Performance Of Joining Two Table In Diffrent Databse
Nov 19, 2007
I have two databses SIS and SIS_Pro. Users tables should be used in both of them because I have some relations between this table with other table in SIS and SIS_Pro. Users in SIS only have one column and it is the UserId which is the primary Key in both of them, but in SIS_Pro Users table have Firstname Lastname and... now. In my program I need some informatin from SIS and some from SIS_Pro so I create a view which is joining of forexample exam in SIS and Users in SIS_Parnian, becuase I don't have the firstname and lastname in a Users table which is in SIS_Pro databse.Does it reduce the performance?is it better to copy datas which are in Users in SIS to Users in SIS_Pro( I mean all columns firstname, lastname ,,.....)
Sincerely
Kianoosh
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Sep 9, 2003
In a simple join query, such as
SELECT *
FROM a, b
WHERE a.id = b.id
if table 'a' has 1 million and table 'b' has few thousands of records, will the order of the tables in from class will make any difference?
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May 1, 2006
Over the years I've read and experienced where joining more then 5 tables can lead to performance problems. This number can vary based upon the amount of data in each table, if and how indexes are used and the complexity of the query, but 5 has always been a good rule of thumb. Unfortunately I do not know what rule to apply in regards to joing views.
A developer has experienced timeout problems periodically when opening a view in EM or when running the code which makes-up the view. I decided to look at the view and noticed it references tables and views, which reference more views, which in turn reference other views. In all the initial view references 5 tables and 8 views directly and indirectly, with some of the views containing function calls. What are your thoughts on how many views and tables are too many when it comes to joins and query performance.
Thanks, Dave
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May 9, 2008
hi
i want read table name in database in sql while loop statement
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Dec 11, 2007
Hi I need to know if it is possible to write on a table from another database and this using a stored procedure. If yes what is the correct syntax to connect to the other database.
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Jun 6, 2007
Hi, i am trying to find permissions on SQL server database tables for a usergroup defined in Active Directory.
there is one function in SQL : €œSELECT * FROM fn_my_permissions('TableName', 'OBJECT')€?
This function get me the permission on TableName table for the current user. but i want that inforamtion for a user group defined in AD.
Is tehre any way to acheive that?
-Mani
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May 25, 2007
Hai Everbody,
for me in my project i want to read data from a csv file and insert it in a sql server databse table.The csv file may contain n number of columns,but i want only certain columns from that, and insert it in the database table.How to achieve this. Plz help me it is urgent. Thanks in advance.
Thanks and regards
Biju.S.G
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Mar 11, 1999
Hi,
I have to export the table data from my databse into text files as I nedd to put it in Informix database using a sheel script. Is there a way by which I can do this.
Is there any other way by which I can put the data from SQL Server to Informix.
Any takers,
Thanking you in advance.
Bye for now,
Himauhu
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Apr 20, 2015
I run into a problem when asking to show a query of employee vacation days.
table 1:
column1 Â is dates
e.g.
2015-01-01
2015-01-02
2015-01-03Â
.
.
.
2015-12-31
table2:
employeeID
vacation_date
Tom
2015-01-03
Tom
2015-01-04
David
2015-01-04
John
2015-01-08
Mary
2015-01-012
My query output need to be:
2015-01-01
2015-01-02
2015-1-03
Tom
2015-01-04
Tom
2015-01-04
David
2015-01-05
2015-01-06
2015-01-07
2015-01-08
John
2015-01-09
2015-01-10
2015-01-11
2015-11-12
Mary
... etc... all the way to 2015-12-31
when i use left outer join, i only record one employee per date.
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Jun 4, 2015
I am looking for an alternate logic for below-mentioned code where I am inserting into a table and having left join with the same table
insert TABLE1([ID],[Key],[Return])
select distinct a.[ID],cat1,cat2Â from
(select ID,[Key] Cat1 ,[Return] cat2 from @temp as temp) a left join TABLE1 oon a.ID= o.ID
and a.Cat1 = o.[Key]
and a.cat2 = o.[return]
where [key] is null order by ID
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Aug 22, 2007
hi
i have 2005 express on 2000 sp4
i made a backup devices for the app db
and for every one of the system database.
and with those devices backup and restore.
can i manually configure the system db or i must restore them?
i have an issue where i downloaded and installed v.9.00.2047
while my backups where on v.9.00.1399
tahnks
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May 5, 2008
I have a table as below:
user_id app_id form_id
1 a 1245
1 a 1345
1 b 1548
2 a 1245
2 a 1345
2 a 1411
2 b 1678
2 c 1245
3 b 1678
Now I want compare user 1 with user 2, and find out the records for user 2 where there are no app_id and from_id the same as user 1, so the output should be"
2 a 1411
2 b 1678
2 c 1245
Please advise how I can do this. Many thanks.
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Jan 26, 2015
I have tables Companies, CompaniesDetails (the company branches), Addresses and Companies_Addresses.
The addresses table contain street and city while the Companies_Addresses has the keys for both companies and branches ,i.e., they are linked to Companies and CompaniesDetails via CompanyID and CompanyDetailID and to Addresses via addressID.
Companies_Addresses
id (PK)
companyID (FK)
companyDetailID (FK)
addressID (FK)
I am able to get the branch address at the moment with this code but I would like to get the company address as well using a single select statement.
Code:
SELECT DISTINCTAddresses.city as branchCity, Addresses.street as branchStreet
FROMCompanies
LEFT JOINCompaniesDetails AS cd ON companies.companyID = cd.companyID
LEFT JOINCompanies_Addresses AS c ON c.companyDetailID = cd.companyDetailID
LEFT JOINAddresses ON c.addressID = Addresses.addressID
WHERE Companies.name LIKE 'abc'
ANDCompanies.status_indicator like 'Current'
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Dec 6, 2005
If a table gets joind with itself and then joined again with itself, is it possible to perform one kind of outer join from the third table to the second tabe and having the range of records in the second table limited to the joins between the first and the second table?
Join on RegionID Join on RegionID and City
Show records not qualifying for the joint
but limited to the scope of of records
established by the first joint
_______________ ________________ _______________
| | | | | |
| RegionID One | | RegionID One | | RegionID One |
|_______________| | City New York | | City New York|
|________________| |_______________|
_______________ ________________ _______________
| | | | | |
| RegionID One | | RegionID One | | RegionID One |
|_______________| | City New York | | City New York |
|________________| |_______________|
_______________ ________________ _______________
| | | | | |
| RegionID One | | RegionID One | | RegionID One |
|_______________| | City Buffalo | | City New York |
|________________| |_______________|
Plotin
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Jul 19, 2007
hi friends can any body help fo rthe below issue:
stock
========
Item cost
pen150
pencil 150
stockdt
=========
Item qty
pen10
pen15
pencil 10
pencil 15
for the above two table of stock,stockdt the o/p should come like this
Item cost qty std.cost
pen 150 25 3750
pencil 150 25 3750
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Nov 13, 2007
Hi guys,
This is regarding the joins...for instance I have three Tables A, B, C. And they are related to each other. If I am joining A->B,B->C then is it necessary to join A->C too? what happens if I omit join A->C? and what happens if I include join A->C too?
Thanks,
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Sep 7, 2005
Hello allLet's say I have 1 table "contract" containing the following data:id year sales45 2005 10045 2004 9589 2005 25089 2004 27512 2005 42I want to make a table with one unique row for each id and then a column for2004 sales and 2005 sales, like this:select a.id, a.sales, b.salesfrom contract a, contract bwhere a.contract=b.contract(+)and a.year=2005and b.year=2004The rows for id 45 and 89 are shown perfectly. But id 12 is not shown at allbecause it doesn't have a record for 2004!! I don't know why 'cause Iouterjoined the tables.It works perfectly when I have two distinct tables for each year (forinstance contract_2005 and contract_2004). So the problem seems to be in thefact I like to join one table with itself.Someone has a solution for this?thanks!Maarten
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Oct 10, 2007
Good day
I'm having a problem where I get diffrent results between SQL2000 and 2005.
I have have the following view:
Code Block
SET ANSI_NULLS OFF
GO
SET QUOTED_IDENTIFIER OFF
GO
ALTER VIEW [dbo].[vUsrMsgInfo] AS
SELECT dbo.vMsgInfo.Body, dbo.vMsgInfo.FinalBody, dbo.vMsgInfo.BodyType, dbo.vMsgInfo.MsgID, dbo.vMsgInfo.Status, dbo.vMsgInfo.Creator, dbo.vMsgInfo.Created,
dbo.vMsgInfo.StatusTime, dbo.vMsgInfo.StatusReason, dbo.vMsgInfo.Via, dbo.vMsgInfo.RouteAt, dbo.vMsgInfo.Source, dbo.vMsgInfo.Priority, dbo.vMsgInfo.Subject,
dbo.vMsgInfo.RouteRuleName, dbo.UsrMsgInfo.Usr, dbo.vMsgInfo.SequenceNo, dbo.vMsgInfo.SendEnv, dbo.vMsgInfo.EnvCount, dbo.vMsgInfo.OwnerOrg,
dbo.vMsgInfo.OwnerPerson, dbo.vMsgInfo.ToWildAddr, dbo.vMsgInfo.BodySize, dbo.vMsgInfo.RoutedRoute, dbo.vMsgInfo.NoteBody, dbo.vMsgInfo.ToOrg,
dbo.vMsgInfo.CreatorOrg, dbo.vMsgInfo.FaxMode
FROM dbo.UsrMsgInfo RIGHT OUTER JOIN
dbo.vMsgInfo ON dbo.UsrMsgInfo.Message = dbo.vMsgInfo.MsgID
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
I run the following query:
Code Block
Select * from vUsrMsgInfo where usr='cdk'
In SQL2000 I get a resultset that includes nulls and cdk in the usr column.
In SQL2005 however I only get results that has cdk in the usr column.
Is there a way to replicate the 2000 results in 2005??
Thanks & Regards
Corne.
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Apr 3, 2008
I have a problem with the dates and "datetime" picker in my report (sqlserver 2005 sp2).
My reginal settings on the server are: "hebrew" - "Isreal".
I have a report with a datetime picker.
If I'm opening the report from: http://myserver/REPORTSERVER and I'm writting in the datepicker textbox the value "01/04/2008", and then click on the calander icon it opens on the on the 4th of january 2008.
If I'm opening the report from: http://myserver/REPORTS and I'm writting in the datepicker textbox the value "01/04/2008", and then click on the calander icon it opens on the on the 1th of april 2008.
Does anybody know this bug and how to wotk with it?
Thanks.
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Sep 20, 2013
What sort of script would convert a pre-existing table into the second below?
I only want to merge the columns with Primary_IDs 1111 & 3333 to have the same Secondary_ID values, without duplicating any similar Secondary_ID values between the 2 which I've marked in red below.
Code:
TABLE A
==========
Primary_ID | Secondary_ID
1111 | 1
1111 | 2
1111 | 3
1111 | 4
3333 | 1
3333 | 2
3333 | 10
3333 | 20
3333 | 100
3333 | 200
5555 | 12
5555 | 34
7777 | 56
7777 | 78
Code:
NEW TABLE A
==========
Primary_ID | Secondary_ID
1111 | 1
1111 | 2
1111 | 3
1111 | 4
1111 | 10
1111 | 20
1111 | 100
1111 | 200
3333 | 1
3333 | 2
3333 | 3
3333 | 4
3333 | 10
3333 | 20
3333 | 100
3333 | 200
5555 | 12
5555 | 34
7777 | 56
7777 | 78
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Oct 1, 2013
I am trying to convert the following sql to linq
SELECT R.UserID,R.Cntrl_nbr FROM User R
WHERE (
R.REG_ID=
(SELECT MAX(B.REG_ID)
FROM User B
WHERE R.UserID = B.UserID )
The linq I am using is
var query = (from n2 in q1
where
n2.RegServiceTs == (q1.Where(c1 => c1.UserID == n2.UserID).Max(c2 => c2.REG_ID))
select n2).SingleOrDefault();
This is slow and is there a better way to do this?
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Oct 8, 2013
I need the last year sales(lastyearsales), first name, last name and city from the following tables. The relation is as following:
SalesPerson<->Employee <- EmployeeAddress<-Address
SalesPerson<->Employee <-Contact
SalesPerson Table
1.SalesPersonID
lastyearsales
Employee Table
1.EmployeeID
2.ContactID
Contact Table
2.ContactID
FirstName
LastName
EmployeeAddress Table
1.EmployeeID
3.AddressID
Address
3.AddressID
City
And my answer:
Select: C1.firstname, C1.lastname, SP.lastyearsales, A.city
From: SalesPerson as SP join Employee as E1 on Sp.salespersonID = E1.EmployeeID
Right Join Employee as E2 on E1.EmployeeID=E2.EmployeeID join Address as A on E2.AddressID = A.AddressID
Right Join Employee Contact as C1 on E1.ContactID = C1.ContactID
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Jul 16, 2014
In the following example, I have a "Person" table, and a many-to-many "Relationship" table which stores the r/ship between any two people:
[Person] [Relshp]
---------------- ---------------------
| PersonId PK|<-.-. | RelshpId PK |
| PersonName | '-| PersonId |
---------------- '--| RelatedToPersonId |
| RelationshipType |
---------------------
There are 2 FK constraints, linking
1. [Relshp].[PersonId] to primary key [Person].[PersonId], and
2. [Relshp].[RelatedToPersonId] to primary key [Person].[PersonId].
What kind of index structure would best support those FK constraints?
Would it be:
a) One combined index:
CREATE INDEX IX_Relshp ON Relshp (PersonId, RelatedToPersonId)
or
b) Two indexes:
CREATE INDEX IX_RelshpP ON Relshp (PersonId)
CREATE INDEX IX_RelshpR ON Relshp (RelatedToPersonId)
or
c) Two "mirrored" combined indexes:
CREATE INDEX IX_RelshpP ON Relshp (PersonId, RelatedToPersonId)
CREATE INDEX IX_RelshpR ON Relshp (RelatedToPersonId, PersonId)
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Oct 15, 2006
Hi,
Sorry if this has been asked before, I looked through the FAQ but could not find an answer to the following.
I have a Project table which contains amongst other fields, a CreatedByID field and a LastModifiedByID field. Both these fields point to a User table. What I would like to do is get the two usernames from a query on the project table.
I know how to get one usename using the following Sql command but how do I get access to the second username ?
SELECT Project.Name,User.Username FROM Project,User WHERE Project.ID=@id AND User.ID = Project.CreatedByID;
I hope my ramblings make sense
Andy
Andy
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Dec 19, 2007
use default pubs database in sqlserver2000.
use authors table and publishers table.
Write a query to list first name, last of all authors
and name of the publisher (if any) present in the same city
as the author. If no publisher is present in the city
where the author is located then the column should contain a
NULL value. If there is more than one publisher in the city
where the author is located, then the details of
the author are to be repeated for each publisher.
but there is no field match between authors table and publishers table.
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Jul 23, 2005
My main table has the following structure:t1 (id_primary, id_secundary, name) i.e. [(1,1,"name1"), (2,1,"name2")]I want to join this table with the following second table:t2 (id_primary, id_secundary, value) i.e. [(1, NULL, "value1"),(NULL,1,"value2")]The join should first try to find a match on id_primary and only if thatfails it should find a match on id_secundary. Every row in t1 is matchedagainst a single row in t2.The following query works:selecta.name, isnull(b.value, c.value)fromt1 a left outer join t2 b on a.id_primary = b.id_primaryleft outer join t2 c on a.id_secundary = c.id_secundaryI'm wondering though if it would be possible to write a query that only usest2 once, since it actualy is quite a complex query that is calculated twicenow. Any ideas (besides using a temp table)?
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Apr 29, 2008
I have query that takes 12 minutes to execute. The query uses around 9 tables but I have narrowed down the problem to one table that has over 65 million rows. The problem table has only 3 fields
FieldOne (PrimaryKey)
FieldTwo Varchar(3000)
FieldThree Varchar(3000)
The query uses the primary key of this table to perform the join. FieldTwo and FieldThree are only used as output parameters.
I noticed if I remove FieldTwo and FieldThree from the output (but still leave the table in the query), the query executes in 1 second. However if I include FieldTwo and FieldThree in the output, the query takes over 12 minutes to execute.
I cannot index FieldTwo and FieldThree because of the field size and I cannot reduce the size of the fields because of the data that needs to be stored in it? How can I index or do something similar to speed up the table look up.
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Apr 9, 2008
Dear friend, the following is my query.
i am retreiving from the same table with different condition
1.SELECT a.Avg_Binaryvalue as Avg1,a.Min_Binaryvalue as Min1 from MeasurementData a where Attribute_Flag ='5'
2.SELECT b.Avg_Binaryvalue as Avg2,b.Min_Binaryvalue as Min2 from MeasurementData b where Attribute_Flag ='6'
this two query gives resulsets
i need to join this two resultsets. please give me sample query to join this two result sets
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May 30, 2008
Dear all,
I have four different tables with three columns. The first two columns are equal for all tables. The third column is different:
Table I
COUNTRY | PRODUCT | SALES VALUE
AAA AAA 10
AAA AAB 10
Table II
COUNTRY | PRODUCT | SALES COST
AAA AAC 10
Table III
COUNTRY | PRODUCT | SALES MARGIN
AAB AAA 10
Table IV
COUNTRY | PRODUCT | SALES XXX
AAA AAA 5
What I would like to accomplish is to obtain a table where the records from these tables would be joined in a single table:
COUNTRY | PRODUCT | SALES VALUE | SALES COST | SALES MARGIN | SALES XXX
AAA AAA 10 0 0 5
AAA AAB 10 0 0 0
AAA AAC 0 10 0 0
AAB AAA 0 0 10 0
Can you advise me on what the best way to achieve this is? Thanks!
Kind regards,
Pedro Martins
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Aug 10, 2007
Hello,
I am new in SSIS.
I am using an OLEDB source and setted as SQL Command.
The Query is a JOIN between different databases.
How can I make the QUERY with different source (different databases or SQL Servers)?
I mean, any solution is OK, the important is to make queries against different databases with SSIS.
Thank
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Nov 15, 2004
Hello everyone,
I'm stuck on something here. Any help would be great. This is a relational database question.
I'm trying to inner join two columns of one table with one column of another. The follwoing code doesn't work, but I think you can see what I'm trying to do.
Procedure _Links_List
AS
CREATE TABLE #TempTable
(
LinkId int,
LinkCategory varchar(50),
LinkStatus varchar(50),
LinkName varchar(50)
)
INSERT INTO #TempTable
(
LinkId,
LinkCategory,
LinkStatus,
LinkName
)
SELECT
LinkId,
_SubCategories.SubCategoryName,
_SubCategories.SubCategoryName,
LinkName
FROM
_Links
INNER JOIN
_SubCategories ON _Links.CategoryId = _SubCategories.SubCategoryId
INNER JOIN
_SubCategories ON _Links.StatusId = _SubCategories.SubCategoryId
SELECT
LinkId,
LinkCategory,
LinkStatus,
LinkName
FROM
#TempTable
Also, I know how to do this if I had seperate category tables for each category (LinkCategory, LinkStatus). For examlple:
Procedure _Links_List
AS
CREATE TABLE #TempTable
(
LinkId int,
LinkCategory varchar(50),
LinkStatus varchar(50),
LinkName varchar(50)
)
INSERT INTO #TempTable
(
LinkId,
LinkCategory,
LinkStatus,
LinkName
)
SELECT
LinkId,
_Links_Categories.CategoryName,
_Links_StatusCategories.StatusName,
LinkName
FROM
_Links
INNER JOIN
_Links_Categories ON _Links.CategoryId = _Links_Categories.CategoryId
INNER JOIN
_Links_StatusCategories ON _Links.StatusId = _Links_StatusCategories.StatustId
SELECT
LinkId,
LinkCategory,
LinkStatus,
LinkName
FROM
#TempTable
I know the above works but I'm trying to figure out how to have just one category table and one subcategory table for all of my categories of all my tables.
Table_Categories: CategoryId (Primary Key), CategoryName
Table_SubCategories: CategoryId, SubCategoryId (Primary Key), SubCategoryName
So instead of having to create a new table for every category and all the procedures for them for all my tables, I want to be able to just use these two tables.
If anyone knows how I go about this, especially when a table uses two category columns, I Thank you.
Alec
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Jun 8, 2007
Hello all,
I am Using MSSQL and ASP Classic for this project. Let me explain my problem, i have two tables:
Users
ID
Username
ChangeLog
ID
Description
UserID
DateChanged
The Users table will contain one record for each user in the system.
The ChangeLog table can contain any number (including 0) of rows relating to each user, when a change to the users account is made, and entry is put into the ChangeLog table.
The object of my report is to display a list of all users in the system and display the date and description of the last change made to the user.
So far i have written this:
Code:
SELECT Users.ID, Users.Name, ChangeLog.Description, ChangeLog.DateChanged
FROM Users
LEFT OUTER JOIN ChangeLog ON (ChangeLog.UserID = Users.ID)
ORDER BY ChangeLog.DateChanged DESC
However, if a user has got more than one change against it then a row will be returned for each change instead of just showing the latest change. So i then tried this:
Code:
SELECT Users.ID, Users.Name, ChangeLog.Description, ChangeLog.DateChanged
FROM ChangeLog
LEFT OUTER JOIN Users ON (Users.ID = ChangeLog.UserID)
ORDER BY ChangeLog.DateChanged DESC
The problem with this one? It only shows users that have actually had a change made to them, and the report *needs* to display ALL users regardless of wether they have been changed or not.
I'd appretiate any help you can give me at all, thanks in advance!
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Jan 2, 2007
Dear All,
What's the most efficient way of joining a 1 to many relation, where a record in table A will have multiple records in table B.
I'd like to select every record in table A but only joining the last relevant record from table B. So:
Table A:
A1 Prj1
A2 Prj2
Table B:
B1 A1 23/12/2005
B2 A1 26/12/2005
B3 A1 2/1/2007
B4 A2 25/12/2006
B5 A2 1/1/2007
So I'd like to list using the most efficient way this:
A1 Prj1 B3 2/1/2007
A2 Prj2 B5 1/1/2007
I'm assuming this is NOT the most efficient way:
select A, (select top 1 date from B orderBy ...)
Any suggestions?
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