Splitting Strings Based on Patterns

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Splitting Strings Based on Patterns

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fregatepllada SSCommitted Points: 1702 More actions · Answer 1

Dwain you do not need CLR to use regex 🙂

There is an old way to call Vbscript library

From t-SQL code 😉

Jeff Moden SSC Guru Points: 1004403 More actions · Answer 2

fregatepllada (9/12/2014)
Dwain you do not need CLR to use regex 🙂
There is an old way to call Vbscript library
From t-SQL code 😉

sp_OA???

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Alan Burstein SSC Guru Points: 61141 More actions · Answer 3

Jeff Moden (9/12/2014)
fregatepllada (9/12/2014)
Dwain you do not need CLR to use regex 🙂
There is an old way to call Vbscript library
From t-SQL code 😉
sp_OA???

I suspect they were talking about: http://www.sqlservercentral.com/scripts/Miscellaneous/30963/

Either way, I don't think we can get that into an iTVF.

"I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code."

-- Itzik Ben-Gan 2001

fregatepllada SSCommitted Points: 1702 More actions · Answer 4

fregatepllada

SSCommitted

Points: 1702

September 13, 2014 at 4:09 am

#1745231

Yes, an antiquated COM way 🙂

g.britton SSChampion Points: 13863 More actions · Answer 5

Just thought I add my minimalist CTE-based tally table generator:

declare @howmany int = 50;

with n1(n) as (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) n(n)),

n2(n) as (select 1 from n1, n1 n),

n4(n) as (select 1 from n2, n2 n),

n8(n) as (select 1 from n4, n4 n),

N(n) as (select top(@howmany) ROW_NUMBER() over(order by (select 1)) from n8)

select n from N

Note that I prefer (1),(1),... to (0), (0), ... since the latter makes my eyes go funny.

Also note that order by (select 1) works as well as order by (select null) and is shorter to write (Ok, so I'm lazy!)

Finally, my resulting table is called N to reflect its origin in the set ℕ -- the natural numbers

Gerald Britton, Pluralsight courses

Dwain Camps SSC Guru Points: 86978 More actions · Answer 6

g.britton (11/6/2014)
Just thought I add my minimalist CTE-based tally table generator:
declare @howmany int = 50;
with n1(n) as (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) n(n)),
n2(n) as (select 1 from n1, n1 n),
n4(n) as (select 1 from n2, n2 n),
n8(n) as (select 1 from n4, n4 n),
N(n) as (select top(@howmany) ROW_NUMBER() over(order by (select 1)) from n8)
select n from N
Note that I prefer (1),(1),... to (0), (0), ... since the latter makes my eyes go funny.
Also note that order by (select 1) works as well as order by (select null) and is shorter to write (Ok, so I'm lazy!)
Finally, my resulting table is called N to reflect its origin in the set ℕ -- the natural numbers

How's this on your eyes?

declare @howmany int = 50;

with n1(n) as (select $ from (values ($),($),($),($),($),($),($),($),($),($)) n(n)),

n2(n) as (select $ from n1, n1 n),

n4(n) as (select $ from n2, n2 n),

n8(n) as (select $ from n4, n4 n),

N(n) as (select top(@howmany) ROW_NUMBER() over(order by (select $)) from n8)

select n from N

😛

Makes me see dollar signs.

My mantra: No loops! No CURSORs! No RBAR! Hoo-uh![/I]
My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.

Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St

g.britton SSChampion Points: 13863 More actions · Answer 7

dwain.c (11/6/2014)
How's this on your eyes?
declare @howmany int = 50;
with n1(n) as (select $ from (values ($),($),($),($),($),($),($),($),($),($)) n(n)),
n2(n) as (select $ from n1, n1 n),
n4(n) as (select $ from n2, n2 n),
n8(n) as (select $ from n4, n4 n),
N(n) as (select top(@howmany) ROW_NUMBER() over(order by (select $)) from n8)
select n from N
😛
Makes me see dollar signs.

I love it!

Gerald Britton, Pluralsight courses

Felix Pamittan Mr or Mrs. 500 Points: 535 More actions · Answer 8

Genius!

The "Numbers" or "Tally" Table: What it is and how it replaces a loop[/url]

Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs[/url]