Question

Concatenate filed and check for when is value is NULL

Asked by: jsctechy

hi there,
I have create i field that is compose by three differents fields but when it runs i have some NULL valkues which is ok. What i want to do is when those values ocurr then get some other field and place instead of the NULL value.

for instance i have this Concatenate field:
SELECT
             ...

Field_1 + ' ' ISNULL (Field_2, ' ') + ' ' + ISNULL(Field_3, ' ') as FIELDS_1_2_3

From
           ...

and if i want to do this if can be done what would be the approach?
...
Field_1 + ' ' ISNULL (Field_2, ' ') + ' ' + ISNULL(Field_3, ' ') as FIELDS_1_2_3,
ISNULL(FIELDS_1_2_3, Field_5) as UPDATE_FIELD
...

if i tun this the way it is then i would got an error saying that invalid column name FIELDS_1_2_3

is there a way to do what i'm trying to achiev here?

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Asked On
2007-01-31 at 07:15:12ID22143696
Tags

concatenate

,

null

,

isnull

Topic

MS SQL Server

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: cognos79Posted on 2007-01-31 at 07:18:46ID: 18436419

enclose fields_1_2_3 inside brackets:

Field_1 + ' ' + ISNULL (Field_2, ' ') + ' ' + ISNULL(Field_3, ' ') as [FIELDS_1_2_3],
ISNULL(FIELDS_1_2_3, Field_5) as UPDATE_FIELD

 

by: aneeshattingalPosted on 2007-01-31 at 07:20:41ID: 18436435

I am not sure what exactly u r looking for


SELECT  ( Field_1 + ' ' ISNULL (Field_2, ' ') + ' ' + ISNULL(Field_3, ' ')  ) as FIELDS_1_2_3
FROM urTable


should work

 

by: jsctechyPosted on 2007-01-31 at 07:24:21ID: 18436468

COGNOS79,

if i do it that way i still got this: Server: Msg 207, Level 16, State 3, Line 1
Invalid column name 'FIELDS_1_2_3'.

 

by: Mr_PeerapolPosted on 2007-01-31 at 07:24:46ID: 18436471

No, you cannot refer to the alias column in the same SELECT statement. You will need to do something like this:

SELECT a.*, ISNULL(a.FIELDS_1_2_3, Field_5) as UPDATE_FIELD
FROM
(
SELECT ...
Field_1 + ' ' ISNULL (Field_2, ' ') + ' ' + ISNULL(Field_3, ' ') as FIELDS_1_2_3,
...
FROM your_table
) a

 

by: jsctechyPosted on 2007-01-31 at 07:26:08ID: 18436477

aneeshattingal,

yeah that parts works, but if want to replace the NULL value create on the new field "FIELDS_1_2_3" and replace for anything else if do ocurr how can i do this if can be done?

 

by: jsctechyPosted on 2007-01-31 at 07:28:49ID: 18436491

Mr_Peerapol,

That was my idea at the begining but the select statement is huge and not to mention de from part. It takes data from a different server and is a little confusing.

 

by: Mr_PeerapolPosted on 2007-01-31 at 07:30:44ID: 18436504

Sorry, but that's the only way to go. Unless you are writing a stored procedure, you could use a temporay table or a table variable to hold your immediate result. Then, you could query from the temp table for your output.

 

by: jsctechyPosted on 2007-01-31 at 07:45:31ID: 18436651

well, what am i goignt o do is create views with the fields i need and then probably try to see if i can get around this problem that way
thanks anyway from your help.

20120131-EE-VQP-002

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