Performance Difference Of Numeric And String
Sep 15, 2014I have one question what is performance difference between cluster index on numeric field or string field? I know that numeric is faster but why it is faster?
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Removing Non-numeric Characters From Alpha-numeric String
Oct 24, 2007Hi,
I have one column in which i have Alpha-numeric data like
COLUMN X
-----------------------
+91 (876) 098 6789
1-567-987-7655
.
.
.
.
so on.
I want to remove Non-numeric characters from above (space,'(',')',+,........)
i want to write something generic (suppose some function to which i pass the column)
thanks in advance,
Mandip
Pattern Matching - Searching For Numeric Or Alpha Or Alpha-Numeric Characters In A String
Aug 18, 2006Hi,
I was trying to find numeric characters in a field of nvarchar. I looked this up in HELP.
Wildcard
Meaning
%
Any string of zero or more characters.
_
Any single character.
[ ]
Any single character within the specified range (for example, [a-f]) or set (for example, [abcdef]).
Any single character not within the specified range (for example, [^a - f]) or set (for example, [^abcdef]).
Nowhere in the examples below it in Help was it explicitly detailed that a user could do this.
In MS Access the # can be substituted for any numeric character such that I could do a WHERE clause:
WHERE
Gift_Date NOT LIKE "####*"
After looking at the above for the [ ] wildcard, it became clear that I could subsitute [0-9] for #:
WHERE
Gift_Date NOT LIKE '[0-9][0-9][0-9][0-9]%'
using single quotes and the % wildcard instead of Access' double quotes and * wildcard.
Just putting this out there for anybody else that is new to SQL, like me.
Regards,
Patrick Briggs,
Pasadena, CA
IP Or DNS : Difference In Performance ?
Sep 22, 2006Hello guys,
I would like to know if there is any meaningful difference in speed performance between using the DNS ("sql.server.com") or the IP address of the sql-server in the connection string.
The advantage of using DNS is that if there is any change in IP, I do not have to change the connection strings, but I do not want to loose speed because of the necessity to resolve the DNS.
Thanks for any help!
Regards,
Fabian
my favorit hoster is ASPnix : www.aspnix.com !
Is There Any Difference Performance Wise
Dec 4, 2007Dear All,
is there any difference performance wise using
select * from my_table
and
select mycol1,mycol2....mycoln from my_table
actually i've read from one article the there is big difference....
please clear my doubt...
thanks in advance
Vinod
Even you learn 1%, Learn it with 100% confidence.
What's The Performance Difference Between WITH And A Subquery?
Aug 24, 2006Hello Everyone,
Does anyone know if there is a performance difference between the new WITH clause t-sql and the subquery?
On a basic functionality level, they seem to perform the same function but I was wondering if there are any performance difference between the 2?
Thanks,
Joseph
Fetch Numeric Value From String?
Apr 1, 2015I want the Numeric Value from Combination of alphabets(a-z,A-Z) , Special Characters and Numeric Value.
example ::
I have '13$23%as25_*' and query should return --> 132325 as result.
Convert String To Numeric
Jul 29, 2007
Hi all,
I defined an user string type varible in the package as AccountLen. I am trying to use this varible in the Expression of Derived Column transformation.
I want to retrieve a part of column, i.e: Right(Column1, @AccountLen), this is always wrong because the AccountLen is string type. How I can convert it to the numeric so that can be used in the RIGHT function?
Thanks
String Operations On Numeric Value And ODBC
Apr 10, 2001This statement works fine in T-SQL, but when executed thru ODBC results in a <NULL>. How can I get this to work thru ODBC....? Im guessing I need to use CAST, but not sure how the sytax would be, my attempts have worked but still resulted in a <NULL>...
UPDATE mytable SET
switch = left(switch, 3) + '1' + right(switch , len(switch) -4)
WHERE blah = blah
(switch is a Numeric field)
Thanks,Adrian
Parse A Numeric String From A Field
Jul 23, 2005Hello All,I'm trying to parse for a numeric string from a column in a table. WhatI'm looking for is a numeric string of a fixed length of 8.The column is a comments field and can contain the numeric string inany positionHere's an example of the values in the column1) Fri KX 3-21-98 5:48 P.M. arrival Cxled ATRI #27068935 3-17-982) wed.kx10/26 Netrez 95860536Now I need to parse through these lines and return only the 8 digitnumbers in itThe result set should be2706893595860536This is what I've done so farDeclare @tmp table(Comments_Txt varchar(255))Insert into @tmpselect Comments_Txt from Reservationselect * FROM @tmp where Comments_Txtlike ('%[0-9][0-9][0-9][0-9][0-9][0**9]%')But it returns the entire comments field in the result set. What I needis a way to return just those 8 digits.Any Ideas??Thanks in advance!!!
View 2 Replies View RelatedSelecting Only Numeric Data From A String
Jan 12, 2006Hello,I need to be able to select only the numeric data from a string that isin the form of iFuturePriceID=N'4194582'I have the following code working to remove all the non-numeric textfrom before the numbers, but it is still leaving the single quote afterthe numbers, i.e. 4194582'Any ideas or suggestions how to accomplish that? Thanks in advance.Declare @TestData varchar(29)Set @TestData = "iFuturePriceID=N'4194582'"Select Substring(@TestData, patindex('%[0-9]%', @TestData),Len(@TestData))TGru*** Sent via Developersdex http://www.developersdex.com ***
View 3 Replies View RelatedCheck The First Occurence Of A Numeric In A String
Mar 17, 2008
Hi All,
I want to extract a numeric value from a string. Example, in a string like - Mgmt Pack: Processor Exception Threshold >80% Every 10 Minutes. - I want to extract that number 80. Since, later I'll want this number to plot a graph.
Since this is going to be an alert pulled from OnePoint (MOM Operational Database), the number will vary, and so I cannot look for the same number. So, can anyone help me how to get this working?
Thanks a lot in advance and let me know if the question is not clear.
Manoj Deshpande.
Performance Difference Between Query Executed Through ASP.NET And SSMS
Sep 18, 2007I have also posted this in microsoft.public.sqlserver.programming.
I have a query which, depending on where I run it from, will either take 10 milliseconds or 10 seconds.
The query works perfectly when run in SQL Server Management Studio... in my database of around 70,000 items it returns the results in around 10ms. It uses all my indexes and indexed views correctly.
However when I run the identical query from my ASP.NET application, it takes around 10 seconds... 1000 times longer.
Looking at it in Sql Server Profiler I can't see any difference in the query, except from ASP.NET it needs 62531 reads and from SSMS it needs only 318 reads. If I copy the slow running ASP.NET query from the profiler into SSMS, then it runs quick again. The results returned are the same.
I have provided more details of the query below, but I guess my real question is: What is the best way to debug this? I'm not an expert with SQL Server, so any pointers on where I should start looking to find the difference in how the query is being executed would be a great help.
The query is of the form:
WITH RowPost AS
(
SELECT
ROW_NUMBER() OVER(ORDER BY DateCreated DESC) AS Row,
ItemId,
Title,
....
FROM
Items_View WITH(NOEXPAND)
WHERE ItemX >= @minX AND ItemX <= @maxX AND ItemY >= @minY AND ItemY <= @maxY
)
SELECT
*,
(SELECT Count(*) FROM RowPost) AS [Count]
FROM RowPost
WHERE Row >= @minRow AND Row < @maxRow
Where Items_View is an indexed view, and WITH(NOEXPAND) is being used to force it to use the indexed view (this is optimal). The line beginning "SELECT Count(*)" is to get the total number of results (without having to run the inner query a second time).
This is running against SQL Server Developer Edition.
Stripping Non-Numeric Characters From A String Function
Jul 9, 2002Hi,
As part of a data search project I need to be able to strip all non numeric characters from a text field. The field contains various forms of phone number in various formats. In order to search on it I am going to remove all non numeric characters from the input criteria and from the data being searched.
In order to do this I decided on using a SQL Server custom function: Pass in field. Loop through all chars, test against asci values for number range. return only numernic data concatenated into a string.
Are there any other more efficient ways of going about this?
Excluding Character From A Numeric String X34820
Sep 13, 2001hi I have a table which contain an id field as a char(20)
The content of this field is combination of string and numbers as follow
id flag
--------- -----
38383
88585
18834
x4820
z4892
t9494
I need to update the flag field where first character in the id field is not numeric. HOw can I do that.
thanks for your hlep
Thanks
AL
SQL Server 2008 :: Get Numeric Values From String
Jul 29, 2015Why can i get the numeric values from this string?
{_cpn}=1743; {_cpnll}=4511
Result: 1743, 4511
Position and len of the value can be different...
How Can I Conserve The Initial Zero When Convert Numeric To String Using STR()
May 28, 2006Sorry to raise a stupid question but I tried many methods which didwork.how can I conserve the initial zero when I try to convert STR(06) intostring in SQL statment?It always gives me 6 instead of 06.Thanks a lot.
View 15 Replies View RelatedTransact SQL :: Strip Non-numeric Characters From String
Jul 27, 2015If I have a string with the following values, I’d like to replace the non-numeric characters with a space.
Input
01234-987
012345678
01234 ext 65656
Tel 0123456
012345 898989
Output
01234 987
012345678
01234 65656
0123456
012345 898989
Return Only Numeric Characters From A String Column
Dec 4, 2007I have written this query to return only numeric characters from a string.
select *
from TableA
where isNumeric(Column_A) = 1
But I have discovered that the following
SELECT IsNumeric('-')
SELECT IsNumeric('£')
SELECT IsNumeric('$')
SELECT IsNumeric('+')
all return a value of 1. I do not want these in my result set.
If I use Column_A NOT LIKE '%[a-z]%' and Column_A <> '' I get characters such as "", ----- etc in my result set.
I would like a simple way of only returning numbers in my resultset.
Thanks for looking at this.
Significant Performance Difference If SELECT Command Contains User
Oct 25, 2006SQL 2000 Connection String:user id=MyUserName;password=MyPassword;initial catalog=MyDB;server=MyServer;Connect Timeout=30 This SELECT statement returns its 10 results nearly instantly:SELECT * FROM MyTableDitto from above, but completes in 30-40 seconds:SELECT * FROM [dbo].[MyTable]Ditto from above, but completes nearly instantly:
SELECT TOP 1000 * FROM [dbo].[MyTable] Obviously I have stopped using the [dbo] syntax in my SqlCommand's (SELECT's and EXECUTE's) but still would like to know why this is.vr, Rich
Problem: Performance Difference Between MSDE And SQL Express 2005
Feb 4, 2007Hello, all, I started out thinking my problems were elsewhere but as Ihave worked through this I have isolated my problem, currently, as adifference between MSDE and SQL Express 2005 (I'll just call itExpress for simplicity).I have, to try to simplify things, put the exact same DB on twosystems, one running MSDE and one running Express. Both have 2 Ghzprocessors (one Intel, one AMD), both have a decent amount of RAM(Intel system has 1 GB, AMD system has 512 MB), and plenty of GB offree disk space. MSDE is running on the Intel system, Express isrunning on the AMD system. To keep things fair I use the exact sameDB's and query on both systems. The DB's were created on MSDE so Isp_detach_db'd them from MSDE and then sp_attach_db'd them to Express(this is how MS says to do a "side-by-side" upgrade, so it'sacceptable to do so). After fighting problems in performancedifferences in different situations I have narrowed the problem downto this:Executing a simple select statement with join clause on the databasesyields a difference in execution time that is quite great. Using theExpress Management program I can run the query against either system(MSDE or Express, the two systems are connected via crossover cable toeliminate any network problems/issues). When running the queryagainst the MSDE system (which is over the network) I consistently get<20 ms response times on the query. When running the query againstthe Express installation (which is in shared memory) I consistentlyget 700 ms or longer response times. Both times are for the TotalExecution Time.The query is simply this: select db1.* from db1.owner.tablename as db1inner join db2.owner.tablename as db2 on db1.pkey = db2.someid wheredb1.criteria = 3So, gimme all the columns from one table in one DB (local to theinstallation), matching the records in another DB (also local to theinstallation), where one field in the first db matches a field in thesecond db and where, in the first db, one column value = 3.The first table has a total record count of 630 records of which only12 match the where clause. The second table has a total record countof about 2,700 of which only 12 match up on the 12 out of 630.Even though the data is the same and I've done the detach and attach,and even done the sp_updatestats, the difference in execution time isremarkable, in a bad way.Checking the Execution Plan reveals that both queries have the samesteps, but, on the MSDE system the largest consumer in the process isthe Clustered Index Scan of the 630 record table (DB1 in my queryexample), using 85%. The next big consumer is a Clustered Index Seekagainst the other table (2,700 rows), using 15%.The Execution Plan against the Express system reveals basically theexact opposite: 27% going to the Clustered Index Scan of the 630record DB1, and 72% going to the Clustered Index Seek of the 2,700record DB2.I'm sorry to be stupid but I have this information but I don't knowwhat to do with it. The best that I can tell from this is that thisis the source of my problems. My problems are that on my currentsystems that my clients use the data is returned to them faster thanthey can click the mouse and that the new system (that is, when theychose (or are forced by attrition) to move to Vista and thus Express2005) the screen pop is like 1.5 seconds. This creates poor userexperience. Worse, one process I allow the users to do goes fromtaking 14-30 seconds to over 4 minutes (all on the same machine withthe same OS and version of my program, so it's not a machine or OS ormy app problem).Anyway, I hope someone can shed some light on this now that I've paredit down some.Thanks in advance.--HC
View 9 Replies View RelatedHuge Performance Difference When Running UDF In Workstation Vs Server
Dec 13, 2007Hi,
I created a CLR UDF that returns a large number of rows, when I run it from my VPC (XP, SQL Server Developer Edition and 1GB Memory) it takes approx 2 min and 30 secs to start displaying the rows (Using Management Studio), when I run the same query in our development server (Win 2003, SQL Server Enterprise Edition, 8 GB Memory and 8 Processors) it takes more than 15 min to start displaying the results, does anybody have an idea why is this happening?
Thanks in advance
Performance Difference: Query Window V. Stored Procedure
Oct 24, 2007Executing the stored procedure took 45 seconds. But copying the code to a query window and setting up the variables (instead of parameters), it took 7 seconds.
In the query window, most of the processing cost (86%) is right up front in a "Distinct Sort." But in exec stored procedure, the cost for this step is 11% and the significant costs are in later "Table Scans."
I don't know why SQL Server would choose different execution plans when the code is identical in each.
Any quick insights?
Many thanks.
Query Performance Difference Between Sql Server 2005 And 2000
Aug 1, 2007Hi,
I'm having an issue with a query I'm running on Sql Server 2005. It's a semi-complex query involving an in-line table function and several left outer joins which are joined on to the results of the function call. Two of the left outer joins are then qualified in a where clause of the form where table.Col is not null; the idea is that the final result set contains data that has no match in those two tables.
The problem revolves around a where clause in the function and the last left outer join (ie, one of the ones qualified with where not null). When I alter the where clause of the function to further restrict the result set the function returns, the query times shoots up from 1 second to roughly 2-3 minutes. Note that the time the function takes to complete is not affected. The difference in time is purely down to what the query does with the results the function provides. Also note that the change to the where clause provides a subset of the original data; it does not add any more data (it actually restricts the original resultset by roughly 1000 rows).
I can bring the query speed back down again by removing the last left outer join - this join takes one of the columns from the function, and joins it to a small table - 924 rows. So it appears that this particular join is the cause of the issue, but only when using the resultset generated from the modified function query.
Now, as the thread title alludes, Sql Server 2000 and 2005 handle this differently, or appear to. When I execute this same query on a Sql 2000 machine, there's no apparent time differences, and the data that is returned is as expected. Does anyone have any suggestions as to what might be causing this and how I can fix it? I could simply return the larger resultset and use managed code to filter out the rows I don't want; however, I would like to get to the bottom of this, especially if it's going to effect future queries.
Cheers,
Chris
Transact SQL :: Huge Performance Difference For Same Select Between Environments
Jun 22, 2015I have encountered a problem with a specific set of tables. The same select yields slightly differing execution plans in two different environments (instances). But the slight variation seems to contain a huge differences in stats. I don't know the significance of these stats. The two tables have the exact same indices.
This is the selcet statement:
SELECT 'xx' FROM DUKS.dbo.Profiler
WHERE DNA_Løbenummer IN
(SELECT DNA_Løbenummer FROM DUKS.dbo.Effektregister
WHERE Sagsnummer = '2015-00002')
SQL Server 2012 :: Strip Non-numeric Characters From A String
Jul 15, 2015I am looking for the fastest way to strip non-numeric characters from a string.
I have a user database that has a column (USER_TELNO) in which the user can drop a telephone number (for example '+31 (0)12-123 456'). An extra computed column (FORMATTED_TELNO) should contain the formatted telephone number (31012123456 in the example)
Note: the column FORMATTED_TELNO must be indexed, so the UDF in the computed column has WITH SCHEMABINDING.... I think this implicates that a CLR call won't work....
Sql2k: Increment Numeric Part In Arbitrary String
Apr 11, 2003CREATE FUNCTION fctisnumericex(@c varchar(1))
RETURNS int AS
BEGIN
RETURN CASE WHEN ASCII(@c)>=ASCII('0') AND ASCII(@c)<=ASCII('9') THEN 1 ELSE 0 END END
CREATE FUNCTION fctstringincrement (@string varchar(255),@maxlen int)
RETURNS varchar(255) AS
BEGIN
DECLARE @@posr int
DECLARE @@posl int
DECLARE @@c varchar(1)
DECLARE @@token1 varchar(255)
DECLARE @@token varchar(255)
DECLARE @@token3 varchar(255)
DECLARE @@i int
/* emulates parts of the behaviour of s_modformatting::substringincrement */
/* 1. find the place where the numeric token starts from the right */
/* if we didn't find any non-numeric part then it might well be that the rightmost digit is already numeric */
IF dbo.fctisnumericex(SUBSTRING(@string,DATALENGTH(@string),1))=1
BEGIN
SELECT @@posr=DATALENGTH(@string)
END ELSE BEGIN
SELECT @@i=DATALENGTH(@string)
SELECT @@c=SUBSTRING(@string,@@i,1)
WHILE dbo.fctisnumericex(@@c)!=1 BEGIN
SELECT @@i=@@i-1
IF @@i<1 BEGIN BREAK END
SELECT @@c=SUBSTRING(@string,@@i,1)
END
SELECT @@posr=@@i
END
/* so have we got any numeric part inside that string? */
IF @@posr>0 BEGIN
/* yep. see how long it lasts */
SELECT @@i=@@posr
SELECT @@c=SUBSTRING(@string,@@i,1)
WHILE dbo.fctisnumericex(@@c)=1 BEGIN
SELECT @@posl=@@i
SELECT @@i=@@i-1
IF @@i<1 BEGIN BREAK END
SELECT @@c=SUBSTRING(@string,@@i,1)
END
/* separate now the parts of the string */
IF @@posl>1 BEGIN SELECT @@token1=SUBSTRING(@string,1,@@posl-1) END ELSE BEGIN SELECT @@token1='' END
SELECT @@token=SUBSTRING(@string,@@posl,@@posr-@@posl+1)
IF @@posr<DATALENGTH(@string) BEGIN SELECT
@@token3=SUBSTRING(@string,@@posr+1,DATALENGTH(@string)-@@posr) END ELSE BEGIN SELECT @@token3='' END
/* increment the numeric part */
SELECT @@token=convert(varchar(255),convert(int,@@token)+1)
END ELSE BEGIN
/* no numeric part at all. start with 1 at the end */
SELECT @@token1=@string
SELECT @@token='1'
SELECT @@token3=''
END
/* recompose the string and trim to max length if necessary */
RETURN SUBSTRING(@@token1+@@token+@@token3,1,@maxlen)
END
Stripping Non-numeric Chars From A Field String - SQL 2000
Jul 20, 2005Hi there - I would like to share this strip of code with our SQL 2000DBA community. The code below strips all non-numeric characters from agiven string field and rebuilds the string. Very simple, but I had tobuild it from scratch due the lack of info on this specific matter. Iam sure there are better solutions out there, although I will be gladif this script can help anyone. Feel free to modify and comment itback.Regards,Rubem Linn JuniorMCSE, .NET developerWeb Apps Specialist------------------------------------------------------- BEGIN---------------------------------------------------DECLARE @String_Length AS INTEGER -- Length of the given stringDECLARE @Original_String as NVARCHAR(50) -- The field to stripnon-numeric charsDECLARE @counter as integer -- simple counter variableDECLARE @Stripped_String as nvarchar(50) -- The field after beenstripped-- Get the length of the field (string) to be parsedSELECT @String_Length = len(someStringField) FROM SomeTable WHEREFilterID = 001-- Get the field (string) to be parsedSELECT @Original_String = someStringField FROM SomeTable WHEREFilterID = 001-- Set counter variable to 1SELECT @counter = 1-- Reset this variableSELECT @Stripped_String = ''-- Initiate loop from 1 to the Length of the given stringWHILE (@counter) <= @String_LengthBEGIN-- Check if the char in the lap is numericif substring(@Original_String,@counter,1) LIKE '[0-9]'BEGIN-- Load this variable with the non-numeric-- data stripped from the original stringselect @Stripped_String = @Stripped_String +substring(@Original_String,@counter,1)END-- Increment the counter by oneselect @counter = @counter + 1END-- Print the original string with all charactersPRINT @Original_String-- Print the numeric data that was stripped outPRINT RTRIM(LTRIM(@Stripped_String))
View 1 Replies View RelatedData Conversion - Numeric To String Loosing Precision
Oct 26, 2006Hi All,
i'm using a "data conversion" object to convert a numeric field to a string just before i save the record set to the database.
the problem is when this numeric field is > 0 it looses the precision on its decimal value.
example, if numeric value is 0.32
after converting this to a string, the new value will be : .32
it's lost the 0 infront of it. i can't do this converion in the query level because it's a derived field, so i need to convert it to a string before stroing it.
when converting to string i'm using the code page 1252 (ANSI - Latin I). i also tried with unicode string both looses this 0 infront.
can any one help on this?
Power Pivot :: Converting Text String To Numeric Value
Jun 11, 2015I have a column that I'm trying to call into a calculated measure to determine an expected contract amount (Terms in Month). The problem is that some of the terms are defined as text strings (MTM, Coterminous, One-time) while others are numbers (12, 36, etc). The entire column is recognized as text. I have a numeric value that management has agreed would be an acceptable substitution (MTM=1, Coterminous=6) and so on. I can't however, figure out how to convert those texts to a number since they are different data types. I've tried a nested IF statement, as well as a LOOKUPVALUE..I'm doing this in Power Pivot, so am limited to DAX formulas
View 4 Replies View RelatedExcel Source Numeric/string Data Problem
Oct 26, 2006i've been reading some problems with excel source data being force as
numeric type when there are string/numeric type in the data, but adding
IMEX=1 to the extended properties will fix this problem...this is true
but not in my case...
say my excel file have about 40 rows..if row 1-39 in column A are all
NULL and row 40 has a string in it, the string in row 40 will not be
converted and the excel source is forcing this column A data type to be
numeric..having IMEX=1 in there does not work..however..if i add a
string anywhere in row 1-8 in column A, the the string in row 40 will
be converted because the external data type now is a string..
anyone know how to solve this problem?
How To Remove Non-Numeric Or Non-alphameric Characters From A String In Sql Server 2005
May 16, 2007Hi to all,
I am having a string like (234) 522-4342.
i have to remove the non numeric characters from the above string.
Please help me in this regards.
Thanks in advance.
M.ArulMani
How To Remove Non-Numeric Or Non-alphameric Characters From A String In Sql Server 2005
May 16, 2007Hi to all,
I am having a string like (234) 522-4342.
i have to remove the non numeric characters from the above string.
Please help me in this regards.
Thanks in advance.
M.ArulMani