Just curious if anyone has any in depth knowledge of how table join filtering works:
SELECT col1
FROM tbl1 a
INNER JOIN tbl2 b
ON a.col2 = b.col2
AND a.col3 = 1
(versus)
SELECT col1
FROM tbl1 a
INNER JOIN tbl2 b
ON a.col2 = b.col2
WHERE a.col3 = 1
Running some simple tests, the executions plans look identical. Does anyone know if/when either of these options would be preferential over the other? This is a rather difficult topic to Google and find any decent information.
I am wondering if tempdb stores all results tempararily whenever I query a large fact table with over 4 million records which joins another dimension table? Since each time when I run the query, the tempdb grows to nearly 1GB which nearly runs out all the space on my local system drive, as a result the performance totally down. Is there any way to fix this problem? Thanks a lot in advance and I am looking forward to hearing from you shortly for your kind advices.
I was looking at some sample queries on how to do product promotion. Basically im after the top few products that have been ordered along with a given product ID. I think this should do it, but wasnt sure about the 2nd join...and why ?
SELECT ProductID, ProductName, SUBSTRING(Description, 1, 150) + '...' AS Description FROM Products WHERE ProductID IN ( SELECT TOP 5 details2.ProductID FROM OrderDetails details1 INNER JOIN OrderDetails details2 ON details1.OrderID = details2.OrderID WHERE details1.ProductID = @ProductID AND details2.ProductID != @ProductID GROUP BY details2.ProductID )
I have 3 tables, students (studentId, studentName), classes (classId, className) and studentclass (studentId, classId, sessionId)
Want to display all studentnames, classnames and sessionIds, regardless of whether the student is enrolled in a specific class or not. So the result set should show all students and all classes: studentname classname sessionId ----------- --------- --------- john english 2 john math <null> jane english <null> jane math 3
Please help in how to write such SQL? Thanks in advance
I'm having two general problems trying to do a JOIN. I have a table withthree fields {Code, Date, Amount}. Code+Date is a unique key. I'm tryingto get a rowset with 1) one row for each unique Code+Date pair, 2) andwith each row containing, {Code, Amount for Date-A and Amount forDate-B}. Basically, I want to create two temp tables with the Amounts fora specified Date and then Join them.The problems are1) I'm trying to do this in SQL-Server 7 with a single stantment, and2) If a Code+Date pair doesn't have any Amounts, I'd still like a rowreturned with NULLs.Anybody have any wisdom on this??Thanks
I got this problem where I need to look up values in two columns fromanother table.I can get OUTER LEFT JOIN working when looking up one column from a tablebut when looking up at two columns from a table I can't get the SQL syntaxcorrect.The scenario isA table has definitions for abbreviation of initials. From my search querythere are two columns of initials, I am having problems in writing an SQLstatement to look up and replace both columns of initials with theircorrect definitions. I was using an OUTER LEFT JOIN statementI am sorry if this isnt the correct Newsgroup to post this.
I'm trying, with little success, to achieve something that should be quite easy (I think!) and any advice would be appreciated.
I have a leagues table structured so:
LeagueID | Name | Player1 | Player 2 ... Player6
and the data in the player columns is a userid from the users table and I'm trying to display the Leagues but with the player names rather than player IDs.
I'm working along the lines of
Code:
select u1.displayname as Player1, u2.displayname as Player2 from DCMLeagues as L inner join Users as u1 on L.player1 = u1.userid inner join Users as u2 on L.player2 = u2.userid
but with little success so far. Any thoughts would be appreciated! Thanks very much in advance.
I have very large sql server with 15 databases and thousands of tables. We have an "employee" table where we have historically been joining to the "EmployeeName" field in procs, views, etc.(bad practice, I know). I would like to now go back and make things right. I would like to identify ALL procs and views that have a join on the "EmployeeName" field, and modify it to use the "employeeid" field. I would like a script or a suggestion that would help me identify all the places where I would need to make this change.
I thought of querying the syscomments table, but the joins are not always laid out the same way so I know I wouldn't be able to catch all of them. Maybe using profiler to capture all statements executed and have them trigger an email to a DB developer every time? I don't know... Suggestions?
Hi I'm new to SQL and I'm having some problems with the following join. I have a table, Ticket, with two int fields, Submitter and Acceptor, among many others. These fields reference the ID of users stored in the Users table and are usually set to different IDs (ie. they are independant fields).
Here is the relevent SQL to get the ticket records (generated by the Query Editor in SQL Management Studio Express):
SELECT Users.Name, Tickets.ID FROM Tickets INNER JOIN Users ON Tickets.Submitter = Users.ID AND Tickets.Acceptor = Users.ID
Problem is, this only returns records where the submitter and acceptor IDs are the same which is rarely the case. What am I doing wrong here? I've created a lot of joins for other records without problem - this is the only case where two fields are coming from the same table.
Hello all,Can someone help me with this SQL?1) EMPLOYEE table has columns 'employee_id' and 'emp_sid' and othercolumns2) EMPLOYEE_BENEFITS table has a column called employee_entity, thiscolumn can be joined to either 'employee_id' OR 'emp_sid' but not bothin the EMPLOYEE table.3) EMPLOYEE_TRACK table has column called employee_track_entity, thiscolumn can be joined to the employee_benefits_id (PK) of theEMPLOYEE_BENEFITS table.I am listing the sql for the tables (the tables shows only the columnsin question)CREATE TABLE [dbo].[EMPLOYEE] ([employee_id] [int] IDENTITY (1, 1) NOT NULL ,[empsid_id] [int] NOT NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[EMPLOYEE_BENEFITS] ([employee_benefits_id] [int] IDENTITY (1, 1) NOT NULL ,[employee_entity] [int] NOT NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[EMPLOYEE_TRACK ] ([employee_track_id] [int] IDENTITY (1, 1) NOT NULL ,[employee_track_entity] [int] NOT NULL) ON [PRIMARY]GOSELECT * FROM EMPLOYEE eINNER JOINEMPLOYEE_BENEFITS eb ON (e.employee_id = eb.employee_entity ORe.empsid_id = eb.employee_entity)INNER JOINEMPLOYEE_TRACK et ON eb.employee_benefits_id = et.employee_track_entityThe above SQL I wrote is this: the second inner join uses a OR to joineither of the columns in the first table EMPLOYEE. There is performancedegradation with this SQL. With huge data It takes about 30 seconds toexecute. I know this is not the perfect way to do it, can anyone of theSQL Gurus please enlighten me to a faster approach?If I dont use the OR I can try left join on the same tableEMPLOYEE_BENEFITS twice by changing the join types, but If I did thiswhat table alias can I use to join to the 3rd table?SELECT * FROM EMPLOYEE eLEFT JOINEMPLOYEE_BENEFITS eb1 ON e.employee_id = eb.employee_entityLEFT JOINEMPLOYEE_BENEFITS eb2 ON e.empsid_id = eb.employee_entityINNER JOINEMPLOYEE_TRACK et ON [???].employee_benefits_id =et.employee_track_entitythanksadi[Sorry I am posting this twice, on SQL Programming forum too]
I'm new to SQL 2005 & C# - I'm a MySQL/PHP crossover.
I'm using s Stored Procedure and I'm trying to do multiple joins onto one table. I have 6 fields in one table that are foreign keys of another table:
Table1
---------
id
PrimaryCode
SecondaryCode1
SecondaryCode2
SecondaryCode3
SecondaryCode4
SecondaryCode5
Table 2
---------
id
Title
CommCode
The fields in table 1 (except is obviously) hold the id of a row in Table 2. When displaying data I want to display "Title" - "CommCode" for each item in Table 1. I got myself started by searchig on the net and I have a stored procedure. The obvious problem is that as it goes through the Query only the last value remains in place - since each value before it is cleared in the UNION. How can I do this?? Here's my Stored Procedure:
=====================================
ALTER PROCEDURE GetRegistersSpecific
@SearchTxt int
AS
SELECT registrations.Company,registrations.Address1,registrations.Address2,registrations.City,registrations.State,registrations.Zip,registrations.ContactName,registrations.Phone,registrations.Fax,registrations.Email,registrations.Website,registrations.Feid,registrations.BusinessType,registrations.BackupWitholding,registrations.SignedName,registrations.SignedDate, PrimaryCode AS MyID, Title, CommodityCode
FROM registrations
JOIN CommodityCodes ON PrimaryCode = CommodityCodes.id
UNION
SELECT registrations.Company,registrations.Address1,registrations.Address2,registrations.City,registrations.State,registrations.Zip,registrations.ContactName,registrations.Phone,registrations.Fax,registrations.Email,registrations.Website,registrations.Feid,registrations.BusinessType,registrations.BackupWitholding,registrations.SignedName,registrations.SignedDate, SecondaryCode1 AS MyID, Title, CommodityCode
FROM registrations
JOIN CommodityCodes ON SecondaryCode1 = CommodityCodes.id
UNION
SELECT registrations.Company,registrations.Address1,registrations.Address2,registrations.City,registrations.State,registrations.Zip,registrations.ContactName,registrations.Phone,registrations.Fax,registrations.Email,registrations.Website,registrations.Feid,registrations.BusinessType,registrations.BackupWitholding,registrations.SignedName,registrations.SignedDate, SecondaryCode2 AS MyID, Title, CommodityCode
FROM registrations
JOIN CommodityCodes ON SecondaryCode2 = CommodityCodes.id
UNION
SELECT registrations.Company,registrations.Address1,registrations.Address2,registrations.City,registrations.State,registrations.Zip,registrations.ContactName,registrations.Phone,registrations.Fax,registrations.Email,registrations.Website,registrations.Feid,registrations.BusinessType,registrations.BackupWitholding,registrations.SignedName,registrations.SignedDate, SecondaryCode3 AS MyID, Title, CommodityCode
FROM registrations
JOIN CommodityCodes ON SecondaryCode3 = CommodityCodes.id
UNION
SELECT registrations.Company,registrations.Address1,registrations.Address2,registrations.City,registrations.State,registrations.Zip,registrations.ContactName,registrations.Phone,registrations.Fax,registrations.Email,registrations.Website,registrations.Feid,registrations.BusinessType,registrations.BackupWitholding,registrations.SignedName,registrations.SignedDate, SecondaryCode4 AS MyID, Title, CommodityCode
FROM registrations
JOIN CommodityCodes ON SecondaryCode4 = CommodityCodes.id
UNION
SELECT registrations.Company,registrations.Address1,registrations.Address2,registrations.City,registrations.State,registrations.Zip,registrations.ContactName,registrations.Phone,registrations.Fax,registrations.Email,registrations.Website,registrations.Feid,registrations.BusinessType,registrations.BackupWitholding,registrations.SignedName,registrations.SignedDate, SecondaryCode5 AS MyID, Title, CommodityCode
FROM registrations
JOIN CommodityCodes ON SecondaryCode5 = CommodityCodes.id
I have a correction to my previous thread all values are '83' not '80' My mistake
Message as it should be:
am new to SQL.
MY issue: Table (A) has the customerID field as a primary key. Table(b) has a customerID field but isn't the primary key. I am selecting all records from Table(A) and Table(B) Where Table(A).customerID=83 AND Table(B).customerID=83.
Table(A) has the customerID '83' Table(B) doesn't. The int 83 doesn't exist in table(B)
The various joins I constructed always returns (0 row(s) affected). When I enter a value that is inboth tables I get the desired result.
MY Goal: I would like one record returned from table(A) if the customerID is not present in table(B) and one record that has a single customerID in both table(A)and Table(B)
I have a quite unusual problem, and I have hard time finding the answer.
I have a table with Locations - lets say that it has just ID, and Name, and a Transport table containing the ID, ArrivalLocationID and DepartureLocationID.
Now - when I select the Transport table I want to get names of the Arrival and Departure locations from th other table.
If it was a single link I woul do an INNER JOIN like:
SELECT Transport.*, Locations.Name AS ArrivalLocation FROM TransportProductOperationPeriods INNER JOIN Locations ON Transport.ArrivalLocation = Locations.ID
But I want to do a double INNER JOIN between two same table. And here I get a problem - how to do it? Something like:
SELECT TransportProductOperationPeriods.*, Locations.Name AS LArrivalLocation, Locations.Name AS LDepartureLocation, Locations.ID AS LArrivalLocationID, Locations.ID AS LDepartureLocationID FROM TransportProductOperationPeriods INNER JOIN Locations ON TransportProductOperationPeriods.ArrivalLocation = LArrivalLocationID INNER JOIN Locations ON TransportProductOperationPeriods.DepartureLocation = LDepartureLocationID
I have a table with call data (ContactID, Queues Entered, Call Status, Date & Time Stamps etc). Each entry relating to a contact ID goes onto a new row. The first row for a contact is the date and time it is created. It then captures the queue (or queues) it enters before it is answered. Finally, it captures when the call is released (Completed).
I'm trying to link all this data into one single row per contact ID to make it easier to report on.
I started off by using DISTINCT to pull back all of the Contact ID's. I then used a Left Join to pull back the date and time of creation. I created a further Left Join to pull back the first queue that it entered and so on.
When I did this, I started getting duplicates. This is because some calls enter more than one queue.
How can I do this so that it only has one ContactID per row. Also, for the Queue, is there anything I can do to ensure it pulls back the first Queue it enters? (These are time stamped). Subsequently, I would then need to add the second and third queue it enters in other columns. (A call can enter a maximum of 3 queues).
We find that a delete command on a table where the rows to be deleted involve an inner join between the table and a view formed with an outer join sometimes works, sometimes gives error 625.
If the delete is recoded to use the join key word instead of the = sign then it alway gives error 4425.
625 21 0 Could not retrieve row from logical page %S_PGID by RID because the entry in the offset table (%d) for that RID (%d) is less than or equal to 0. 1033 4425 16 0 Cannot specify outer join operators in a query containing joined tables. View '%.*ls' contains outer join operators. The delete with a correleted sub query instead of a join works.
Error 4425 text would imply that joins with view formed by outer joins should be avoided.
Is this possible? What I am looking for is something like:UPDATE T_SitesSET T_Sites.LastDate = T_Inspections.DateFROM T_SitesINNER JOIN T_Assets ON T_Sites.SiteID = T_Assets.AssetIDLEFT OUTER JOIN T_Insecptions ON T_Assets.AssetID = T_Inspections.AssetID-- But I need only the last inspection done on the site (including if it is null)
Until today, I was always under the impression that left vs. right was determined by which side of the comparison operator the table was located.
In other words: LEFT JOIN LeftTable.ID = RightTable.ID
would pull all the records from LeftTable and those that matched from from RightTable and that:
RIGHT JOIN RightTable.ID = LeftTable.ID
would pull exactly the same result set but I was wrong. So, if it is not the table position in relation to the comparison operator, is it simply that the tables listed first in the FROM clause aren the ones "Left" of those subsequently entered?
I'm trying to write a 3 table query using two LEFT JOINs. Originally, I only had one LEFT JOIN and prior to the addition of the the third table (parts) this query worked. Now it doesn't. I think it has to do with my GROUP BY.
SELECT quote.quote_id, parts.material, machining_operations.machine, machining_operations.per_roughing, machining_operations.per_of_machining, machining_operations.programming_time, machining_operations.setup_time, machining_operations.cycle_time, machining_operations.notes quote.part_name, quote.revision_no, quote.quantity, quote.initial_volume, quote.final_volume, quote.material_price, machining_operations.mo_id FROM quote LEFT JOIN machining_operations ON machining_operations.quote_num = quote.quote_id LEFT JOIN parts ON parts.package_no = quote.package_no AND parts.part_name = quote.part_name GROUP BY quote.quote_id
I'm only new to Reporting services and have just started working on a report model for ad hoc reporting.
I have around 50 tables, many of them related through FK's. How can I handle this when designing the model?
E.G
I have a Table called Posts, which has a Hospital ID which is an FK to the Hospitals table. A relationship exists between the two in my Data Source View, however I cannot access the Hospital Name (stored in the Hospital table) using the report builder.
Table structure is very simple as below and I know there are solutions with joins (Left outer joins), need to know if it is possible to get o/p without using joins
Note:- also need records who doesn't have manager (null)
Hello All & Thanks in advance for your help!Background:1) tblT_Documents is the primary parent transaction table that has 10fields and about 250,000 rows2) There are 9 child tables with each having 3 fields each, their ownPK; the FK back to the parent table; and the unique data for thattable. There is a one to many relation between the parent and each ofthe 9 child rows. Each child table has between 100,000 and 300,000rows.3) There are indexes on every field of the child tables (though Idon't believe that they are helping in this situation)4) The client needs to be presented a view that has 5 of the mainfields from the parent table, along with any and all correspondingdata from the child tables.5) The client will select this view by doing some pattern-matchingsearch on one of the child records' detail (e.g. field-name LIKE%search-item% - so much for the indexes...)Problem:When I do the simple join of just the parent with one of the children,the search works *fairly* well and returns the five parent fields andthe corresponding matching child field.However, as soon as I add any one of the other child records to simplydisplay it's unique data along with the previously obtained results,the resulting query hangs.Is the overall structure of the tables not conducive to this kind ofquery? Is this a situation where de-normalization will be required toobtain the desired results? Or, more hopefully, am I just an idiotand there is some simpler solution to this problem?!Thanks again for your assistance!- Ed
Hi,I'm having problems constructing a nested join. It's quite complex, sohere's a simplfied example of the problem. Any thoughts on what I'mdoig wrong - or if I've got the whole approach wrong are welcome.I've two tables :-one is a contact table contacting name, addresses etc. Three of thefields represent users - 'created by', 'last modified by' and 'owner'.They contain usernames - eg. JDOE, BSMITH etc.The other table contants usernames and new ID codes.What I want to do is create a new dataset by joining the contacts tablewith the user table on all three fields - so the new dataset containsthe ids for the creator, last modifier and owner.I've tried things similar to:select c.*, u1.id, u2,id, u3.idfrom contact cleft outer join users u1left outer join users u2left outer join users u3on (u3.username = c.owner)on (u2.username = c.modified)on (u1.username = c.creator )But it compains that"The column prefix 'c' does not match with a table name or alias nameused in the query."The problem is referencing c (contact) through the whole set of joins.I would like to do this in some similar format as the query is within acursor and post-processing would be very long-winded.Thanks
Employee table - This table has EmployeeID, Name, DOB.
EmployeeDesignation table - 1 Employee can have many designations with each having an effective date. There is no flag to indicate which among multiples is the current entry. You can only figure it out by the newest/oldest EffectiveDate. I want to get the most recent and the oldest for each employee.
EmployeeSalaryHistory table - Structure/Design is similar to EmployeeDesignation table. I want to get the starting salary and current salary for each employee.
I want my query to output me the following fields...
Currently, I have a query to get this done which looks as below. Since I have more than 8K employees with each having multiple Designation and Salary entries, my query is taking forever.
selecte.EmployeeID, e.EmployeeName, e.EmployeeDOB, (select top 1 Designation from @EmployeeDesignation ed where ed.EmployeeID = e.EmployeeID Order By EffectiveDate) EmployeeStartingDesignation, (select top 1 Designation from @EmployeeDesignation ed where ed.EmployeeID = e.EmployeeID Order By EffectiveDate Desc) EmployeeCurrentDesignation,
Hello, can anyone tell me if it is possible to conditionally join tables? If so, how could it be done?
What I would like to do is create a query similar to the one below but include the rows in the Asset table where the corresponding Alert field is NULL.
Assets AS A ON AL.IndustryId = A.IndustryId AND AL.RegionId = A.RegionId AND AL.RevenueId = A.RevenueId WHERE AlertId = 1
The output I am after would be the first row in the Assets table. But since the RevenueId column is NULL, I get nothing. The only time the above query will work is if all three Id columns are populated. That is not always going to be the case. Please don't suggest changing table structures or adding data. That is not an option.
Each one of the tables listed below has a “CreateDateTime” and “UpdateDateTime” fields, I need to get yesterday changes, I can get any record where either CreateDateTime or UpdateDateTime is greater than midnight yesterday butI need to watch dates on all of the tables so I need to do atleast 10 date checks.
If any table shows an updated or created record, I need to gather ALL of the information for that customer. So, if my name didn’t change (SCUS table), but my email does (SEML table), I have to pull out both the SCUS and SEML tables (and the others, of course). So It may not be simple WHERE clause, How can I achieve this:
SQL Server 2000Howdy All.Is it going to be faster to join several tables together and thenselect what I need from the set or is it more efficient to select onlythose columns I need in each of the tables and then join them together?The joins are all Integer primary keys and the tables are all about thesame.I need the fastest most efficient method to extract the data as thisquery is one of the most used in the system.Thanks,Craig
Why is it that SQL joins (*=) run a little faster as opposed to ANSI joins(LEFT JOIN...)? Aren't they supposed to be almost identical?
The issue is this: we are promoting using ANSI syntax for the obvious reason (future versions of SQL Server may not support SQL Server syntax; portability, etc.)
However, the problem is the speed. What have others done about this? Do you use ANSI syntax or SQL syntax? HOw true is it that future SQL Server versions may discontinue support for the '*=" and "=*' join operators.
I have four tables which I want to return results for an advanced search function, the tables contain different data, but can be quite easily joined,
Table A Contains a Main Image, this image is displayed in the results Table B Contains an Icon, this image is displayed in the results Table C doesn't have an image in it but has a child table with a number of images associated to the table, in the UNION ALL statement I would Like to do a Join to get say the top Image from this child and print it for the row associated with table C.
Select title, description, image from tableA UNION ALL Select title, description, icon as image from tableB UNION ALL title, description, ( inner Join SELECT top(1) from imageTableC where imagetableC.FK = tableC.PK) as image from tableC
Could someone show me the syntax to do this, I have all the information printing to the screen, bar this table C image.
I was writing a query using both left outer join and inner join. And the query was ....
SELECT S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname FROM Production.Suppliers AS S LEFT OUTER JOIN (Production.Products AS P INNER JOIN Production.Categories AS C
[code]....
However ,the result that i got was correct.But when i did the same query using the left outer join in both the cases
i.e..
SELECT S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname FROM Production.Suppliers AS S LEFT OUTER JOIN (Production.Products AS P LEFT OUTER JOIN Production.Categories AS C ON C.categoryid = P.categoryid) ON S.supplierid = P.supplierid WHERE S.country = N'Japan';
The result i got was same,i.e
supplier country productid productname unitprice categorynameSupplier QOVFD Japan 9 Product AOZBW 97.00 Meat/PoultrySupplier QOVFD Japan 10 Product YHXGE 31.00 SeafoodSupplier QOVFD Japan 74 Product BKAZJ 10.00 ProduceSupplier QWUSF Japan 13 Product POXFU 6.00 SeafoodSupplier QWUSF Japan 14 Product PWCJB 23.25 ProduceSupplier QWUSF Japan 15 Product KSZOI 15.50 CondimentsSupplier XYZ Japan NULL NULL NULL NULLSupplier XYZ Japan NULL NULL NULL NULL
and this time also i got the same result.My question is that is there any specific reason to use inner join when join the third table and not the left outer join.
Im having a problem with a statement i cannot seem to get 2 left joins working at the same time 1 works fine but when i try the second join i get this error:-
Microsoft OLE DB Provider for ODBC Drivers error '80040e14'
[Microsoft][ODBC Microsoft Access Driver] Syntax error (missing operator) in query expression 'children_tutorial.school_id=schools.idx LEFT JOIN regions ON children_tutorial.region_id=region.idx'.
My SQL statment is as follows :- SELECT children_tutorial.*,schools.schoolname,regions.rname FROM children_tutorial LEFT JOIN schools ON children_tutorial.school_id=schools.idx LEFT JOIN regions ON children_tutorial.region_id=region.idx
I am using an Access database i have tried all sorts to get it working and its driving me mad!! any help would be really appreciated.
