Use ANSI Join Or Old Style Join?
May 20, 2006
Hi,
Just curious. Would you use ANSI style table joining or the 'old
fashion' table joining; especially if performance is the main concern?
What I meant is illustrated below:
ANSI Style
select * from a join b on a.id = b.id
Old Style
select * from a, b where a.id = b.id
I noticed that in some SQL, the ANSI is much faster but sometimes, the
old style looks much better.
It's ridiculous to try out both styles to see which is better whenever
we want to write an SQL statement.
Please comment.
Thanks in advance.
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Oct 25, 2007
A question for everyone:
With the introduction of SQL 2005, we now have to use ANSI-92 T-SQL Syntax and I was wondering if anyone had written a tool to convert queries from old ANSI SQL to the new syntax.
We have some code that has to change for the outer joins, but we also have a lot of code that should change for the inner joins. It doesn't seem that difficult to write something that parses an old piece of code and at least suggests a new version. Especially if the conversion code wasn't SQL code.
Thanks, in advance,
Brian
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Oct 1, 2007
I've been using this syntax for years on SQL Server and now comes the time to convert to SQL 2005 (90 compatibility). This syntax returns four rows. Basically it returns one row for each servername/component/context/property/value even when there does not exist a property of 'fff' since it's a left join:
Code Block
select t1.* from tblconfiguration t1
,tblconfiguration t2
where t1.component = 'AdjProcessUtility'
and t1.servername *= t2.servername
and t1.component *= t2.component
and t1.context *= t2.context
and t1.property = 'proc'
and t2.property = 'fff'
Result:
SQLEDEV1 AdjProcessUtility DuplicatesReport Proc Adjustment.dbo.prcDuplicatesReport
SQLEDEV1 AdjProcessUtility ExtractAdjFile Proc Adjustment.dbo.prcAdjExtractMFFiles
SQLEDEV1 AdjProcessUtility ValidationProcess Proc prcAdjValidations
SQLEDEV1 AdjProcessUtility ValidationReport Proc Adjustment.dbo.prcValidationReport
When the converted (using SQL enterprise Mgr) runs it returns no rows:
Code Block
SELECT t1.*
FROM dbo.tblConfiguration t1 LEFT OUTER JOIN
dbo.tblConfiguration t2 ON t1.ServerName = t2.ServerName AND t1.Component = t2.Component AND t1.Context = t2.Context
WHERE (t1.Component = 'AdjProcessUtility') AND (t1.Property = 'proc') AND (t2.Property = 'fff')
I don't really see how to change this query to make it work. I've searched the web and I really don't see any examples of left joins which use more than one column.
Here's the table definition:
Code Block
CREATE TABLE dbo.tblConfiguration
(
ServerName VARCHAR(30) NOT NULL,
Component VARCHAR(255) NOT NULL,
Context VARCHAR(255) NOT NULL,
Property VARCHAR(255) NOT NULL,
CONSTRAINT PK_tblConfiguration PRIMARY KEY NONCLUSTERED( ServerName, Component, Context, Property ),
Value VARCHAR(255) NOT NULL
)
I use this table to define reports and there attribues. The rows repeat themselves except for the Property and Value columns
Here is some of the data:
SQLEDEV1 AdjProcessUtility ExtractAdjFile Proc Adjustment.dbo.prcAdjExtractMFFiles
SQLEDEV1 AdjProcessUtility ExtractAdjFile RunTime 13:25
SQLEDEV1 AdjProcessUtility ExtractAdjFile Schedule 2,3,4,5,6
SQLEDEV1 AdjProcessUtility ExtractAdjFile FixedRecLength 71
SQLEDEV1 AdjProcessUtility ExtractAdjFile WriteFileHeader Y
SQLEDEV1 AdjProcessUtility ExtractAdjFile WriteTempTable Y
SQLEDEV1 AdjProcessUtility ValidationProcess Proc prcAdjValidations
SQLEDEV1 AdjProcessUtility ValidationReport ReportClass ReportCSV
SQLEDEV1 AdjProcessUtility ValidationReport Ids Validation
SQLEDEV1 AdjProcessUtility ValidationReport RunTime 15:06
SQLEDEV1 AdjProcessUtility ValidationReport Schedule 2,3,4,5,6
SQLEDEV1 AdjProcessUtility ValidationReport DefaultFileName Adj_ValidationReport_MMDDYYHHMM.csv
etc.
Any help is greatly appreciated,
Sid
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Oct 24, 2001
How to use ANSI-standard JOIN to write follow query which contains two outer join ?
SELECT a.*,b.title as classification,c.title as
employees,d.username,d.password,d.role_id,d.status
FROM DBO.PROFILE a,DBO.classification b,DBO.employee c ,DBO.USER d
WHERE a.user_id = 1 and a.employee_id *=c.id and a.classification_id *=b.id
and d.id= 1
Many thanks
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Jan 11, 2005
Having problems rewriting my join condition using the "inner join" syntax.
My query, working with an intersection table:
SELECT Description, EmailAddress
FROM Accounts_Roles r, Accounts_Users u, Accounts_UserRoles ur
WHERE
r.RoleID = ur.RoleID
AND
u.UserID = ur.UserID
This works fine, but i want to write it using 'inner join' style, so I tried:
SELECT Description, EmailAddress
FROM Accounts_Roles r, Accounts_Users u
INNER JOIN Accounts_UserRoles ur
ON
r.RoleID = ur.RoleID
AND
u.UserID = ur.UserID
which gives me an error (The column prefix 'r' does not match with a table name or alias name used in the query.)
Any ideas as to how I'm screwing this up would be appreciated.
Thanks,
Gordon Z
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Jul 20, 2005
Help!I'm trying to understand the new ANSI join syntax (after many years ofcoding using the old style). I am now working with an application that onlyunderstands ANSI syntax so I am struggling.My first (old style syntax) SQL statement below produces 60 rows:SELECT A1.CONTACTID, A1.LASTNAME, A1.FIRSTNAME, A1.ACCOUNT,A6.CITY, A6.STATE, A1.WORKPHONE, A1.FAX, A1.EMAILFROM CONTACT A1,ADDRESS A6WHERE A1.ADDRESSID=A6.ADDRESSIDAND A1.CONTACTID IN(SELECT A4.CONTACTIDFROM CONTACT_LEADSOURCE A4,LEADSOURCE A5WHERE A4.LEADSOURCEID = A5.LEADSOURCEIDAND A5.DESCRIPTION = 'some_description' )AND A1.CONTACTID IN(SELECT A2.CONTACTIDFROM TICKET A2,ENROLLHX A3,EVENT A7WHERE A3.STATUS IN ('R', 'Confirmed')AND A2.TICKETID = A3.EVXEVTICKETIDAND A3.EVENTID = A7.EVENTIDAND A7.CODE IN('AHS00','AHS01','AHS02','AHS03','AHS04','AHS98',' AHS99'))ORDER BY A1.LASTNAME ASCI am trying to convert this to the newer ANSI sytax. My second SQL statementbelow produces 67 rows (duplicates):SELECT A1.CONTACTID, A1.LASTNAME, A1.FIRSTNAME, A1.ACCOUNT,A6.CITY, A6.STATE, A1.WORKPHONE, A1.FAX, A1.EMAILFROM CONTACT A1JOIN ADDRESS A6 ON (A1.ADDRESSID=A6.ADDRESSID)JOIN( SELECT C.CONTACTIDFROM CONTACT CJOIN CONTACT_LEADSOURCE A4 ON (C.CONTACTID= A4.CONTACTID)JOIN LEADSOURCE A5 ON (A4.LEADSOURCEID =A5.LEADSOURCEIDAND A5.DESCRIPTION ='some_description' )) AS C1 ON C1.CONTACTID = A1.CONTACTIDJOIN(SELECT C2.CONTACTIDFROM CONTACT C2JOIN TICKET A2 ON (C2.CONTACTID =A2.CONTACTID)JOIN ENROLLHX A3 ON (A2.TICKETID =A3.TICKETID AND A3.STATUS in ('R', 'Confirmed'))JOIN EVENT A7 ON (A3.EVENTID = A7.EVENTIDAND A7.CODE IN ('AHS00','AHS01','AHS02','AHS03','AHS04','AHS98',' AHS99')))AS C3 ON C3.CONTACTID = A1.CONTACTIDCan anyone shed some light on what I am missing?cheers,Norm
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Apr 30, 2008
Hello
Can any one tell me the difference between Cross Join, inner join and outer join in laymans language
by just taking examples of two tables such as Customers and Customer Addresses
Thank You
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May 22, 2015
I have two xml source and i need only left restricted data.
how can i perform left restricted join?
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Oct 8, 2015
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.
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Dec 23, 2014
I have two select statements, in between select statement taking UNION ALL . I need to avoid the error
Warning: The join order has been enforced because a local join hint is used.
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Aug 10, 2007
Scenario:
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?
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Apr 14, 2015
I'm having trouble with a multi-table JOIN statement with more than one JOIN statement.
For each order, I need to return the following: CarsID, CarModelName, MakeID, OrderDate, ProductName, Total ordered the Car Category.
The carid (primary key) and carmodelname belong to the Cars table.
The makeid and orderdate belong to the OrderDetails table.
The productname and carcategory belong to the Product table.
The number of rows returned should be the same as the number of rows in OrderDetails.
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Aug 9, 2013
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?
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Jun 5, 2006
I have a merge join (full outer join) task in a data flow. The left input comes from a flat file source and then a script transformation which does some custom grouping. The right input comes from an oledb source. The script transformation output is asynchronous (SynchronousInputID=0). The left input has many more rows (200,000+) than the right input (2,500). I run it from VS 2005 by right-click/execute on the data flow task. The merge join remains yellow and the task never finishes. I do see a row count above the flat file destination that reaches a certain number and seems to get stuck there. When I test with a smaller file on the left it works OK. Any suggestions?
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Jul 25, 2007
I'm using SQL Server 2005.
A piece of software I wrote starting timing out on a query that left outer joins a table to a view. Both the table and view have approximately the same number of rows (about 170000).
The table has 2 very similar columns, one is a varchar(1) and another is varchar(100). Neither are included in any index and beyond the size difference, the columns have the same properties. One of the employees here uses the varchar(1) column (called miscsearch) to tag large sets of rows to perform some action on. In this case, he had set 9000 rows miscsearch value to "g". The query then should join the table and view for all rows where miscsearch is set to g in the table. This query takes at least 20 minutes to run (I stopped it at this point).
If I remove the "where" clause and join all rows in the two tables, the query completes in about 20 seconds. If set the varchar(100) column (called descrip) to "g" for the same rows set via miscsearch, the query completes in about 20 seconds.
If I force the join type to a hash join, the query completes using miscsearch in about 30 seconds.
So, this works:
SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER HASH JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE miscsearch = 'g' ORDER BY balance DESC
and this works:
SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE descrip = 'g' ORDER BY balance DESC
But this does't:
SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE miscsearch = 'g' ORDER BY balance DESC
What should I be looking for here to understand why this is happening?
Thanks,
john
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Apr 24, 2007
Awesome! I don't alway get the email notification of whoever reply to the posting. I think it only work after I log off of the forum.
Scott
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Dec 24, 2013
We are trying to migrate from sql 2005 to 2012. I am changing one of the implicit join to explicit join. As soon as I change the join, the number of rows returned are fewer than before.
Below is my Implict join query
INSERT #RIF_TEMP1 (rf1_row_no,rf1_rif, rf1_key_id_no, rf1_last_date, rf1_start_date)
SELECT currow.rf0_row_no, currow.rf0_rif, currow.rf0_key_id_no, prevrow.rf0_start_date, currow.rf0_start_date
FROM #RIF_TEMP0 currow , #RIF_TEMP0 prevrow
[Code] ....
and below is explict join query
INSERT #RIF_TEMP1 (rf1_row_no,rf1_rif, rf1_key_id_no, rf1_last_date, rf1_start_date)
SELECT currow.rf0_row_no, currow.rf0_rif, currow.rf0_key_id_no, prevrow.rf0_start_date, currow.rf0_start_date
FROM #RIF_TEMP0 currow LEFT JOIN #RIF_TEMP0 prevrow
ON (currow.rf0_row_no = prevrow.rf0_row_no + 1)
[Code] ....
the count returned from both the queries is different.
I am not sure what am I doing wrong. The count of #RIF_TEMP0 is always 32, it never changes, but the variable @countTemp is different for both the queries.
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Feb 5, 2015
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]
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Aug 17, 2007
Hi guys,
I'll appreciate any help with the following problem:
I need to retrieve data from 3 tables. 2 master tables and 1 transaction table.
1. Master table TBLOC contain 2 records :
rcd 1. S01
rcd 2. S02
2. Master table TBCODE contain 5 records:
rcd 1. C1
rcd 2. C2
rcd 3. C3
rcd 4. C4
rcd 5. C5
3. Transaction table TBITEM contain 4 records which link to 2 master table:
rcd 1. S01, C1, CAR
rcd 2. S01, C4, TOY
rcd 3. S01, C5, KEY
rcd 4. S02, C2, CAR
I use Left Join & Right Join to retrieve result below (using non-ASNI method) but it doesn't work.
Right Join method:
SELECT C.LOC, B.CODE, A.ITEM FROM TBITEM A RIGHT JOIN TBCODE B ON A.CODE = B.CODE
RIGHT JOIN TBLOC C ON A.LOC = C.LOC
GROUP BY C.LOC, B.CODE, A.ITEM ORDER BY C.LOC, B.CODE
When I use Non-ASNI method it work:
SELECT C.LOC, B.CODE, A.ITEM FROM TBITEM A, TBCODE B, TBLOC C
WHERE A.CODE =* B.CODE AND A.LOC =* C.LOC
GROUP BY C.LOC, B.CODE, A.ITEM ORDER BY C.LOC, B.CODE
Result:
LOC CODE ITEM
-----------------------------
S01 C1 NULL
S01 C2 NULL
S01 C3 CAR
S01 C4 TOY
S01 C5 KEY
S02 C1 NULL
S02 C2 CAR
S02 C3 NULL
S02 C4 NULL
S02 C5 NULL
Please Help.
Thanks.
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Nov 7, 2006
Is there a way to do a super-table join ie two table join with no matching criteria? I am pulling in a sheet from XL and joining to a table in SQLServer. The join should read something like €œfor every row in the sheet I need that row and a code from a table. 100 rows in the sheet merged with 10 codes from the table = 1000 result rows.
This is the simple sql (no join on the tables):
select 1.code, 2.rowdetail
from tblcodes 1, tblelements 2
But how to do this in SSIS?
Thanks - Ken
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May 6, 2008
I read that merge joins work a lot faster than hash joins. How would you convert a hash join into a merge join? (Referring to output on Execution Plan diagrams.)
THANKS
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Apr 17, 2007
There is a table called "tblvZipCodes" that contain a zipcode of all cities, area code that are located in that zip code.
The problem I have with the inner join is that there are more than 1 cities in one zipcode code. Is there a way to just return only the 1st row and not return the rest of the rows from the tblvZipCodes in the INNER JOIN query?
Thanks..
Code:
SELECT TOP 100 PERCENT dbo.tblPurchaseRaw.Year, dbo.tblPurchaseRaw.Make, dbo.tblPurchaseRaw.Model, dbo.tblPurchaseRaw.ModelType,
dbo.tblPurchaseRaw.Color, dbo.tblvZipCodes.ZIPCode, dbo.tblvZipCodes.City, dbo.tblvZipCodes.County, dbo.tblvZipCodes.State,
dbo.tblvZipCodes.AreaCode, dbo.tblvZipCodes.Region, dbo.tblaAccounts.Name, dbo.tblaAccounts.PhoneOne, dbo.tblaAccounts.AccountID,
dbo.tblPurchaseRaw.AcceptedID, dbo.tblPurchaseRaw.Series, dbo.tblPurchaseRaw.BodyStyle, dbo.tblaAccounts.WebSite,
dbo.tblaAccounts.SalesEmail, dbo.tblPurchaseRaw.EmailTo, dbo.tblPurchaseRaw.PhotoURL, dbo.tblPurchaseRaw.Mileage,
dbo.tblPurchaseRaw.RawID, dbo.tblvRegions.Name AS RegionName, dbo.tblPurchaseRaw.VIN, dbo.tblPurchaseRaw.Style,
dbo.tblPurchaseRaw.StockDate
FROM dbo.tblPurchaseRaw INNER JOIN
dbo.tblaAccounts ON dbo.tblPurchaseRaw.AccountID = dbo.tblaAccounts.AccountID INNER JOIN
dbo.tblvZipCodes ON dbo.tblPurchaseRaw.ZipCode = dbo.tblvZipCodes.ZIPCode INNER JOIN
dbo.tblvRegions ON dbo.tblvZipCodes.Region = dbo.tblvRegions.RegionID
WHERE (CONVERT(char, dbo.tblPurchaseRaw.StockDate, 101) <> '01/01/1900') AND (dbo.tblPurchaseRaw.SoldRawID IS NULL) AND
(dbo.tblPurchaseRaw.AcceptedID <> - 10) AND (dbo.tblPurchaseRaw.AcceptedID <> - 1)
ORDER BY dbo.tblvZipCodes.ZIPCode
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Mar 1, 2008
hello, i am running mysql server 5 and i have sql syntax like this:
select
sales.customerid as cid,
name,
count(saleid)
from
sales
inner join
customers
on
customers.customerid=sales.customerid
group by
sales.customerid
order by
sales.customerid;
it works fine and speedy. but when i change inner join to right join, in order to get all customers even there is no sale, my server locks up. note: there is about 10000 customers and 15000 sales.
what can be the problem?
thanks,
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Jan 2, 2006
I have 2 tables, I will add sample data to them to help me explain...Table1(Fields: A, B)=====1,One2,Two3,ThreeTable2(Fields: A,B)=====2,deux9,neufI want to create a query that will only return data so long as the key(Field A) is on both tables, if not, return nothing. How can I dothis? I am thnking about using a 'JOIN' but not sure how to implementit...i.e: 2 would return data- but 9 would not...any help would be appreciated.
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Jun 28, 2007
Hello, everyoneI have one question about the standard join and inner join, which oneis faster and more reliable? Can you recommend me to use? Please,explain me...ThanksChamnap
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Oct 10, 2007
Given a table of building components e.g. floors, walls, etc, etc:
create table component_multiplier_table
(
system_code char(4),
system_component_code char(3),
function_code char(4),
component_multiplier dec(7,6)
)
Where function_code is the function of the area e.g. Auditorium, Classrom, etc, etc. And not all components are available for all functions e.g. Carpeting is available for Classrooms but not Power Plants or Warehouses.
I need to self join the above table to itself on system_code and system_component_code and find out which rows are missing from each side.
A query that I've been banging away at with no success is:
SELECT c1.*, c2.*
FROM [dbo].[component_multiplier_table] c1 FULL OUTER JOIN [dbo].[component_multiplier_table] c2
ON (c1.system_component_code = c2.system_component_code) AND (c1.[system_code] = c2.[system_code])
WHERE c1.function_code = '2120' AND c2.[function_code] = '2750' AND (c1.[system_code] IS NULL OR c2.system_code IS NULL);
I added the is null conditions, no joy. I've tried every flavor of outer join w/o success.
Could any T-SQL gurus out there help me figure out how to do this in a set before I start coding
DECLARE crsr CURSOR
Thanks.
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Apr 16, 2008
Anyone know why using
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".
Any enlightenment is very appreciated.
Thanks
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Apr 26, 2002
Take the following scenario:
We have two tables that have somewhat of a parent-child relationship. We are trying to use a SQL-92 outer join that returns the same results as a TSQL *= outer join. The difficulty we are having is that some of the parent records do not have any corresponding child records, but we still want to see those parent records with 0 (zero) for the count. How can we accomplish this with a SQL-92 compliant join (if it is even possible)? In the query results below, we would like the first set of results.
Thanks in advance for any help.
-David Edelman
Test script below, followed by results
===========================================
create table parent (p_id int NOT NULL)
go
create table child (p_id int NOT NULL, c_type varchar(6) NULL)
go
insert parent values (1)
insert parent values (2)
insert parent values (3)
insert parent values (4)
insert parent values (5)
insert parent values (6)
insert parent values (7)
insert parent values (8)
insert parent values (9)
insert parent values (10)
go
insert child values (1, 'AAA')
insert child values (1, 'BBB')
insert child values (1, 'CCC')
insert child values (2, 'AAA')
insert child values (4, 'AAA')
insert child values (4, 'DEF')
insert child values (4, 'AAA')
insert child values (4, 'BBB')
insert child values (5, 'AAA')
insert child values (5, 'AAA')
insert child values (6, 'AAA')
insert child values (7, 'AAA')
insert child values (7, 'BBB')
insert child values (7, 'CCC')
insert child values (7, 'DDD')
insert child values (10, 'AAA')
insert child values (10, 'CCC')
go
select p.p_id, count(c.p_id) as num_rows
from parent p, child c
where p.p_id *= c.p_id
and c.c_type in ('AAA', 'BBB')
group by p.p_id
select p.p_id, count(c.p_id) as num_rows
from parent p left outer join child c on p.p_id = c.p_id
where c.c_type in ('AAA', 'BBB')
group by p.p_id
=========================================
Results:
(T-SQL *= outer join)
p_id num_rows
----------- -----------
1 2
2 1
3 0
4 3
5 2
6 1
7 2
8 0
9 0
10 1
(SQL-92 outer join)
Warning: Null value eliminated from aggregate.
p_id num_rows
----------- -----------
1 2
2 1
4 3
5 2
6 1
7 2
10 1
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Sep 30, 2005
Hello,
Could someone please explain the following sel statement to me please:
SELECT * FROM userdata UD
join useroffice UO on UO.USER_ID = UD.PK
join officedata OD on OD.pk = UO.OFFICE_ID
left join usertitle1 UT on UT.PK = UD.fk_user_title1
WHERE UD.PK = 451
ORDER BY UD.pk
I understand that the joins are just brining data that is related the a particular filed but why the LEFT JOIN???
Thanks
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Nov 2, 2007
Hello,
I have this table called "Playlist_Items". It has different "media types" in it. An MP3 is "1", a video is "2", etc.
I want to make a query that gets all the items in the playlist and gets common properties between them, like the name, user, etc.
The only problem is that the tables aren't normalized, so I have to do something like, if the "MediaType" is 1 then look in the MP3 table and get this column, otherwise if its 2 then look in the video table. Etc.
I have no idea how to do this in SQL... :/
Here is a diagram of my tables:
Thanks very much!
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Jun 25, 2007
Hi,
This is a sample database table
TableA
============================
aID int identity(1,1) primary key
aName varchar(30)
TableB
===========================
bID int identity(1,1) primary key
bTitle varchar(30)
aID int references TableA(aID)
TableC
===========================
cID int indentity(1,1) primary key
cCategory varchar(30)
bID int references TableB(bID)
Here I got two query, are them the same?
Select A.aName, B.bTitle, C.cCategory
From TableA A, TableB B, TableC C
Where A.aID = B.aID And B.bID = C.cID
and
Select A.aName, B.bTitle, C.cCategory
From TableA A Join TableB B On A.aID=B.aID
Join TableC On B.bID=C.cID
Are those two the same?
And what is the different of JOIN and LEFT OUTER JOIN? Any other JOIN?
Millions Thanks!
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Jul 3, 2006
Hi,I have 2 tables: tblStatements and tblLines (one to many) AnytblStatements record can have many associated records in tblLines.The search criteria is against tblLines (ie tblLines.fldDateofService
Quote:
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Oct 5, 2006
Hi everyone.. can anyone help me on how to solve my problem regarding on Select.. im using PB6.5 and running on MSSLQ2005 database.. i attached an image for your reference.. thnks!
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