Why would I use a left join instead of a inner join when the columns entered within the SELECT command determine what is displayed from the query results?
The select command below will output one patient’s information in 1 row:
Patient id Last name First name Address 1 OP Coverage Plan 1 OP Policy # 1 OP Coverage Plan 2
[code]...
This works great if there is at least one OP coverage. There are 3 tables in which to get information which are the patient table, the coverage table, and the coverage history table. The coverage table links to the patient table via pat_id and it tells me the patient's coverage plan and in which priority to bill. The coverage history table links to the patient and coverage table via patient id and coverage plan and it gives me the effective date.
select src.pat_id, lname, fname, addr1, max(case when rn = 1 then src.coverage_plan_ end) as OP_Coverage1, max(case when rn = 1 then src.policy_id end) as OP_Policy1,
SELECT * FROM a LEFT OUTER JOIN b ON a.id = b.id instead of
SELECT * FROM a LEFT JOIN b ON a.id = b.id
generates a different execution plan?
My query is more complex, but when I change "LEFT OUTER JOIN" to "LEFT JOIN" I get a different execution plan, which is absolutely baffling me! Especially considering everything I know and was able to research essentially said the "OUTER" is implied in "LEFT JOIN".
Hi again, I have this SQL (part of a stored procedure) where I do LEFT JOIN. SELECT callingPartyNumber, AlertingName, originalCalledPartyNumber, finalCalledPartyNumber, dateTimeConnect, dateTimeDisconnect, CONVERT(char(8), DATEADD(second, duration, '0:00:00'), 108) AS duration, clientMatterCode
FROM CDR1.dbo.CallDetailRecord t1 LEFT JOIN CDR2.dbo.NumPlan t2 ON t1.callingPartyNumber=t2.DNorPattern
WHERE (t1.callingPartyNumber LIKE ISNULL(@callingPartyNumber, t1.callingPartyNumber) + '%') AND (t1.originalCalledPartyNumber LIKE ISNULL(@originalCalledPartyNumber, t1.originalCalledPartyNumber) + '%') AND (t1.finalCalledPartyNumber LIKE ISNULL(@finalCalledPartyNumber, t1.finalCalledPartyNumber) + '%') AND (t1.clientMatterCode LIKE ISNULL(@clientMatterCode, t1.clientMatterCode) + '%') AND (@callerName is NULL OR t2.AlertingName LIKE '%' + @callerName + '%') AND (t1.duration >= @theDuration) AND ((t1.datetimeConnect) >= ISNULL(convert(bigint, datediff(ss, '01-01-1970 00:00:00', @dateTimeConnect)), t1.datetimeConnect)) AND ((t1.dateTimeDisconnect) <= ISNULL(convert(bigint, datediff(ss, '01-01-1970 00:00:00', @dateTimeDisconnect)), t1.dateTimeDisconnect)) The problem is that if the t2 has more than one entry for the same DNorPattern, it pulls the record more than once. So say t1 has a callingPartyNumber = 1000. t2 has two records for this number. It will pull it more than once. How do I get the Unique value. What I am trying to get is the AlertingName (name of the caller) field value from t2 based on DNorPattern (which is the phone number). If this is not clear, please let me know. Thanks, Bullpit
I think it is quite often when you need to view some records, which refer (by key) to data in other tables. For instance, a user belongs to a group but it is preferable to show group name in the user data rather than group id. The options are
1) LEFT OUTER JOIN: SELECT users.id, groups.name FROM users LEFT OUTER JOIN groups ON users.[group] = groups.id
2) A Subselect: SELECT id, [group] = (SELECT [name] FROM groups WHERE id = users.[group]) FROM users
SELECT U.UserFamilyName, F.FamilyName FROM Users U LEFT JOIN User_Friends F ON U.UserID = F.UserID WHERE U.UserName = ‘JOHN’
How do I adjust my query to select just the very first record from Users_friends, I want only the top first one.And if there are no friends how can I return an empty string instead of Null.
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.
OLEDB source 1 SELECT ... ,[MANUAL DCD ID] <-- this column set to sort order = 1 ... FROM [dbo].[XLSDCI] ORDER BY [MANUAL DCD ID] ASC
OLEDB source 2 SELECT ... ,[Bo Tkt Num] <-- this column set to sort order = 1 ... FROM ....[dbo].[FFFenics] ORDER BY [Bo Tkt Num] ASC
These two tasks are followed immediately by a MERGE JOIN
All columns in source1 are ticked, all column in source2 are ticked, join key is shown above. join type is left outer join (source 1 -> source 2)
result of source1 (..dcd column) ... 4-400-8000119 4-400-8000120 4-400-8000121 4-400-8000122 <--row not joining 4-400-8000123 4-400-8000124 ...
result of source2 (..tkt num column) ... 4-400-1000118 4-400-1000119 4-400-1000120 4-400-1000121 4-400-1000122 <--row not joining 4-400-1000123 4-400-1000124 4-400-1000125 ...
All other rows are joining as expected. Why is it failing for this one row?
Why does this right join return the same results as using a left (or even a full join)?There are 470 records in Account, and there are 1611 records in Contact. But any join returns 793 records.
select Contact.firstname, Contact.lastname, Account.[Account Name] from Contact right join Account on Contact.[Account Name] = Account.[Account Name] where Contact.[Account Name] = Account.[Account Name]
I have experienced problems issuing SQL containing multiple joins through an ODBC connection. I read a thread here, which suggested an alternative to using multiple joins, this I tried and it appears to work. The code is as follows:
SELECT tblCust.AccountNo, tblCust.SalesMan, tblCust.AccManager, MAX(CASE WHEN SalesRep.Rowid = tblCust.SalesMan THEN SalesRep.Name END) AS SalesManNa, MAX(CASE WHEN SalesRep.Rowid = tblCust.AccManager THEN SalesRep.Name END) AS AccManNa FROM Customers tblCust INNER JOIN SalesRep ON tblCust.SalesMan = SalesRep.Rowid OR tblCust.AccManager = SalesRep.Rowid WHERE (RowID = '1126318') GROUP BY tblCust.AccountNo, tblCust.SalesMan, tblCust.AccManager
However, I would like to know how efficient such code is compared to my original (and problematic) joining.
The following is a summary of my original problem
I have one view (Customers) and a table (SalesRep). Customers contains a list of customer companies, while SalesRep lists internal staff. Each company record has fields to identify a Sales contact and an Account Manager, both of which would be listed within the SalesRep table and could be the same person.
It seems fairly straightforward, we are using two INNER JOIN's between the tables, as follows simplified query shows:
SELECT tblCust.AccountNo, tblCust.SalesMan, tblCust.AccManager, salesRepTbl1.Name AS SalesManNa, salesRepTbl2.Name AS AccManNa FROM Customers tblCust INNER JOIN SalesRep salesRepTbl1 ON tblCust.SalesMan = salesRepTbl1.Rowid INNER JOIN SalesRep salesRepTbl2 ON tblCust.AccManager = salesRepTbl2.Rowid WHERE (tblCust.Rowid = '1126318')
This works fine when executed on SQL Server, as following result:
However, when issued using ASP through an ODBC connection to an Intersystems Cache database - SalesManNa is showing the result expected for AccManNa, as...
Interestingly, the above query does not return any results when executed through Vis Web Dev 2005 Express.
We are using a DSN for the connection, which uses the InterSystems Cache ODBC driver (5.2.0.329.0). I have tried many variations on the join and different syntax but no success and I'm not privy to any specific ODBC restrictions.
Any pointers as to what may be causing the problem through ODBC would be greatly appreciated as would any opinion of the efficiency of the working solution.
I'm trying to join 2 tables. I thought I was getting the correct results but it turns out I'm not. My Query: SELECT IVINVA, IVORDN, IVCSLN, IVRESR, IVCITM, CONVERT(varchar(12),CAST(IVIAMT as money),1) AS ExtPrice, CONVERT(varchar(12),CAST(IVPIVC as money),1) AS DistPrice, IVCSUM, IVQYCS, IVDESC, OIRESR, OIDPCT, CONVERT(varchar(12),CAST(IVPIVC - (OIDPCT / 100 * IVPIVC) as money),1) AS NetPrice FROM INVDET1_TBL LEFT JOIN ORDDIS_TBL ON ORDDIS_TBL.OIORDN = INVDET1_TBL.IVORDN AND ORDDIS_TBL.OIRESR = INVDET1_TBL.IVRESR WHERE IVORDN = '0859919' AND IVINVA = '00324024' Basically, my problem lies in the seonc condition of the LEFT JOIN. I needed to set the two tables equal my item number, because in some situations I need that logic to get the correct result. It most other cases, that item column in the ORDDIS_TBL is NULL, thus giving me the wrong results. In that case, I would want the JOIN to only be ORDDIS_TBL.OIORDN = INVDET1_TBL.IVORDN, and not include the second part. Is there a way I can condition this with an If statement, If ORDDIS_TBL.OIRESR is Null then do this join, if not, then do this? I'm confused how to get the proper result here.
3) select p.komorka,isnull(sum(ustalenia),0) from #plantemp p left join analiza_1 a on p.komorka=a.komorka where a.koniec between '20040701'and '20040731' group by p.komorka
komorka ustalenia (sum)
08.0000 SI/1788138.9300 SI/262856.8900
I need all rows from table 1 bat right and left join gives me the same results, WHY
As you can see the ParentIndexID and ChildIndexID fields refer to tblIndices.IndexID I would like a stored procedure as follows: show all index names and show the wights for the indexID you passed. This is what I have so far and it is not correct yet. Not sure what the syntax should be.
alter PROCEDURE [dbo].[uspBasketIndices_Get]
@IndexIDint
AS
select i.IndexID, i.[Name], bc.Weight from tblIndices as i left join tblBasketConstituents as bc on i.IndexID = bc.ParentIndexID and i.IndexID = @IndexID order by i.[Name]
Any one know any facts and figures about maximum Left Joins allowed (or recommended) in one query?
I am running a MS SQL 2000 my database is full of relational data and most of my foreign keys (INT data type) are a Clustered Indexed, Usually I will only be pulling one record from collection of about a dozen tables, but the Database is expected to grow fast and become big.
Right now I have a Stored Proc that has eight(8) LEFT JOINs in it. My worry is that this query will kill me as the database approaches 50,000 records.
Hi all. My query works fine, it generates reports but not my expected result.
select d.fullname, p.nickname, p.birthdate, p.birthplace, p.gender, p.civilstatus, p.religion, p.nationality, p. weight, p.height, p.haircolor, p.eyecolor, p.complexion, p.bodybuilt, p.picture, p.dialectspoken, d.mobilephone, d.prprovince,[Age] = dbo.F_AGE_IN_YEARS( birthdate, getdate() ), c.name, c.address, c.telno, c.email, c.occupation, ed.year1, ed.year2, ed.degree, sch.schname from hremployees as e inner join psdatacenter as d on e.empdcno = d.dcno inner join pspersonaldata as p on e.empdcno = p.dcno left join hrappempcharrefs as c on e.empdcno = c.empdcno left join hrappempeducs as ed on e.empdcno = ed.empdcno left join hrsetschools as sch on ed.schoolcode = sch.schcode
the above query gives a 77 records
if i ran "select * from hremployees" generates 60 records
i think the error is in the left joining. hrappempcharrefs, hrappempeducs and hrsetschools must be left joined to hremployees.
Hi Guys, I started working with linq and vb9.0 but i have a small problem i could feagure how to solve in c# but not in vb I wanted to make left join or right join on vb 9.0 and linq is it possible or this is only c# feature ? Waiting to hear from u guys, Thanks Softy
Hello! I need to write a query using left outer join and I'm having trouble with it. I have 2 tables:customer and cust_info. I want to pull all records from customer table and cust_info table even if there is no related data in cust_info table. But I need one condition in this query:only records from customer table where cus_type in ("A","B","C"). I don't need all other types ("D","E").
So my query looks like this:
select customer.cus_name,customer.cus_address,customer.cu s_type,cus_info.status from customer left outer join cus_info ON customer.sxdat_pk = cus_info.sxdat_pk and cus_type in ("A","B","C") AND cus_info.cus_table = 'CUSTOMER'
The result should be like this:
cus_name cus_address cus_type status Amoco 457 bent A new Bingo 47 lone oak C NULL Sears 1020 Magic dr. B exist
But my query pulls records for customers with type "D" and "E" that I'm trying to exclude from result.
I have to left join 2 tables. The first consists of columns:id, description, descr_num. The second table: id, descr_num, value.
I need to extract description from table1 where descr_num is in the range , say, 1-10.
LEFT JOIN
extract value from table2 ,descr_num should be in the same range. in table2 some values from (1,10) and desc_num could be not present. BUT i want this left join to be limited as i said.
Is there any solution to this prob. without creating temp tables. Or actually can i do such a join? Thank you
To join the table but MUST follow the condition as bitActiv = TRUE: select emp.nvcEmpName, emp.nvcEmpAddress, ety. nvcEmployeeType from cst_EmpProfile emp left join cst_EmpType on emp.intEmployeeTypee = ety.intEmpType and emp.bitActiv = 1.
But, the sql statement doesnt output the my expected result. Because the data row return must be 1st and 2nd row as it bitActiv = true. So, how's I going achieve what i want. tq.
Hi, I'm getting the error Syntax error (missing operator) in query expression 'dbPWork.id = dbPWorkWord.work_id LEFT JOIN words ON dbPWorkWord.word_id = words.id'." on the query below. Everything looks in place to me. Do you see anything that shouldn't work?
Query:
Code:
Code:
SELECT DISTINCT dbPWork.id, description_e as description, w_id , dateStart, dateEnd FROM dbPWork LEFT JOIN dbPWorkW ON dbWork.id = dbPWorkW.work_id LEFT JOIN words ON dbPWorkW.word_id = words.id
Everything works fine until I add the second LEFT JOIN statement. Any ideas? I'm stumped.
Hi, Iwant to make a left join between two tables connected with a specific field but I also want to have some criteria on the right table. I want to display all the rows from the first(left) table and only the rows from the secod (right) table that match the join and the criteria. However If I have criteria on the second table the join behaves like an inner join displaying only the rows that exist in both tables. In MS Access instead of the right table I use a query in which I enter the criteria and then I connect it with a left join in a new query in order to get the right results. How can I do itin MSSQLServer without using Views? Must I use a subquery with Exists and what is the right syntax in order to achieve this?
a job can be done with 1 or more operators I want to be able to show user both assigned and unassigned operator on the front end on a certain job so I haev only parm being passed in @jobID.
How do I got about showing all the operators but somehow differentiate ones already assigned to job
select a.[Cuno], [doc_type], [Doc_name] from [assembly] a left join [assembly_Doc] doc ON a.id = doc.assembly_id left join [assembly_Recog] re ON a.id = re.assembly_id where [activate] =1 and doc.doc_type = 1
I only have two records for doc_type =1 in the [assembly_Doc] table. Without joining the third table [assembly_Recog], the results is corrected, 2 records returned. I need to join with [assembly_Recog] table, but when it joined, I got the duplicate records. It listed twice. pls see the results below:
