Order Of GROUP BY - Does It Matter?
Oct 23, 2006Does the order of columns make a difference in the GROUP BY?
Woulde GROUP BY A, B, C
return different results than
GROUP BY C,A,B ?
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Does Column Order Really Matter?
Sep 11, 2006Does column order really matter for Query Optimizer to pick index.Case 1: Say my CUSTOMER table has one composite index containing FirstName and LastName. FirstName exists prior than LastName. Does the column, FirstName and LastName, order matter to have Query Optimizer to utilize the index when I write WHERE clause in a SELECT statement?Statement 1:SELECT * FROM CUSTOMER WHERE FirstName = 'John' and LastName ='Smith'Statement 2:SELECT * FROM CUSTOMER WHERE LastName ='Smith' and FirstName = 'John' Will both statement 1 and 2 use the composite index or only statement 1?Case 2:Say my CUSTOMER has two single-column indexes. One index is on column FirstName. Another is on column LastName.For statement 1 and 2 above, which index will be picked by Query Optimizer or both? How does QO pick for index?I read couple book and some books say column order matter but some say no. Which one should I go with? I'm kind of confused.
View 2 Replies View RelatedDoes Column Order Matter When Creating A Table?
Mar 16, 2001Does column order matter when creating a table? For example, Should NOT NULL columns always come before NULL columns? Should most frequently used columns always be near the top? What about text, ntext and image data types? Should they always appear near the end of the column order?
View 1 Replies View RelatedSQL Server 2008 :: Get Max Of Group No Matter Currency
Aug 5, 2015I have this data below :
isin | market | ccy| stock_mkt | max(a.year) | max(a.month ) | max(a. day)
DEX | XFFA | DEM | 013 | 2009 | 5 | 8
DEX | XFFA | EUR | 013 | 2014 | 11 | 25
get this data by running the following query :
select b.isin, a.market, a.ccy, a.stock_mkt, max(a.year)
,max(a.month), max(a.day) from market_table a inner join
isin_table b on a.id = b.id where a.isin_closing_date=0
and a.market in ('XFFA', 'XFFA') and
b.isin_type= 'I' and b.isin = 'DEX' group by b.isin,
a.market, a.ccy, a.stock_mkt
what's needed is to get the earliest record all times, no mater the currency :
isin | market | ccy| stock_mkt | max(a.year) | max(a.month ) | max(a. day)
DEX | XFFA | EUR | 013 | 2014 | 11 | 25
Using Group By And Order By Clause
May 21, 2014I have a a grid (Fig-1) where i have LineID and corresponding RankValue. I want to sort out the Grid like (Fig-2) where It will be sorted based on Rank Value(Higher to lower) but LineID group should maintain. I am using SqlServer 2008.
View 3 Replies View RelatedHelp Needed In Group By With Order By
Apr 15, 2008hi,
my table data:
Sensor_Serial_No date_time Attribute_Flag
-----------------------------------------------------
2 2008-03-03 01:00:00 5
2 2008-03-03 06:00:00 5
my result should be like this
Sensor_Serial_No no of times occured Attribute_Flag lastoccurence
2 2 5
2008-03-03 06:00:00
please give me query for this please
Group By And Order By Problem
Sep 22, 2007I have the following statement that is working just fine:
SQL = "select* from products GROUP BY name ORDER BY price"
I have many products with the same name but with different prices and I want to display unique records along with other information but I want to display the cheapest product first. It is displaying the first record in the table with that name but not the cheapest distinct record in the list of all distinct product names.
Not sure of the above makes sense so this is the kind of data in the table.
Name= Test1, Price= 25
Name= Test2, Price= 20
Name= Test1, Price= 15
Name= Test3, Price=30
When listing the products it will show the following order:
Test2, 20
Test1, 25
Test3, 30
However I want it to display:
Test1, 15
Test2, 25
Test3, 30
Thanks for any help.
Daniel
Using Group By And Order By With The Same Column
Apr 9, 2008Hi All,
Please let me know if both query fetch the same result
Select Col1, Col2, Col3, Col4 from Table1 Group By Col1, Col2, Col3, Col4
Order By Col1, Col2
Select Col1, Col2, Col3, Col4 from Table1
Order By Col1, Col2
Thanks,
Muthu
Tricky Group By Order By Query
Jul 23, 2005Hello, I'm trying to find the most optimal way to perform a trickyquery. I'm hoping this is some sort of standard problem that has beensolved before, but I'm not finding anything too useful so far. I havea solution that works (using subqueries), but is pretty slow.Assume I have two tables:[Item]ItemID int (Primary Key)ItemSourceID intItemUniversalKey uniqueidentifierPrice int[Source]ItemSourceIDPriorityI'm looking for a set of ItemIDs that match a query to the Price(something like Price < 30), with a unique ItemUniversalKey, taking thefirst item with each key according to Source.Priority.So, given Item rows like this:1 2 [key_one] 152 2 [key_two] 253 1 [key_one] 15and Source rows like this:1 12 2I want results like this:2 2 [key_two] 253 1 [key_one] 15Row 1 in Item would be eliminated because it shares an ItemUniversalKeywith row 3, and row 3's Source.Priority is lower than row 1.Help!?
View 5 Replies View RelatedExactly-Once-On-Order - Conversation Group Question
Sep 30, 2007
Hi,
A SSB newbie question:
Looking in a various resources, i see that a conversation group guarantees receiving messages EOID, which means that each message will be received only once, and that messages will be received in the order they were sent.
However, the documentation explicitly states that only dialogs guarantee messages order. So, I€™m a little bit confused, what's the "In-Order" stand for in "Exactly Once In Order"?
Thanks,
Ido
T-SQL (SS2K8) :: Group By And Order By - Location Starting With A And B
Jul 7, 2014I am having below schema.
CREATE TABLE #Turnover (
location varchar(50),
Total int
)
insert into #Turnover (location,Total) values('A', 500)
insert into #Turnover (location,Total) values('AB', 200)
insert into #Turnover (location,Total) values('ABC', 100)
insert into #Turnover (location,Total) values('BA', 100)
insert into #Turnover (location,Total) values('BAC', 500)
insert into #Turnover (location,Total) values('BAM', 100)
Now i want output order by total but same time i want to create two groups. i.e. location starting with A and order by total and after locations starting with B and order by total.
Analysis :: Measure Group Execution Order
Sep 21, 2015I am executing a CUBE which is having 9 measure groups, i need to know order of the execution of the measure groups.??
ex:
1. fsales
2.ftranssales
3.fitem
4.fstores..............etc...
I know, the dimension are executed first, but not aware of the order of execution of measure group.
SQL Server 2014 :: Order By Month Number In A Group By
Dec 19, 2014Sample Data
SET NOCOUNT ON;
USE tempdb;
GO
CREATE TABLE CheckRegistry (
CheckNumber smallint,
[code]...
How can I get the result orderd by the month number?
Full-text Search With Order By Or Group By Is Unusable
Feb 13, 2008Using SQL Server 2005 (9.0.3042), I can not get a full-text search query to work with order by or group by. For example, if I run the following query...
SELECT s.networkID, i.interID
FROM Interactions i
INNER JOIN CONTAINSTABLE(Interactions, text, 'ipo') t ON t.[key] = i.interID
INNER JOIN Sessions s ON i.sessionID = s.sessionID
WHERE i.startTime BETWEEN 1051772400000 AND 1054537199000
It returns two rows immediately.
If I add an "order by" or "group by" like...
SELECT s.networkID, i.interID
FROM Interactions i
INNER JOIN CONTAINSTABLE(Interactions, text, 'ipo') t ON t.[key] = i.interID
INNER JOIN Sessions s ON i.sessionID = s.sessionID
WHERE i.startTime BETWEEN 1051772400000 AND 1054537199000
ORDER BY s.networkID, i.interID
The CPU shoots to 100% and I have to kill the query. I have tried many variations of the above and I can not get the query to work with order by or group by. Is this a bug in SQL Server? Is there a fix or workaround?
T-SQL (SS2K8) :: Outer Join Add Non Matching Rows To Each Order Group?
Mar 30, 2015In Outer join, I would like to add the outer columns that don't exist in the right table for each order number. So currently the columns that don't exist in the right table only appear once for the entire set. How can I go about adding PCity, PState to each order group, so that PCity and PState would be added as null rows to each group of orders?
if OBJECT_ID('tempdb..#left_table') is not null
drop table #left_table;
if OBJECT_ID('tempdb..#right_table') is not null
drop table #right_table;
create table #left_table
[Code]....
Analysis :: Order Total For Orders Containing A Specific Product Group?
May 27, 2015I have a request for being able to show ordertotals for those orders that contains a specific productgroup.
Case
Order 1  ProductGroup  Value
A 20
B 40
C 40
Total 100
Order 2  ProductGroup  Value
A 20
DÂ 40
Total 60
So if i slice OrderTotal by ProductGroup the result will be
A 160
B 100
C 100
D 60
ALL Â Â Â Â Â Â 160
how to solve this.
Does Size Really Matter?
Mar 6, 2001Morning Folks,
I'm setting up SQL Server 7.0 as follows:
12 Gb initial data load;
heavy transaction OLTP;
4 processors;
RAID5
disk space NOT an issue.
I'm trying to figure out what a reasonable initial size for both the Transaction Log and
Tempdb should be. I was thinking 100Mb for each. Is this reasonable, or could either afford
to have more?
Is there a percentage of the .mdf that is recognized as a general rule of thumb for setting up
the Transaction Log and/or Tempdb?
Also, is there any value in assigning Filegroups in a RAID5 setup?
Thanks,
Sergio
Cannot Install No Matter What I Do!
May 26, 2007I've officially done everything. I've uninstalled everything I can think of. I've cleaned the registry until it sparkles. I've removed all directories having anything to do with VS or SQL. I've even run the uninstall tool multiple times and been told everything is OK. However, SQL Server Express STILL tells me there are "beta versions" of stuff on my machine. Do you have any suggestions, or should I just give up in disgust?!?!?!
View 3 Replies View RelatedDoes It Matter If The Criteria Is In The FROM Or The WHERE?
May 6, 2008I have a query that searches through a 4 million record table. The data is fed from the UNIX flat file systems so the data is not in optimal search format. So I created some views that massaged the data and then index them. I select and join the original table with the view, with NOEXPAND hint on the view. My question is this theory right: If I put the criteria in the FROM join part then it will make the join easier than if I put it in the where clause?
Example (any difference)
SELECT stuff1, stuff2 FROM UglyData u INNER JOIN MassageTable m ON m.RecNumber LIKE '112%' AND u.ID = m.ID
versus
SELECT stuff1, stuff2 FROM UglyData u INNER JOIN MassageTable m ON u.ID = m.ID WHERE m.RecNumber LIKE '112%'
THANKS!!!
Does SQL Server Version Matter
Aug 10, 2006Hi,
I have a question i need to ask. Since i'm new to SQL Server, i did a bit of experiment with SQL Server 2005 Express. I made up a simple Access Database file and migrated it to SQL Server. it was success which is good. Now i have a real Access Database file which i built for my client. Since he uses the SQL Server 2000 service pack 4, i was wondering if the version would matter a lot.
Thank you in advance
What Matter Are There If I Always Set Big Length In Nvarchar Field?
Sep 29, 2006There are two fieldsA1 nvarchar(30)A2 nvarchar(800)I know nvarchar field is alterable length, if I store a string mystring='abc' to A1 field or to A2 field, I think they use the same disk space, so I think it's always a good way to define a big length nvarchar field such as A3 nvarchar(4000) for any length string, becuase they always use the same disk space, is it right?
View 1 Replies View RelatedTABLE JOIN! DOES DATE FORMAT MATTER?
May 23, 2001I have two tables that I am trying to join and both have similar columns with which I am trying to use. One is Date and the other is LOGdate. Date's format is "01/01/2000" BUT LOGdate's is "01/01/2000 12:41:00 PM/AM". Can I join these two tables?
Any help would be greatly appreciated.
Thank you
TABLE JOIN! DOES DATE FORMAT MATTER?
May 23, 2001I have two tables that I am trying to join and both have similar columns with which I am trying to use. One is Date and the other is LOGdate. Date's format is "01/01/2000" BUT LOGdate's is "01/01/2000 12:41:00 PM/AM". Can I join these two tables? If yes how do I get rid of the excess time on LOGdate.
Any help would be greatly appreciated.
Thank you
Table Design Question - Subject Matter Expert Database
Aug 8, 2007I would like to create a database that keeps track of our companies subject matter experts. I have roughed out some of the tables. I would appreciate any feedback on if this is the right approach and if there might be any issues when I start writting a front-end (probably VB 2005).
What makes this interesting (at least for me) is that a subject has an owner and at least 1 "expert", possibly up to 3. Here is what I am thinking for tables:
tblEmployee
EmployeeID (PK)
LastName
FirstName
etc......
tblSubject
SubjectID (PK)
Description
tblOwner
SubjectID (FK)
EmployeeID (FK)
tblExpert1
SubjectID (FK)
EmployeeID (FK)
tblExpert2
SubjectID (FK)
EmployeeID (FK)
tblExpert3
SubjectID (FK)
EmployeeID (FK)
Does this make sense? Would I run into any issues when trying to display this on a form in VB?
Thanks in advance for any help!!!!!
Cal
Reporting Services :: Display Group Name Value Of Each Group In Column Header Outside The Group?
Sep 29, 2015I have an SSRS 2012 table report with groups; each group is broken ie. one group for one page, and there are multiple groups in multiple pages.
'GroupName' column has multiple values - X,Y,Z,......
I need to group 'GroupName' with X,Y,Z,..... ie value X in page 1,value Y in page 2, value Z in page 3...
Now, I need to display another column (ABC) in this table report (outside the group column 'GroupName'); this outside column itself is another column header (not a group header) in the table (report) and it derives its name partly from the 'GroupName' Â values:
Example:
Value X for GroupName in page 1 will mean, in page 1, column Name of ABC column must be ABC-X Value Y for GroupName in page 2 will mean, in page 2, column Name of ABC column must be ABC-Y Value Z for GroupName in page 3 will mean, in page 3, column Name of
ABC column must be ABC-Z
ie the column name of ABC (Clm ABC) Â must be dynamic as per the GroupName values (X,Y,Z....)
Page1:
GroupName          Clm ABC-X
X
Page2:
GroupName          Clm ABC-Y
Y
Page3:
GroupName          Clm ABC-Z
Z
I have been able to use First(ReportItems!GroupName.Value) in the Page Header to get GroupNames displayed in each page; I get X in page 1, Y in page 2, Z in page 3.....
However, when I use ReportItems (that refers to a group name) in the Report Body outside the group,
I get the following error:
Report item expressions can only refer to other report items within the same grouping scope or a containing grouping scope
I need to get the X, Y, Z ... in each page for the column ABC.
I have been able to use this - First(Fields!GroupName.Value); however, I get ABC-X, ABC-X, ABC-X in each of the pages for the ABC column, instead of ABC-X in page 1, ABC-Y in page 2, ABC-Z in page 3, ...
Group By WEEKDAY And ORDER By WEEKDAY
Jan 31, 2014I try to make the following:
select DATENAME(WEEKDAY,[date]) as DAY, sum(earnings) as Earnings
from myTable
where DATENAME(WEEKDAY,[date]
in ('monday','tuesday','wednesday','thursday','friday')
group by DATENAME(WEEKDAY,[date])
order by DAY
this query works very well except the last line. the last line causes SQL-Server to order the days in an alphabetical order.What do I have to do that SQL-Server orders the days according to their natural appearance (monday, tuesday, wednesday, thurs......)
Join Small Table To Big Table Or Vice Versa, Does It Matter?
Jul 23, 2005If I join Table1 to Table2 with a WHERE condition, isit the same if I would join Table2 to Table1 consideringthat the size of the tables are different.Let's assume Table2 is much bigger than Table1.I've never used MERGE, HASH JOINs etc, do any ofthese help in this scenario?Thank you
View 3 Replies View RelatedHow Dose It Matter For The Non-clustered Index Key Columns And Included Columns?
Apr 24, 2007Hi, all experts here,
Thanks a lot for your kind attention.
As I am creating the non-clustered indexes for the tables, I dont quite understand how dose it really matter to put the columns in the index key columns or put them into the included columns of the index?
I am really confused about that and I am looking forward to hearing from you and thank you very much again for your advices and help.
With best regards,
Yours sincerely,
How To Know What BRKR TASK (or Any Background Task For That Matter) Is Doing?
Apr 3, 2008Sometimes we have some pretty serious CPU spikes and I would like to be able to pinpoint the exact issue. I have been able through the DMVs to associate a session with an operating system thread. That's great if I have a batch that's causing the problem with a non NULL sql_handle. However, how do I further narrow down what is going on with the background service broker tasks using the DMVs? Or am I just at the blind mercy of SQL Server at this point? What can I query to know what the heck is going on?
View 10 Replies View RelatedExpress Will Not Load. Insurmountable Difficulties With Order Of Uninstalls/order Of Installs/ Suggestions Plz
Jan 7, 2007Finding the "pieces of information" I need to successfully install the SQL Server Express edition is so complex. Uninstalls do "not" really uninstall completely, leading to failure of SQL install. Can you suggest a thorough, one-stop site for directions for the order of app uninstalls and then the order for app installs for the following...
SQL Server Express edition
Visual Studios 2005
Jet 4.0 newest upgrade
.Net Framework 2.0 (or should I use 3.0)
VS2005 Security upgrade
Anything else I need for just creating a database for my VS2005 Visual Basic project?
I was trying to use MS Access as my backend db but would like to try SQL Express
Thank you, Mark
Conditional Order By - Sort Result Set By Employee Number Ascending Order
Sep 24, 2012In SQL sERVER 2008, I have two fields - Depatment and Employees. I need to sort the result set by employee number ascending order, with following exception
1)when department number = 50 - the preferred order is Employee # - 573 followed by 551-572 (employee # belong to Dept 50 = 551-573)
2)When Department number = 20 – the preferred sort order is Employee # 213-220, followed by Employee # 201-213 (employee # belong to Dept 20 = 201-220)
How shall I achieve this?
Analysis :: Order Of Rows In Tabular Table Not In Same Order Data Was Retrieved?
May 19, 2015I never paid much attention to this before but I noticed this today in a new table I was creating.
For tables defined in the tabular model the table properties have something like SELECT Blah FROM TableName ORDER BY Blah Then in the tabular model the table's data is in the same order it was ordered by in the data source for the table.
I have a date table I setup and I noticed it is NOT respecting the sort order.
I have it sorted by DateID which sorts with the oldest date first and newest date as last row.However, the table that is imported and stored in the data model is not in that order.
I can of course manually sort the rows in BIDS/DataTools, but I find this discrepancy odd.
Would this have negative impacts on the EARLIER function for example if the data rows are not in the order specified?
Calculate Total Amount Of Order Details Based On Particular Order
Apr 10, 2014I have a query that calculate the total amount of order details based on a particular order:
Select a.OrderID,SUM(UnitPrice*Quantity-Discount)
From [Order Details]
Inner Join Orders a
On a.OrderID=[Order Details].OrderID
Group by a.OrderID
My question is what if I wanted to create a formula to something like:
UnitPrice * Quantity - DiscountAmount Where DiscountAmount = UnitPrice Quantity * Discount
Do I need to create a function for that? Also is it possible to have m y query as a table variable?