This works, but it's highly unefficient and generates a lot of IO. Is there another way to do it without the use of temp tables?
Code Block
select eh.*
from Equipment_History eh
where Equipment_History_ID in
(select top 2 Equipment_History_ID
from Equipment_History eh1
where Equipment_ID in
(select Equipment_ID
from Equipment_History eh2
where Equipment_History_ID in
(select min(Equipment_History_ID)
from Equipment_History eh3
where eh2.Equipment_ID = eh3.Equipment_ID
and eh2.Equipment_Status_Type in (1,2,3)))
and eh1.Equipment_ID = eh.Equipment_ID
order by Equipment_History_ID)
Equipment_History_ID is PK
Let me know what other information would be useful, I can barely understand my logic from looking at the code but it does in fact work.
SELECT Loan.loan_No AS Loan_No, Loan.customer_No AS Customer_No, Customer.first_name AS First_name, Customer.second_name AS Second_name, Customer.surname AS Surname, Customer.initials AS Initials, Bank.Bank_name AS Bank_name, Branch.Branch_name AS Branch_name, Branch.branch_code AS Branch_code , Bank_detail.bank_acc_type AS Bank_acc_type, Transaction_Record.transaction_Amount AS Transaction_Amount, Transaction_Record.transaction_Date AS Transaction_Date, Loan.product AS Product, Product.product_Type AS Product_Type, Product_Type.loan_Type AS Loan_Type
FROM Transaction_Record INNER JOIN Loan ON Transaction_Record.loan_No = Loan.loan_No INNER JOIN Product ON Loan.product = Product.product INNER JOIN Customer ON Loan.customer_No = Customer.customer_no INNER JOIN Bank_detail ON Customer.customer_no = Bank_detail.customer_no INNER JOIN Branch ON Bank_detail.Branch = Branch.Branch INNER JOIN Bank ON Branch.Bank = Bank.Bank INNER JOIN Product_Type ON Product.product_Type = Product_Type.product_Type
Here's the code I'd like to update, and below it a set of sample data:
Declare @StartDate DateTime Declare @EndDate DateTime Set @StartDate = '20-mar-2008' Set @EndDate = '25-mar-2008'
SELECT
COUNT (iqs.childid) as Cnt ,CASE
--Search Categories and Create Initial Groupings-- WHEN Category LIKE '%Jewel%' THEN 'Accessories' WHEN Category LIKE '%Beauty%' THEN 'Accessories' WHEN Category LIKE '%Accs%' THEN 'Accessories' WHEN Category LIKE '%Gift%' THEN 'Accessories' WHEN Category LIKE '%Grooming%' THEN 'Accessories' WHEN Category LIKE '%Female%Prem%Brands%' THEN 'WomensPremiumOutsideBrand' WHEN Category LIKE '%Female%Prem%OB%' THEN 'WomensPremiumOwnBrand' WHEN Category LIKE '%Female%Brand%' THEN 'WomensOutsideBrand' WHEN Category LIKE '%Female%OB%%' THEN 'WomensOwnBrand' WHEN Category LIKE '%Female%' THEN 'Womenswear' WHEN Category LIKE '%Male%Prem%Brands%' THEN 'MensPremiumOutsideBrand' WHEN Category LIKE '%Male%Prem%OB%' THEN 'MensPremiumOwnBrand' WHEN Category LIKE '%Male%Brand%' THEN 'MensOutsideBrand' WHEN Category LIKE '%Male%OB%' THEN 'MensOwnBrand' WHEN Category LIKE '%Male%' THEN 'MensOwnBrand' END AS CategoryGroup ,CONVERT(VARCHAR(10), iqs.StatusDate, 103) AS StatusDate
FROM InventoryQueryStatus iqs JOIN InventoryStatus [is] ON [is].StatusID = iqs.StatusID JOIN Inventory i ON i.InventoryID = iqs.InventoryID JOIN InventoryCategory ic ON ic.CategoryID = i.CategoryID WHERE iqs.StatusID = 31000 and Category NOT LIKE 'Force%' --AND iqs.StatusDate >=GETDATE()-1 AND iqs.StatusDate BETWEEN @StartDate AND @EndDate GROUP BY CASE
--Search Categories and Create Initial Groupings-- WHEN Category LIKE '%Jewel%' THEN 'Accessories' WHEN Category LIKE '%Beauty%' THEN 'Accessories' WHEN Category LIKE '%Accs%' THEN 'Accessories' WHEN Category LIKE '%Gift%' THEN 'Accessories' WHEN Category LIKE '%Grooming%' THEN 'Accessories' WHEN Category LIKE '%Female%Prem%Brands%' THEN 'WomensPremiumOutsideBrand' WHEN Category LIKE '%Female%Prem%OB%' THEN 'WomensPremiumOwnBrand' WHEN Category LIKE '%Female%Brand%' THEN 'WomensOutsideBrand' WHEN Category LIKE '%Female%OB%%' THEN 'WomensOwnBrand' WHEN Category LIKE '%Female%' THEN 'Womenswear' WHEN Category LIKE '%Male%Prem%Brands%' THEN 'MensPremiumOutsideBrand' WHEN Category LIKE '%Male%Prem%OB%' THEN 'MensPremiumOwnBrand' WHEN Category LIKE '%Male%Brand%' THEN 'MensOutsideBrand' WHEN Category LIKE '%Male%OB%' THEN 'MensOwnBrand' WHEN Category LIKE '%Male%' THEN 'MensOwnBrand' END ,CONVERT(VARCHAR(10), iqs.StatusDate, 103)
I have a WHERE clause that could be an "=" or a "LIKE" depending uponif the passed variable is populated or not. I would like to know thebest way to write the WHERE clause to make it dynamically switchbetween the 2 and make best use of the indexes.CREATE TABLE myTable(ID INT PRIMARY KEY CLUSTERED, COUNTY VARCHAR(50))CREATE INDEX IDX_myTable_County ON myTable(COUNTY)DECLARE @COUNTY VARCHAR(50)SET @COUNTY = 'SANTA CLARA' -- Could also be SET @COUNTY = NULLSELECT ID FROM myTableWHERE COUNTY LIKE (CASE WHEN @COUNTY IS NOT NULL THEN @COUNTY ELSE '%'END)This does not seem like best practice to me because I am forced to use"LIKE" even when @COUNTY is populated with data. Ultimately I'd like:WHERE (CASE WHEN @COUNTY IS NOT NULL COUNTY = @COUNTY ELSE COUNTY LIKE'%' END)but that is incorrect syntax on "=".Also, I do not want to use a dynamically built statement. Is there away around this?Thanks,Josh
SELECT CASE WHEN Population BETWEEN 0 AND 100 THEN '0-100' WHEN Population BETWEEN 101 AND 1000 THEN '101-1000' ELSE 'Greater than 1000' END AS Population_Range, COUNT(CASE WHEN Population BETWEEN 0 AND 100 THEN '0-100' WHEN Population BETWEEN 101 AND 1000 THEN '101-1000' ELSE 'Greater than 1000' END) AS [No. Of Countries] FROM Country GROUP BY CASE WHEN Population BETWEEN 0 AND 100 THEN '0-100' WHEN Population BETWEEN 101 AND 1000 THEN '101-1000' ELSE 'Greater than 1000' END
We are load testing SQL 2005 and I need to re-write the index scripts that we have from 2000. Is there an easier way to rewrite the scripts without having to go to each job, then each step and modify it?
Our current index script template is:
Create NonClustered Index [IdxABCDE] On dbo.blahblah(blahID) With FillFactor = 90, Statistics_NoRecompute On [Index2] Go
and I need to rewrite it as:
ALTER INDEX [IdxABCDE] ON [dbo].[blahblah] REBUILD WITH (FILLFACTOR = 90, ONLINE = OFF,SORT_IN_TEMPDB=ON, STATISTICS_NORECOMPUTE = ON, MAXDOP=4)
I am thinking I would have to rewrite the scripts from scratch. We have hundreds of index scripts. So before I brace myself to lot of typing, just wanted to find out if there is any easier way..
Thanks..
Dinakar Nethi ************************ Life is short. Enjoy it. ************************ http://weblogs.sqlteam.com/dinakar/
I have a complex stored procedure that utilises inner joins, and in the WHERE clause there is defined a subquery. This subquery has now cause a performance hit to the ponit where the server is returning a timeout. Need to find an alternate fast solution.....
SELECT BE.BlogEntryID
FROM vw_BlogEntry BE
INNER JOIN @BlogView BC ON BC.CommonID = BE.BlogCommonID
INNER JOIN vw_Blog B ON B.BlogID = BC.BlogID
WHERE (
... ) AND (
.... )
AND
(
-- GET ENTRIES WHERE COMMENT COUNT IS AT LEAST @CommentCount (..or @CommentCount = 0)
@CommentCount <= 0
OR BE.CommonID IN (SELECT bc.EntryCommonID FROM vw_BlogComment_Current bc
INNER JOIN tblVersionDetails vd ON bc.VersionID = vd.VersionID
WHERE
IsNull(@CommentStatus,'') = ''
OR vd.Status IN (SELECT * FROM fn_CsvToString(@CommentStatus))
I have to modify a stored procedure that is written by someone else.Basically the stored prcoedure uses a cursor to fetch the data from the table and then insert that data in another table. While fetching the code form another table, it also gets some distinct columns from another table Below is my code:
Declare data_cursor cursor for Select emp_no, emp_name, event_date, Test_no, Code, Test_result From test_table1 order by emp_no
[code]...
The reason, I have to modify the above stored proc because now because of application changes, I am getting around 50 distinct userID from test_table1 so the above subquery(SELECT @ProcessName = (select distinct userID from test_table1) won't work. How can I loop through the above stored proc so that each @ProcessName can get inserted in table TESTTable2 so in other words
I want to pass each userId one at a time and insert it in table test_table1 and other subsequent tables. I can declare another cursor to accomplish this, but I was wondering if there is any better way to rewrite this stored proc and not use the cursor at all.because of my application changes all these three statements above are throwing the error:
I have a query with 11 left joins. Some hits against tables with small amounts of reference data, whereas others are not so small. Should I rewrite this in another way, as performance is a requirement on this one? Or, should I do it another way?
I have a query which spends a lot of time calculating my CASE WHEN -statements.
My query looks like this
SELECT TOP 250
UserId, CASE WHEN
(someCol*0.4+someOtherCol*0.3) > 99 THEN 99 ELSE
(someCol*0.4+someOtherCol*0.3) END FROM
(
SELECT
UserId,
CASE WHEN @myparam > 50 THEN
CASE WHEN Col5+@myincrease > 99 THEN 99 ELSE Col5+@myincrease END ELSE
CASE WHEN Col6+@myincrease > 99 THEN 99 ELSE Col6+@myincrease ENDEND as someCol, CASE WHEN Col8+@myincrease3 > 99 THEN 99 ELSE Col8+@myincrease3 END as SomeOtherCol FROM
SomeTable ) t1
This is just a little bit of the full query. I cannot write the whole query since it contains alot of different views and calculations, but I have traced it down to that all these case when-statements is taking a lot of time to do. So I hope that this example will be enough for you to understand my problem.
I know about some tricks that can replace a CASE WHEN, for example using COALESCE or BETWEEN but that does not seem to work in my case.
Use the view master.sys.sql_logins (new in 2005) to get at the varbinary passwords like you did in your Sql Server 2000 scripts (instead of using passwords from master.dbo.sysxlogins).
I have altered the sp_help_revlogin (from Microsoft article # 246133 )
PLEASE TEST/FIX before you use this:
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sp_help_revlogin_2005]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[sp_help_revlogin_2005]
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO
CREATE PROCEDURE sp_help_revlogin_2005 @login_name sysname = NULL AS
DECLARE @name sysname
DECLARE @logintype char(1)
DECLARE @logindisabled int
DECLARE @binpwd varbinary (256)
DECLARE @txtpwd sysname
DECLARE @tmpstr varchar (256)
DECLARE @SID_varbinary varbinary(85)
DECLARE @SID_string varchar(256)
IF (@login_name IS NULL)
DECLARE login_curs CURSOR FOR
SELECT sid, name, type, is_disabled FROM master.sys.server_principals
WHERE name <> 'sa' and type in ('S','U','G')
ELSE
DECLARE login_curs CURSOR FOR
SELECT sid, name, type, is_disabled FROM master.sys.server_principals
WHERE name = @login_name
OPEN login_curs
FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @logintype, @logindisabled
I have a activeX script like below in DTS and I am trying to rewrite it in SSIS. What is the best way to do this? Can I do this using a look up table? or other transformers in SSIS '********************************************************************** ' Visual Basic Transformation Script '************************************************************************
' Copy each source column to the destination column Function Main() if DTSSource("RACE_AMERICAN_INDIAN_YN") = "1" then DTSDestination("RACE_NATIVE_AM_IND") = "Y" else if DTSSource("RACE_AMERICAN_INDIAN_YN") = "2" then DTSDestination("RACE_NATIVE_AM_IND") = "N" end if end if
if DTSSource("RACE_ASIAN_YN") = "1" then DTSDestination("RACE_ASIAN_IND") = "Y" else if DTSSource("RACE_ASIAN_YN") = "2" then DTSDestination("RACE_ASIAN_IND") = "N" end if end if
if DTSSource("RACE_AFRICAN_AMERICAN_YN") = "1" then DTSDestination("RACE_BLACK_IND") = "Y" else if DTSSource("RACE_AFRICAN_AMERICAN_YN") = "2" then DTSDestination("RACE_BLACK_IND") = "N" end if end if
if DTSSource("RACE_NATIVE_HAWAIIAN_YN") = "1" then DTSDestination("RACE_HAWAIIAN_IND") = "Y" else if DTSSource("RACE_NATIVE_HAWAIIAN_YN") = "2" then DTSDestination("RACE_HAWAIIAN_IND") = "N" end if end if
if DTSSource("RACE_CAUCASIAN_YN") = "1" then DTSDestination("RACE_WHITE_IND") = "Y" else if DTSSource("RACE_CAUCASIAN_YN") = "2" then DTSDestination("RACE_WHITE_IND") = "N" end if end if
if CInt (DTSSource("RACE_AMERICAN_INDIAN_YN")) + CInt (DTSSource("RACE_ASIAN_YN")) + CInt (DTSSource("RACE_AFRICAN_AMERICAN_YN")) + CInt (DTSSource("RACE_NATIVE_HAWAIIAN_YN")) + CInt (DTSSource("RACE_CAUCASIAN_YN")) = 9 then if DTSSource("RACE_AMERICAN_INDIAN_YN") = "1" then DTSDestination ("RACE_CD") = 40 DTSDestination ("RACE_MULT_IND") = "N" DTSDestination ("RACE_OTH_IND") = "N" else if DTSSource ("RACE_ASIAN_YN") = "1" then DTSDestination ("RACE_CD") = 16 DTSDestination ("RACE_MULT_IND") = "N" DTSDestination ("RACE_OTH_IND") = "N" else if DTSSource ("RACE_AFRICAN_AMERICAN_YN") = "1" then DTSDestination ("RACE_CD") = 32 DTSDestination ("RACE_MULT_IND") = "N" DTSDestination ("RACE_OTH_IND") = "N" else if DTSSource("RACE_NATIVE_HAWAIIAN_YN") = "1" then DTSDestination ("RACE_CD") = 51 DTSDestination ("RACE_MULT_IND") = "N" DTSDestination ("RACE_OTH_IND") = "N" else if DTSSource("RACE_CAUCASIAN_YN") = "1" then DTSDestination("RACE_CD") = 31 DTSDestination("RACE_MULT_IND") = "N" DTSDestination("RACE_OTH_IND") = "N" end if end if end if end if end if else if CInt (DTSSource("RACE_AMERICAN_INDIAN_YN")) + CInt (DTSSource("RACE_ASIAN_YN")) + CInt (DTSSource("RACE_AFRICAN_AMERICAN_YN")) + CInt (DTSSource("RACE_NATIVE_HAWAIIAN_YN")) + CInt (DTSSource("RACE_CAUCASIAN_YN")) = 10 then DTSDestination("RACE_CD") = 99 DTSDestination("RACE_MULT_IND") = "N" DTSDestination("RACE_OTH_IND") = "N" else if CInt (DTSSource("RACE_AMERICAN_INDIAN_YN")) + CInt (DTSSource("RACE_ASIAN_YN")) + CInt (DTSSource("RACE_AFRICAN_AMERICAN_YN")) + CInt (DTSSource("RACE_NATIVE_HAWAIIAN_YN")) + CInt (DTSSource("RACE_CAUCASIAN_YN")) < 9 then DTSDestination("RACE_CD") = 52 DTSDestination("RACE_MULT_IND") = "Y" DTSDestination("RACE_OTH_IND") = "N" end if end if end if
Suposse that some models are deployed in Report Server for a while, and users have developed some ad-hoc reports on them using Report Builder, (some of the models are SSAS Cubes).
Modifications are required for a Model, what is the procedure to deploy this modifications? What happens with ad-hoc reports of this Model? Rewrite all the reports is a VERY BAD option, I agree that some reports must be rewrote, but only if they reference objects no longer valids in new model.
I suposse that the procedure for SSAS Cube Models will be different for a Relational Database Source because metods of generating models are so different. (I am particularly curious about Cubes, I can't figure out how I can do it)
Table #1 SELECT EID, DATEPART(wk,[Date]) AS Week, MAX([Date]) AS WeekEnding FROM Employee_Hours WHERE ([Date] Between '1/1/04' AND '12/31/04') GROUP BY EID, DATEPART(wk,[Date]) HAVING MAX([Date]) = '1/24/04' --Pay period
Table #2 SELECT EID, DisplayName FROM Employee WHERE (Active=1)
I tried subqueries and temp tables but can't get the results I need. The first query will return the employees who entered their time for the given pay period.
I have the following sql statement: INSERT INTO prg_lvl VALUES ( 'Data Recovery', 'Data Recovery', 7, 'ENG', 0, 16, 'Menu=w_data_recovery_stk;', ( select max(menu_id) + 1 from prg_lvl ), 'K'); that works for Sybase and I wanna make it works for SQL Server.
The problem is the use ot the subquery (select max(menu_id) + 1 from prg_lvl).
Could I use subqueries in SQL Server in general or is there is any other method to overcome this problem
I am very new to SQL Server, working with it in class. I am trying to do procedures involving subqueries using the Northwind database, and am having a rough time.
For instance, I have the following code, which lists all orders for the month of November, 1996:
SELECT Customers.CustomerID, Customers.CompanyName, CAST(Orders.OrderDate AS CHAR (11) )AS OrderDate FROM Customers, Orders WHERE Customers.CustomerID = Orders.CustomerID AND OrderDate BETWEEN '11/1/1996' AND '11/30/1996' ;
I have been asked to do the same thing, but using a subquery. I came up with the following:
SELECT CustomerID, CompanyName FROM Customers a WHERE EXISTS (SELECT OrderDate FROM Orders b WHERE a.CustomerID = b.CustomerID AND OrderDate BETWEEN '11/1/1996' AND '11/30/1996' ) ;
However, it does not list the Order Date, as I want it to, and the information is not correct (it is missing a few orders from November '97 that should show up. Can someone tell me what I am doing incorrectly?
Please note that I do not need anyone to give me the code, but simply give me an idea of what I am doing incorrectly, or let me know how it can be done, so that I may do it. =-)
Hi all,I've seen mention that you can use nested subqueries down to as manylevels as you like but whenever I run the following:select * from table1where tab1ID in(select tab1ID from table2 where tab2ID in(select tab2ID from Table3 where Tab3ID=N))I get the error "incorrect syntax near the keyword 'where'"Can anyone confirm that sub-subqueries are possible? If so is thesyntax I'm using correct?I'm running SQL 2000 through a Delphi 5 app.RegardsJon
Guys,Got this query...---------------------------SELECT TOP 5 Tbl_admin_hotels.HotelName,(SELECT COUNT(Tbl_marketing_history.HotelID)FROM Tbl_marketing_historyWHERE Tbl_marketing_history.HotelID = Tbl_admin_hotels.HotelID)AS CountTotal,(SELECT MAX(DateSent)FROM Tbl_marketing_historyWHERE Tbl_marketing_history.HotelID = Tbl_admin_hotels.HotelID)AS LastSentFROM Tbl_admin_hotelsWHERE NOT Tbl_admin_hotels.HotelID = 99ORDER BY CountTotal DESC---------------------------Within the table Tbl_marketing_history there is also a 'Subject' column thatI require, the row to grab this Subject column from should relate to the rowI'm selecting in the SubQuery to grab 'DateSent'.I've tried and tried to grab multiple columns but failed miserably? Cananyone help pleaseeee!Cheers, Ash
In this stored procedure, I want to grab all the information for Sales Representatives that made less then 6 visits. I have done that in the subquery. But I also want to be able to display their visits by Dates where any number of visits was made. Meaning, i want to be able to show Everyday where a visit was made, but i only want the records that are less then 6 visits. So I want nulls to show up for the dates where no visits were made. So I can track the people that didnt make visits, on days other made visits (which means they should have visits too)
So basically my report looks like this: 09-10-2007 09-11-2007 09-14-2007 Tom Smith 1 3 4 Janice Cooper 3 5 5 Troy Slater 5 4 2 Kelly Short 4 4 4
When i want it to look like this:
09-10-2007 09-11-2007 09-12-2007 09-13-2007 09-14-2007 Tom Smith 1 3 null null 4 Janice Cooper 3 5 null null 5 Troy Slater 5 4 null null 2 Kelly Short 4 4 null null 4
Its an exception report, so i want to show what was not done , on days that are supposed to have things done, i cant show this, if dates are not displayed before there were no visits less then 6. I want to display all relevant dates, where any number of visits was mad. But only show the visits that were less then 6.
Here's my stored procedure that already has the less then 6 visits showing. But doesnt always show the dates. What should i do?
Hey everyone, I'm running into an issue where I have a select statement that retrieves all employee records from a employee table. In this statement I'm displaying first and last name, titlte and the employees manager id(which is the employees id). What I want is a query that instead of displaying the manager's id, display the manager's name. The query that I'm using below doesn't work. I was hoping that someone could help me out: SELECT LastName, FirstName, Title, Extension, (SELECT FirstName, LastName FROM Employees WHERE (ReportsTo = EmployeeID)) AS Reports FROM Employees
Here's the data that I'm using: LastName, First Name Title Extension Reprots To
Davolio Nancy Sales Representative 5467 13
Fuller Andrew Vice President, Sales 3457 0
Leverling Janet Sales Representative 3355 12
When I run this query I get a error saying "Only one expression can be specified in the select list when the subquery is not introduced with Exists"
So I already no this can't be done... but I need a suitable alternative (if one exists) so I don't have to competely re-write this already too huge query. Anyways, in my select I have something like this: sum( case when code in (1,2,3,4) then 0 else 1 end ) as total which has now increase from four static values to a more dynamic format, that being a table with 47 values which may shrink or grow over time. Attempting the following fails: sum( case when code in (select code_id from ExcludedCodes) then 0 else 1 end ) as total because apparently you can't use selects or aggregates within an aggregate. So any ideas on how I can get this working... is there no Array or List type variable I could just substitute in? I've already tried using a Table Variable, but that failed as well. Please keep in mind, this is one line of a very large select containing many other fields and aggregates (on a fair amount of joins) which is used in at least four differerent reporting queries. If there is no quick and easy replacement trick I can do just let me know so I can start re-writing all of them (which is seriously going to make my head hurt).
Hi, I have searched through this forum and haven't found the answer to a problem I am having so I figured I will post it.
My SQL statement:
Select * FROM tblData WHERE LastName= (SELECT tblData.LastName FROM tblData GROUP BY tblData.LastName HAVING (Count(tblData.LastName)>1))"
What I am trying to do: I am trying to make an SQL filter that I can apply to my form in order to only show records with duplicate last names. The sub query returns names that are already in the table. I then compare what is found to be duplicate with the original table in order to just show only the duplicate records. Everything works fine as long as there is only one name thats duplicated.
When there are multiple duplicate names then I run into an error.
When the statement is put into a string and executed in VBA I get this error:
"Run-time error '3021': No current record."
When the statement is put into a query and run against the DB I get this error:
"At most one record can be returned by this subquery"
So yeah, any help would be greatly appreciated. Am I going about this all wrong or am I just forgetting something? Thanks for any help.
I would like to know which of the following query is the fastest:
select * from customers C where exists (select 0 from ORDERS O where C.Name like 'A%' and O.Charged = 1)
select * from customers C where exists (select 0 from ORDERS O where O.Charged = 1) and C.Name like 'A%'
I don't want to use a JOIN clause. I just want to know if there is a difference of efficiency when the condition on C.Name is inside or outside the sub query.
I would like to know which of the following query is the fastest:
select * from customers C where exists (select 0 from ORDERS O where C.Name like 'A%' and O.Charged = 1 and O.Customers_Id = C.Id)
select * from customers C where exists (select 0 from ORDERS O where O.Charged = 1 and O.Customers_Id = C.Id) and C.Name like 'A%'
Because the condition C.Name like 'A%' is inside the sub query, I'm wondering if it will be evaluated for each record of the Orders table. Does anyone know if there is a difference of efficiency when this condition is inside or outside the sub query ?
I have tried this insert comand and it errors out telling me that icannot use subqueries this way. INSERT INTO tblPartLocation(PartLocation, Part)VALUES (999,(SELECT PartID FROM tblParts WHEREPartName = 'test'))how would i insert a value from a query?thanks for any help
I need to build a view that has 4+ columns that are "counts" of relationships with other tables.
for example:
Code Snippet select Name, Description, (select count(*) from PetOwner PO where PO.OwnerId = O.Id) as PetCount from O Owner
I need to add a few more counts to this query, but I'm thinking that is a bad idea since the number of joins is going to get out of control if I need more counts.
I've created a view with all the counts and it works fine.
I want to index the view so the counts aren't calculated everytime the query is run, but I can't index if I use a subquery like this.
In the end I want the result set to have these columns.
I have a table with two columns: OID and Cumulative (witch is the same type as OID) Each OID can have one or more Cumulatives.
Example of data: OID Cumulative 167 292 167 294 167 296 168 292 169 302 169 304
The cumulation of each OID don't stop at one cumulation, but can be endless (theoretical). Example: 167->292->590 So the table would have on more row: OID Cumulative 295 505
I would like to represent this strucuture in a tree view and I'm looking for a query that could give me a table with this structure: OID Cumul1 Cumul2 Cuml3 Cuml4 .... Cumuln in the way I can read the row and have as many child nodes as I have values in the columns. The number of columns depends on the row with most cumulations.
How can I do the query? Is there a better way as my table with n columns?
Dear experts, Recently i got an error msg looks like this: you cannot use subqueries within a sqldatadpter except the subquery is introduced with EXISTS. Well, actually i was using IN. I know I can revise my query sting to use INNER JOIN or such stuff just to remove the nested queries. But i'm realllllly curious why it's not allowed?? Really appreciate it if some expert can tell me. Thanks in advance
Hi what i like to do is insert in one table 2 value from 2 different row. exp: table1: person id name 1 bob 2 john so id like to make an insert that will result in this table 2: person_knowed idperson1: 1 idperson2: 2 so the wuery should look something like this:
insert into person_knowed(idperson1, idperson2)(select id from personwhere name = 'bob',select id from personwhere name = 'john')); anybody have an idea of how to acheive this?
Hello, How can I do something like: Insert Into Displayed(snpshot_id, user_id, user_domain, ddisplay, iWidth, iHeight, disp_size, disp_format, watermark, frc_update, creditcost) Values ((Select snpsht_id from SiteIndex Where user_domain like '%domain'), 1000, (Select domain_id from UserDomains Where user_domain like 'domain'), GetDate(), 480, 360, 2, 1, 1, 0, 3) Im getting an error: Subqueries are not allowed in this context. Only scalar expressions are allowed.
I wonder if somebody could give me advice on SQL Server7-specific handling of subqueries and backreferences...
What is a) more efficient, and b) faster:
1. IF (DATEDIFF(minute, ( SELECT tLastHitTime FROM ( SELECT * FROM tblSession WHERE tSessionID = 'abcd1234' ) as sess), getDate()) < 30) SELECT * FROM sess
or:
2. IF (DATEDIFF(minute, ( SELECT tLastHitTime FROM tblSession WHERE tSessionID = 'abcd1234' ) as sess), getDate()) < 30) SELECT * FROM tblSession WHERE tSessionID = 'abcd1234'
In the first example, 2 SELECT statements (line 2 & line 8) refer to derived table by its alias 'sess'. In the 2nd example, both queries are independant, yet identical...
I wonder if SQLServer is "smart" enough to execute identical queries only once, and then reuse the resulset (e.g. derived table), or it requires explicit references (such as alias) in order to do so...
