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Reverse string without built in functions


Reverse string without built in functions

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RBarryYoung
RBarryYoung
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This is actually from Jacob Sebastiens Challenge #3, where the actual rules were: "Write a single query that can reverse the strings in this column without using the REVERSE() function".

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
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pshvets
pshvets
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My question is not a homework question. Smile
My background is BI Development on Oracle, Teradata, Unix platforms. I am simply learning MS SQL Server and T-SQL.

And thanks for all your help!

Pit.
Michael Valentine Jones
Michael Valentine Jones
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Maybe you should learn to use what is available in SQL Server, like REVERSE, instead of spending time duplicating what is already available.
GSquared
GSquared
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Michael Valentine Jones (4/15/2009)
Maybe you should learn to use what is available in SQL Server, like REVERSE, instead of spending time duplicating what is already available.



Nah. One of the best ways to learn the tricky parts of any engineering tool (and programming languages are definitely engineering tools) is to work out how to do something without using a pre-built answer.

Nails and screws are awefully convenient, but it's fun and educational to build a wooden cabinet without using any. Take away wood glue also, and it's a challenge for even a good woodworker, and fun. And it teaches you techniques you can use in other applications that might be more practical.

- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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jcrawf02
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GSquared (4/16/2009)
Michael Valentine Jones (4/15/2009)
Maybe you should learn to use what is available in SQL Server, like REVERSE, instead of spending time duplicating what is already available.



Nah. One of the best ways to learn the tricky parts of any engineering tool (and programming languages are definitely engineering tools) is to work out how to do something without using a pre-built answer.

Nails and screws are awefully convenient, but it's fun and educational to build a wooden cabinet without using any. Take away wood glue also, and it's a challenge for even a good woodworker, and fun. And it teaches you techniques you can use in other applications that might be more practical.


Pshaw! That's no challenge, just use duct tape.

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How best to post your question
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Tally Table:What it is and how it replaces a loop

"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."
GSquared
GSquared
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jcrawf02 (4/17/2009)
GSquared (4/16/2009)
Michael Valentine Jones (4/15/2009)
Maybe you should learn to use what is available in SQL Server, like REVERSE, instead of spending time duplicating what is already available.



Nah. One of the best ways to learn the tricky parts of any engineering tool (and programming languages are definitely engineering tools) is to work out how to do something without using a pre-built answer.

Nails and screws are awefully convenient, but it's fun and educational to build a wooden cabinet without using any. Take away wood glue also, and it's a challenge for even a good woodworker, and fun. And it teaches you techniques you can use in other applications that might be more practical.


Pshaw! That's no challenge, just use duct tape.


Well, I've found that when you try to use duct tape to reverse a character string, it leaves bits of glue all over your hard drives, and that's a bit of a problem...

- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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Vijaya Kadiyala
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check out the below link, This will give you the function to reverse a string with out using REVERSE.

http://blog.sqlauthority.com/2007/05/01/sql-server-user-defined-functions-udf-to-reverse-string-udf_reversestring/

I always prefer to use existing functions, if they are available instead of duplicating the function.. but again on the other had if we try to duplicate the logic it will increase our programming capabilities :;-)

I am confusingHehe

Thanks -- Vijaya Kadiyala
www.dotnetvj.com
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RBarryYoung
RBarryYoung
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jcrawf02 (4/17/2009)
GSquared (4/16/2009)
Michael Valentine Jones (4/15/2009)
Maybe you should learn to use what is available in SQL Server, like REVERSE, instead of spending time duplicating what is already available.



Nah. One of the best ways to learn the tricky parts of any engineering tool (and programming languages are definitely engineering tools) is to work out how to do something without using a pre-built answer.

Nails and screws are awefully convenient, but it's fun and educational to build a wooden cabinet without using any. Take away wood glue also, and it's a challenge for even a good woodworker, and fun. And it teaches you techniques you can use in other applications that might be more practical.


Pshaw! That's no challenge, just use duct tape.
Hmm, interesting idea... :-)

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
ChrisM@Work
ChrisM@Work
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Pinal Dave's reverse function has this code in it:
RETURN (REVERSE(@StringToReverse))

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For 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 Moden
Exploring Recursive CTEs by Example Dwain Camps
Michael Valentine Jones
Michael Valentine Jones
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OK, as long as we are doing useless SQL, I want to add numbers together without using any Arithmetic, Logical, Assignment, String, Bitwise, or Unary Operators or any Mathematical or Aggregate Functions.
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