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SQL Query - Update varchar ID's...confused.com

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learning_sql

Posted Wednesday, March 13, 2013 9:20 AM

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Hi,

So I have been replacing an old database of ours with a new one - it has all gone relatively well. The new database structure etc is far better, far more effecient and well awesome. unfortunately something I couldn't change was the ID structure ( the users wanted the same data presented to them a lot better).

My problem - I have had to rename tables/queries/stored procedures/triggers to follow a new convention, which is fine, unfortunately I would "really" like to change 1 tables ID:

Sample ID's:

AG001/1/P1      
AG002/1/P1      
AG003/1/P1      
AG004/1/P1      
AG006/1/P1      
AG007/1/PO1     
AG008/1/P01     
AG009/1/P01     
AG010/1/P01     
AL001/1/P1      
AL002/1/P1      
AL003/1/P1      
CC013/1/P01

As you can see they are a pain in the..It basically mirrors three tiers (each tier is a section between the slashes). I would like to change the ID's in the final tier to the following:

AG001/1/L1      
AG002/1/L1     
AG003/1/L1      
AG004/1/L1      
AG006/1/L1      
AG007/1/LO1     
AG008/1/L01     
AG009/1/L01     
AG010/1/L01     
AL001/1/L1      
AL002/1/L1      
AL003/1/L1      
CC013/1/L01

I find this quite difficult to explain, the first XX000 is the 1st tier, the /1/ is the second tier and the X01 or X1 or X001 is the final tier (the final tier is the messiest due to human error). Unfortauntely there are too many records to edit manually. I have tried looking into using CHARINDEX/REPLACE/SUBSTR which are helpful - the following provides me with the final tier which I then need to edit - however how can I go and edit to the new format.

Used in a cursor:

	RIGHT(@ID, CHARINDEX('/', REVERSE(ID)) - 1)

I have also thought about simply recreating the final tier ID's from scratch, so they all follow Lnnn - this would be neater but again I unfortauntely don't know how to do this using SQL?

Now I hold the 2nd tiers ID in another column

Perfect results:

AG001/1/L001
AG001/2/L001
AG001/2/L002
AG001/2/L003
CE001/1/L001
CE002/1/L001

Post #1430467

Lowell

Posted Wednesday, March 13, 2013 9:30 AM

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Last Login: Today @ 7:00 AM
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ok, if you are sure there is always three sections to your ID's, here's one way to do it:

with myCTE (ID)
AS
(
SELECT 'AG001/1/P1' UNION ALL
SELECT 'AG002/1/P1' UNION ALL
SELECT 'AG003/1/P1' UNION ALL
SELECT 'AG004/1/P1' UNION ALL
SELECT 'AG006/1/P1' UNION ALL
SELECT 'AG007/1/PO1' UNION ALL
SELECT 'AG008/1/P01' UNION ALL
SELECT 'AG009/1/P01' UNION ALL
SELECT 'AG010/1/P01' UNION ALL
SELECT 'AL001/1/P1' UNION ALL
SELECT 'AL002/1/P1' UNION ALL
SELECT 'AL003/1/P1' UNION ALL
SELECT 'CC013/1/P01')

SELECT 
PARSENAME(REPLACE(ID,'/','.'),3) As Tier1,
PARSENAME(REPLACE(ID,'/','.'),2) As Tier2,
PARSENAME(REPLACE(ID,'/','.'),1) As Tier3
FROM myCTE

and you could consider putting calculated columns on your table to make the teirs a little easier to access:


ALTER TABLE MYTABLE ADD Tier1 AS PARSENAME(REPLACE(ID,'/','.'),3) PERSISTED
ALTER TABLE MYTABLE ADD Tier2 AS PARSENAME(REPLACE(ID,'/','.'),2) PERSISTED
ALTER TABLE MYTABLE ADD Tier3 AS PARSENAME(REPLACE(ID,'/','.'),1) PERSISTED

Lowell

--There is no spoon, and there's no default ORDER BY in sql server either.
Actually, Common Sense is so rare, it should be considered a Superpower. --my son

Post #1430478

ryan.mcatee

Posted Wednesday, March 13, 2013 9:36 AM

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Group: General Forum Members
Last Login: Yesterday @ 9:35 AM
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You appear to have a violation of normal form by storing more than one piece of data in a single column. I think, ideally, you would want a table that had each piece of information stored in it's own column.

Col1, Col2, Col3
AL003, 1, P1
CC013, 1, P01
Etc...

The application that uses this data could then either access it through a stored procedure or view:

CREATE VIEW dbo.something
AS
SELECT Col1 + '/' + Col2 + '/' + Col3
FROM table
GO

And the results of querying dbo.something would look like...

AL003/1/P1
CC013/1/P01

Another option would be to create a computed column on the table that would concatenate the three data.

But to answer your question, I think you want an update that looks something like this?

UPDATE table
SET   columnname=PARSENAME(replace(columnname,'/','.'),3)
     + '/'
     + PARSENAME(replace(columnname,'/','.'),2)
     + '/'
     + REPLACE(PARSENAME(replace(columnname,'/','.'),1), 'P', 'L')

It's messy and that is an artifact of trying to tease out the different pieces of data stored in the column.

Post #1430483

learning_sql

Posted Wednesday, March 13, 2013 11:15 AM

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Group: General Forum Members
Last Login: Thursday, April 04, 2013 5:23 AM
Points: 35, Visits: 127

If I wanted to replace the id structure (to clean up the data) to the form Lnnn (AG001/1/L001 etc) - is there a way I could do this.

I realise I would wipe the current ID's and then use my 2nd tier ID column (AG001/1) to build the new ID....

So for each ID in column "as_id" create a new id in column ld_id suffixing a 3 digit incremental number on the end of L.......When the as_id changes reset the increment to 0...so it would look like this (in an ideal world):

LD_ID COLUMN       AS_ID COLUMN
AG001/1/L001          AG001/1
AG001/1/L002          AG001/1
AG001/1/L003          AG001/1
AG001/2/L001          AG001/1
AG001/2/L002          AG001/1
CE001/1/L001          CE001/1

Post #1430538

Lowell

Posted Wednesday, March 13, 2013 11:23 AM

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Last Login: Today @ 7:00 AM
Points: 11,629, Visits: 27,697

oops i missed that part;
doing something like SELECT RIGHT('0000' + SomeString,3) will give you stuff like 002 with preceeding zeros;
then it's the find and replace you were after.

i think this slices up teh peices, so you can decide how you wnat them reassembled:

with myCTE (ID)
AS
(
SELECT 'AG001/1/P1' UNION ALL
SELECT 'AG002/1/P1' UNION ALL
SELECT 'AG003/1/P1' UNION ALL
SELECT 'AG004/1/P1' UNION ALL
SELECT 'AG006/1/P1' UNION ALL
SELECT 'AG007/1/PO1' UNION ALL
SELECT 'AG008/1/P01' UNION ALL
SELECT 'AG009/1/P01' UNION ALL
SELECT 'AG010/1/P01' UNION ALL
SELECT 'AL001/1/P1' UNION ALL
SELECT 'AL002/1/P1' UNION ALL
SELECT 'AL003/1/P1' UNION ALL
SELECT 'CC013/1/P01')

SELECT 
PARSENAME(REPLACE(ID,'/','.'),3) As Tier1,
PARSENAME(REPLACE(ID,'/','.'),2) As Tier2,
'L' + RIGHT('000' + REPLACE(REPLACE(PARSENAME(REPLACE(ID,'/','.'),1),'P','') ,'L',''),3) As Tier3
FROM myCTE

Lowell

--There is no spoon, and there's no default ORDER BY in sql server either.
Actually, Common Sense is so rare, it should be considered a Superpower. --my son

Post #1430541

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