Good SQL Query

Mar 7, 2005

Folks, i've got a table with a column; ACCOUNT VARCHAR(30). All the values numeric though. (leave abt the datatype yet).
The column is clustered indexed.

SELECT * FROM MYTABLE WHERE LEFT(ACCOUNT,3)='123'
execution plan shows CLUSTERED INDEX SCAN.

SELECT * FROM MYTABLE WHERE ACCOUNT LIKE '123%'
execution plan shows CLUSTERED INDEX SEEK.

How, why. Why doesn't the optimizer works good for the first query?


Howdy!

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Possibly Simple Query But I'm Not Good Enough To Fathom It!

Mar 8, 2006

Hi AllI know that I should supply the DDL for the tables I'm going to talk about,but I'm not 100% on how to generate them just yet. Hopefully my question ismore a query methodology question than how the tables are constructed.My first attempt at the query is as follows:SELECT st.STOCKID, sd.FULLDESCRIPTION, sc.NAME, Sum(sq.QUANTITYINSTOCK) AS'Qty In Stock Total', Sum(st.QUANTITY) AS 'Qty Sold'FROM STOCK s, STOCKCATEGORIES sc, STOCKDESCRIPTIONS sd, STOCKQUANTITIES sq,STOCKTRANSACTIONS stWHERE sc.STOCKCATEGORYID = s.STOCKCATEGORYID AND st.STOCKID = s.STOCKID ANDsd.STOCKID = s.STOCKIDAND sq.STOCKID = s.STOCKID AND (sd.LANGUAGEID='UK') AND(st.TRANSACTIONTYPE=8) AND(sq.QUANTITYINSTOCK > 0)GROUP BY st.STOCKID, sd.FULLDESCRIPTION, sc.NAMEThis works in a fashion, but I need to sort of query the stocktransactionstable again to get the sum of the st.QUANTITY table for st.TRANSACTIONTYPE=1so that I can have an extra select field of Sum(st.QUANTITY) AS 'QtyOrdered', ie transactions with transactiontype of 1 are sales orders andtype 8 are invoices.I basically need to get a report result of:PRODUCT, DESCRIPTION, CATEGORY, CURRENT_STOCK_QTY, SALES_IN_PERIOD,ORDERS_IN_PERIODIs there any pointers whatsoever you can give me to try and get thisdouble-double query to work?Many thanks.Rgds Laphan

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Aug 6, 2007

I graduated from college about three years ago and have been working as a programmer using MS SQL 2000 and even though I've learned a TON in these past three years I know there is tons more I can learn.

Because my company uses Microsoft SQL Server 2000 I'd like to focus on that, but anything ANSI-SQL is perfectly fine.

So... what are some good books on SQL query optimization and other advanced SQL topics?

Thanks in advance...

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Feb 4, 2008

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2. The string is executed via EXEC @SQL.

It seems to me that the whole process can eliminate the EXEC and just use some other construct. All the parameters are passed in via the initial call to the stored proc. It also seems that every time this is executed it will result in a new query compile and cache useage, no matter what. Wasteful? Should I take the developers aside and knock heads? I think the app was coded by some folks who were rookies then but may be willing to crack open their code. Or, am I the one that is a rookie?

Thanks for your inputs.

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hello
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NubNub

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Jan 7, 2008

 hello all..i have make a searching, but is not good. my code like that:Public Class getall Public Function getitem(ByVal id As String) As DataSet        Dim con As SqlConnection = New SqlConnection("Data Source=BOYsqlexpress;Initial Catalog=GAMES;User ID=ha;Password=a")        Dim ds As New DataSet()          Dim adapter As New SqlDataAdapter("select * from [item] where name like '%" & id & "%'", con)        Try            con.Open()            adapter.Fill(ds, "user")            Return ds        Catch ex As Exception            Console.Write(ex.Message)        Finally            con.Close()            con = Nothing        End Try        ' Next        Return ds    End Functionand class  my item in database is containning  dragon ball 3, counter strikeif i insert dragon, it can display dragon ball 3.but if i insert dragon 3, it not display dragon ball 3.it should display dragon ball 3 .how should i change my code?thx... 

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Dec 12, 2003

Hi, gurus!
Of course, you know that this:

... WHERE (COLUMNNAME = @PARAMETER)

works perfectly, but the opposite - when I need to pass
a column name as a parameter - the SQL Server 2000 cursing me...

I was designing some stored procedures and here is what I need:

... WHERE (@COLUMNNAME = 1)

^^^ I need to use a different column names here, so I decided to use
a parameter, but it does not even budge. Of course, I can use workaround:

IF @COLUMNNAME = 'External' THEN
BEGIN
SELECT ... WHERE (External = 1)
END

But, I SO! do not want to do it 9 times - I have 9 column names
to check...

Maybe, there is another way to do it?..

Thanks,
Cheers!

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Feb 15, 2004

I'm having some trouble working out how to query some data. Rather than explain up front, here's some examples of what I want to achieve:

*******************************************************

I've got a structure which looks vaguely like this:

[ANCESTORS]

Grandparent
Parent
Child

If limit by grandparents, then I only get the lineage for that particular grandparent. I.e.:


SELECT *
FROM [ANCESTORS]
( some sort of joins here )
Where Grandparent.Name = 'Cybill'



This would return all of the children of 'Cybill' and their children. Now, if I use the following query:


SELECT *
FROM [ANCESTORS]
( some sort of joins here )
Where Child.Name = 'Jean'



This would return Jean's parents + the parents of Jean's parents (Jean's grandparents).

Likewise, if I enter:


SELECT *
FROM [ANCESTORS]
( some sort of joins here )
Where Parent.Name = 'Ron'



Then I would get Ron's parents and also his children.


*******************************************************

So, as you can see, at first it appears that I'm after a LEFT JOIN - meaning that the grandparents don't need to have child records to be returned, but, then it turns out that I need INNER JOINS - to limit grandparents when I choose children.

Can anybody see my dilemma here?

Mark-up ASP.net posts here
MarkItUp.com

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I've tried a few products but nothing quite hits the mark. Is there a program you use and recommend I trial?


Cheers - Andy

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Hi, ive got some work to do on SQL queries, the scenario is below and at the bottom is my attempt at answering in the questions:
Could somebody simply tell me if the answer at the bottow are correct, if not what I have done wrong.

A local company that produces machine parts has decided to develop an in-house database system. They have identified the following tables: -

tblOrders OrderNo, CustomerNo, Date, OrderTotal

tblCustomers CustomerNo, Name, Street, Town, County, Postcode

tblParts PartNo, Description, UnitCost

tblItems OrderNo, PartNo, Quantity, ItemTotal



Create SQL queries to produce the following: -

a) Details of all orders over £1000 sorted by customer
number.

b) A list of all part descriptions and their quantities appearing on order 39

c) Delete all orders placed by customers in
Wrexham.

d) Archive all orders placed by customer Clarke into a new table called
tblArchive.

e) Increase the price of all parts whose description includes the
word “washer” by 4%.

These are my answer, which im not too sure if they are correct. If any1 could tell me if there correct or not that would be great, thanks.

a)
SELECT *
FROM tblOrders
ORDERBY CustomerNO
WHERE OrderTotal > 1000

b)
SELECT tblParts.PartNo, tblParts.Description, tblItems.Quantity
FROM tblItems INNER JOIN tblParts ON tblItems.PartNo = tblParts.PartNo;
WHERE OrderNo = 39

c)
DELETE tblOrders.*
FROM tblOrders INNER JOIN tblCustomers ON tblOrders.CustomerID = tblCustomers.CustomerID
WHERE Town = “Wrexham”

d)
INSERT INTO tblArchive
SELECT *
FROM tblOrders INNER JOIN tblCustomers ON tblOrders.CustomerID = tblCustomers.CustomerID
WHERE Name = “Clarke”

e)
UPDATE tblParts
SET UnitCost = [UnitCost]*1.04
WHERE Description LIKE “*washer” or Description LIKE “washer*” or
Description LIKE “*washer*”


Please help :)

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Hi,

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I already know C and the DB-Libe contains a lot of it but I'm kinda trying to expand some horizons. I'm ok with either C++/VC++ or JAVA but I only have time to learn (or be good at) one.

Any suggestions? (I'd like to hear what you think even if you say neither C++ or JAVA - maybe VB? What's easy and marketable is what matters most.)

Thanks.

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Jul 20, 2005

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by the way there are more than 10 users want to access the front end for dataentry.
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Sep 15, 2005

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