## query to count repating alphabet in a string

 Author Message saltpepo SSC-Enthusiastic Group: General Forum Members Points: 104 Visits: 64 declare @asd varchar(20) set @asd ='asdaaaadffa' Lowell SSC Guru Group: General Forum Members Points: 181753 Visits: 41569 saltpepo (9/21/2012)declare @asd varchar(20) set @asd ='asdaaaadffa'so do you want a count of the max number of repeats in the string for each letter?so a=4,s=1,d=1,f=2, or are you after just a single letter?or the count of all the 'a''s which would be 6? Lowell--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible! saltpepo SSC-Enthusiastic Group: General Forum Members Points: 104 Visits: 64 Hello,I need to count repeating alphabet onlya=6 thats it. Mark Cowne SSChampion Group: General Forum Members Points: 14641 Visits: 26567 `declare @asd varchar(20)set @asd ='asdaaaadffa'select len(@asd) - len(replace(@asd,'a',''))` ____________________________________________________Deja View - The strange feeling that somewhere, sometime you've optimised this query beforeHow to get the best help on a forumhttp://www.sqlservercentral.com/articles/Best+Practices/61537 Lowell SSC Guru Group: General Forum Members Points: 181753 Visits: 41569 saltpepo (9/21/2012)Hello,I need to count repeating alphabet onlya=6 thats it.well, 'f' repeats as well in your example.the easiest way for the count is simply `SELECT LEN(@asd) - LEN(REPLACE(@asd,'a',''))` Lowell--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible! Lowell SSC Guru Group: General Forum Members Points: 181753 Visits: 41569 Mark-101232 (9/21/2012)`declare @asd varchar(20)set @asd ='asdaaaadffa'select len(@asd) - len(replace(@asd,'a',''))`oh your fast on the draw there, partner! Lowell--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible! saltpepo SSC-Enthusiastic Group: General Forum Members Points: 104 Visits: 64 Cool Guys u rock.Could you give some good links to learn sql basics Mark Cowne SSChampion Group: General Forum Members Points: 14641 Visits: 26567 Lowell (9/21/2012)Mark-101232 (9/21/2012)`declare @asd varchar(20)set @asd ='asdaaaadffa'select len(@asd) - len(replace(@asd,'a',''))`oh your fast on the draw there, partner!Yee-Haa! ____________________________________________________Deja View - The strange feeling that somewhere, sometime you've optimised this query beforeHow to get the best help on a forumhttp://www.sqlservercentral.com/articles/Best+Practices/61537 Lowell SSC Guru Group: General Forum Members Points: 181753 Visits: 41569 saltpepo (9/21/2012)Cool Guys u rock.Could you give some good links to learn sql basicsa lot of great guys here have put together a bunch of "stairways" series on many of the SQL subjects that give great step by steps and walk throughs;take a look here:SQL Server Stairways Atriclesthere's one that starts with t-SQL basics, and many on specific usages;Stairway to TSQL DML Lowell--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible! ChrisM@Work SSC Guru Group: General Forum Members Points: 96137 Visits: 20661 Big hammer;`DECLARE @asd VARCHAR(20)SET @asd = 'asdaaaadffa'SELECT Letter, Occurrences = COUNT(*)FROM ( SELECT Letter = SUBSTRING(@asd,n,1) FROM (SELECT TOP(LEN(@asd)) n = ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM sys.all_columns) tally) dGROUP BY LetterORDER BY Occurrences DESC` “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail ShawFor fast, accurate and documented assistance in answering your questions, please read this article.Understanding and using APPLY, (I) and (II) Paul White Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff ModenExploring Recursive CTEs by Example Dwain Camps

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