECT distinct o.ordernumber,o.countrycode
FROM orders o
left outer join maxrevisions m
on o.CountryCode=m.CountryCode
and
o.DelivaryDateRevision<rs.MaxRevision;
but I am getting the wrong result. Can I get any help here?
Your major omission seems to be a WHERE clause which compares the two revisions:
SELECT
o.ordernumber,
o.countrycode
FROM orders o
LEFT JOIN maxrevisions m
ON o.CountryCode = m.CountryCode
WHERE
o.DelivaryDateRevision < m.MaxRevision OR m.MaxRevision IS NULL;
Demo
Select
ordernumber,
countrycode,
deliverydateversion
from orders o
where deliverydateversion >
(
select max(revision)
from maxrevisiontab
where countrycode= o.countrycode
)
Please change the table names and column names as per your structure.
I am working on oracle hierarchical query for the below table
Classification_Product and Order_details tables
Classification Product has the Classification_id which will be stored in the Order_detailsaccording to user selection
Classification Product table
Order_details table
I want to select all products from Order_details table that has a parent LED Screen which will return all product that has parent LED Screen no matter what the child is 32inch or 50 inch or sony samsung etc etc
I tried to use below query but its replate rows a lot
SELECT B.CLASSIFICATION_ID, LEVEL AS VLEVEL, A.CATEGORY_ID, A.CATEGORY_DESC, CONNECT_BY_ISLEAF AS leaf
FROM PRODUCT_CLASSIFICATION A, ORDER_DETAILS B
WHERE A.STATUS = 1 and b.created_on like sysdate--AND leaf =1
START WITH A.CATEGORY_ID IS NULL
CONNECT BY A.CATEGORY_ID = PRIOR A.CLASSIFICATION_ID
ORDER SIBLINGS BY A.CLASSIFICATION_ID;
select od.*
from order_details od
where
od.classification_id in (
select p.classification_id
from product p
start with p.category_desc = 'LED Screen'
connect by prior p.classification_id = p.category_id
)
I have 2 tables, COMPANY and EMPLOYEE.
COMPANY_ID is the primary key of the COMPANY table and foreign key for EMPLOYEE table. The COMPANY_ID is a 10 digit number. We are generate a 3 number combination and query the database.
The select statement has regex to bulk load the company based on COMPANY_ID. The query is executed multiple times with different patterns
i.e.
regexp_like(COMPANY_ID, '^(000|001|002|003|004|005|006|007|008|009)') .
Existing query looks something like this -
select *
from COMPANY company
where regexp_like(company.COMPANY_ID, '^(000|001|002|003|004|005|006|007|008|009)')
The new requirement is to retrieve the company information along with the employee count. For example if a company has 10 employees, then the query should return all the columns of the COMPANY table, along with employee count i.e. 10
This is the select statement that I came up with -
select
nvl(count_table.cont_count, 0), company.*
from
COMPANY company,
(select company.COMPANY_ID, count(company.COMPANY_ID) as cont_count
from COMPANY company, EMPLOYEE employee
where regexp_like(company.COMPANY_ID, '^(000|001|002|003|004|005|006|007|008|009)')
and company.CONTACT_ID = employee.CONTACT_ID
group by (company.COMPANY_ID)) count_table
where
regexp_like(company.COMPANY_ID, '^(000|001|002|003|004|005|006|007|008|009)')
and count_table.COMPANY_ID(+)= company.COMPANY_ID
Above query works, but it takes double the time compared to the previous statement. Is there a better way to retrieve the employee count?
Note: Oracle database is in use.
You don't need to execute that expensive REGEXP_LIKE twice:
select nvl(count_table.cont_count,0),company.*
from COMPANY company
,( select employee.COMPANY_ID, count(employee.COMPANY_ID) as cont_count
from EMPLOYEE employee
group by (employee.COMPANY_ID)
) count_table
where regexp_like(company.COMPANY_ID, '^(000|001|002|003|004|005|006|007|008|009)')
and count_table.COMPANY_ID(+)= company.COMPANY_ID
Or you could use a scalar subquery:
select company.*
, (select count(*)
from employee e
where e.company_id = c.company_id
)
from COMPANY c
where regexp_like(c.COMPANY_ID, '^(000|001|002|003|004|005|006|007|008|009)')
And personally I would ditch the slow REGEXP_LIKE for something like:
where substr(c.company_id,1,3) between '000' and '009'
The derived table does not add value, thus I would get rid of it and use a scalar query (because I do not know all of your columns in the company table to properly do a group by):
select c.*,
nvl(
(select count(1)
from employee emp
where emp.company_id = c.company_id
),0) employee_count
from company c
where regexp_like(c.company_id, '^(000|001|002|003|004|005|006|007|008|009)')
Also, if performance is still an issue, I would consider modifying your where statement to not use a regexp.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Addendum
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I see that the question explicitly identifies that the employee table has company_id as a foreign key. Since this is clarified, I am removing this statement:
The data model for these tables is not intuitive (would you not have
company_id as a foreign key in the employees table?).
I have a query like below - table names etc. changed for keeping the actual data private
SELECT inv.*,TRUNC(sysdate)
FROM Invoice inv
WHERE (inv.carrier,inv.pro,inv.ndate) IN
(
SELECT carrier,pro,n_dt FROM Order where TRUNC(Order.cr_dt) = TRUNC(sysdate)
)
I am selecting records from Invoice based on Order. i.e. all records from Invoice which are common with order records for today, based on those 3 columns...
Now I want to select Order_Num from Order in my select query as well.. so that I can use the whole thing to insert it into totally seperate table, let's say orderedInvoices.
insert into orderedInvoices(seq_no,..same columns as Inv...,Cr_dt)
(
SELECT **Order.Order_Num**, inv.*,TRUNC(sysdate)
FROM Invoice inv
WHERE (inv.carrier,inv.pro,inv.ndate) IN
(
SELECT carrier,pro,n_dt FROM Order where TRUNC(Order.cr_dt) = TRUNC(sysdate)
)
)
?? - how to do I select that Order_Num in main query for each records of that sub query?
p.s. I understand that trunc(cr_dt) will not use index on cr_dt (if a index is there..) but I couldn't select records unless I omit the time part of it..:(
If the table ORDER1 is unique on CARRIER, PRO and N_DT you can use a JOIN instead of IN to restrict your records, it'll also enable you to select whatever data you want from either table:
select order.order_num, inv.*, trunc(sysdate)
from Invoice inv
join order ord
on inv.carrier = ord.carrier
and inv.pro = ord.pro
and inv.ndate = ord.n_dt
where trunc(order.cr_dt) = trunc(sysdate)
If it's not unique then you have to use DISTINCT to deduplicate your record set.
Though using TRUNC() on CR_DT will not use an index on that column you can use a functional index on this if you do need an index.
create index i_order_trunc_cr_dt on order (trunc(cr_dt));
1. This is a really bad name for a table as it's a keyword, consider using ORDERS instead.
I need to move some code from C# into a Stored Procedure for speed reasons. What I'm trying to get is a unique list of TemplateIds from the RoleTemplates (or CategoryToRoleTemplate) table based on a CategoryId.
However, I need the query to walk the Category.ParentId relationship, and collection all of the parent's related TemplateIds. This needs to happen until the ParentId is null.
Ideally the result should be a unique list of RoleTemplate.TemplateIds.
Table structure...
Categories
------------------------------
CategoryId uniqueidentifier
ParentId uniqueidentifier <-- Relationship to Categories.CategoryId.
Name varchar (50)
CategoryToRoleTemplate
------------------------------
CategoryId uniqueidentifier <-- Relationship to Categories.CategoryId.
TemplateId uniqueidentifier <-- Relationship to RoleTemplates.TemplateId.
RoleTemplates
------------------------------
TemplateId uniqueidentifier
Name varchar (50)
I'm using SQL Server 2008 R2.
Thanks!
EDIT:
Final solution:
with CategoryHierarchy (ParentId)
as (
-- Anchor member definition
select CategoryId from Categories
where CategoryId = #id
union all
-- Recursive member definition
(select c.ParentId from Categories as c
inner join CategoryHierarchy as p
on c.CategoryId = p.ParentId)
)
select distinct TemplateId from CategoryToRoleTemplates where CategoryId in (select CategoryId from CategoryHierarchy);
Thanks to all who answered! CTEs were the key.
I would suggest a CTE for doing that query. Keep in mind though that the tree will actually START at null and go until exhausted.
Example (may or may not work OOB given your code):
; WITH CategoryTree(CategoryID, sorthelp) AS
(SELECT CategoryID, 0 FROM Categories WHERE ParentID IS NULL)
UNION ALL
(SELECT C.CategoryID, CT.sorthelp + 1 FROM Categories C INNER JOIN CategoryTree CT ON C.PARENTID = CT.CategoryID)
SELECT DISTINCT TemplateID FROM RoleTemplates WHERE CategoryID IN (SELECT CategoryID FROM CategoryTree)
Good Point(tm): Don't forget the semicolon before the WITH keyword.
Use a recursive common table expression:
http://msdn.microsoft.com/en-us/library/ms186243.aspx
Please check this link http://msdn.microsoft.com/en-us/library/ms186243.aspx
I would go first with the table Categories with the with syntax and after that join with the others tables.
I'm short on time at the moment, so I can't be specific, but I would look into Common Table Expressions, which I've used successfully in the past to implement recursion.