473,225 Members | 1,277 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,225 software developers and data experts.

Problem with case statement

With the syntax below, why is field1a not "A" if field1 does not
contain "_"

SELECT Field1a = CASE WHEN (field1 LIKE '%_%') THEN (charindex('_',
field1)) ELSE 'A' END, field1
FROM [Table1]

Sep 5 '05 #1
3 3089
<ch********@hotmail.com> wrote in message
news:11**********************@f14g2000cwb.googlegr oups.com...
With the syntax below, why is field1a not "A" if field1 does not
contain "_"

SELECT Field1a = CASE WHEN (field1 LIKE '%_%') THEN (charindex('_',
field1)) ELSE 'A' END, field1
FROM [Table1]


See LIKE and "Pattern Matching in Search Conditions" in Books Online - an
underscore is a wildcard for any single character, so you need to escape it
for a literal match:

LIKE '%[_]%'

Another issue is that CASE is an expression, so it can only return a single
data type - as you've written it, it could return either an int or a char,
so you would get a data type conversion error. See "Result Types" under CASE
in Books Online - you'll need to decide on a single return type, or perhaps
CAST the integer to a character type:

SELECT
Field1a = CASE
WHEN (field1 LIKE '%[_]%') THEN cast((charindex('_',field1)) as char(2))
ELSE 'A' END,
field1
FROM [Table1]

Simon
Sep 5 '05 #2
cheers simon

Sep 6 '05 #3
(ch********@hotmail.com) writes:
With the syntax below, why is field1a not "A" if field1 does not
contain "_"

SELECT Field1a = CASE WHEN (field1 LIKE '%_%') THEN (charindex('_',
field1)) ELSE 'A' END, field1
FROM [Table1]


In SQL _ is a wildcard for exactly one occurrance of one characater. Thus
%_% matches anything but the empty string. Change to %[_]% to get what you
want.

....by the way, CASE is an expression, not a statement, in SQL.

--
Erland Sommarskog, SQL Server MVP, es****@sommarskog.se

Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techinf...2000/books.asp

Sep 9 '05 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

68
by: Marco Bubke | last post by:
Hi I have read some mail on the dev mailing list about PEP 318 and find the new Syntax really ugly. def foo(x, y): pass I call this foo(1, 2), this isn't really intuitive to me! Also I...
10
by: JMorrell | last post by:
First post to this community so am not sure if this is the correct place. Here goes. I have a MS Access db that keeps track of employees sick and annual leave balances. In it, I have a report,...
5
by: Ritesh | last post by:
Hi All, According to my observation using SP_WHO2 in my database, some INSERT statements are getting blocked by SELECT statements. Though the blocking SELECT statement is having ReadPast hint,...
10
by: Chih-Hsu Yen | last post by:
I encountered a strange problem about switch-case statement. switch(cmd) { case 1: statements; break; case 2: statements; break; ... .... case 11: S1; S2; S3; statements;
5
by: Tim::.. | last post by:
Can someone tell me how I convert this simple SQL statement so I can use it in ASP.NET??? I have an issue with the quotation marks and wondered if there is a simple rule for converting the sql...
8
by: | last post by:
Hello, This is gonna sound real daft, but how do I test a Select Case statement for variants of a theme? Here's a snippet of my code... Select Case sUsr Case "Guest", "TsInternetUser",...
2
by: scole954387 | last post by:
Hi, I have a problem. I have written a SQL statement that has a nested select case statement on the 'where' clause to condition the results. ...
22
by: b_r | last post by:
Hi, I'm trying to make a simple operation (insert into DB) in VB 2005 and SQL Server. The code is as follows: Dim sConnectionString As String = _ "Data...
35
by: Chris | last post by:
Hi, I tried to create a class which must change the propety 'visible' of a <linktag in the masterpage into 'false' when the user is logged. But i get the error: "Object reference not set to an...
10
by: amitabh.mehra | last post by:
Hi I havent used MQT before. Read the online tips and tutorials but none seems to give any hint for my problem. I have a base table (base_table) as: st varchar(25) default...
1
isladogs
by: isladogs | last post by:
The next online meeting of the Access Europe User Group will be on Wednesday 6 Dec 2023 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, Mike...
0
by: veera ravala | last post by:
ServiceNow is a powerful cloud-based platform that offers a wide range of services to help organizations manage their workflows, operations, and IT services more efficiently. At its core, ServiceNow...
0
by: VivesProcSPL | last post by:
Obviously, one of the original purposes of SQL is to make data query processing easy. The language uses many English-like terms and syntax in an effort to make it easy to learn, particularly for...
3
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 3 Jan 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). For other local times, please check World Time Buddy In...
0
by: abbasky | last post by:
### Vandf component communication method one: data sharing ​ Vandf components can achieve data exchange through data sharing, state sharing, events, and other methods. Vandf's data exchange method...
2
by: jimatqsi | last post by:
The boss wants the word "CONFIDENTIAL" overlaying certain reports. He wants it large, slanted across the page, on every page, very light gray, outlined letters, not block letters. I thought Word Art...
2
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 7 Feb 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:30 (7.30PM). In this month's session, the creator of the excellent VBE...
0
by: stefan129 | last post by:
Hey forum members, I'm exploring options for SSL certificates for multiple domains. Has anyone had experience with multi-domain SSL certificates? Any recommendations on reliable providers or specific...
1
by: davi5007 | last post by:
Hi, Basically, I am trying to automate a field named TraceabilityNo into a web page from an access form. I've got the serial held in the variable strSearchString. How can I get this into the...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.