Question

Select Column Name that is the same as a variable in Pervasive SQL?

Asked by: syeager305

I want to select an entire column that is the same as my variable.  I was given this solution, whihc works, but not for Pervasive SQL, any thoughts?

declare @column vachar(1000)
@column = concat(Month+" "+Year)
declare @sql varchar(1000)
set @sql = 'SELECT ' + @column + ' FROM Chart'
execute (@sql)

                                  
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Asked On
2009-08-11 at 09:04:38ID24643612
Tags

Btrieve

Topics

4GL Databases

,

Databases Miscellaneous

,

SQL Query Syntax

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: ToddBeaulieuPosted on 2009-08-11 at 09:14:36ID: 25070641

Not specific to any DB, you're building a column name that has a space in it. You'll need to surround it with something. In the MS world, it's brackets:

[My Col Name]

That's a strange column name you've got there.

 

by: syeager305Posted on 2009-08-11 at 09:16:39ID: 25070666

Nevermind the space.  Is the syntax different for pervasive SQL, does it support variable names?

 

by: mirtheilPosted on 2009-08-11 at 10:23:20ID: 25071284

I'm confused by what you're trying to do.  
You can do something like this:

sSQL = "SELECT " + colname + " FROM tablename"

Then execute the statement.  You don't say what language or interface you are using.  

If you're column name is a SQL keyword, you need to enclose it in double quotes. For example:
create table t1 (f1 char(100), "table" char(10));
select "table" from t1

 

by: syeager305Posted on 2009-08-11 at 10:31:05ID: 25071360

I'm trying to do it through Crystal Reports into PeachTree, which uses a Pervasive SQL database.  

 

by: mirtheilPosted on 2009-08-11 at 10:34:15ID: 25071398

And what error or behavior do you see?

 

by: syeager305Posted on 2009-08-11 at 10:44:19ID: 25071488

Failed to retrieve data from the database.
Details: 42000:[Pervasive][ODBC Client Interface][LNA][Pervasive][ODBC
Engine Interface]Syntax Error: declare<< ??? >> @column vachar(1000)
@column = concat(Month+Year)
declare @sql varchar(1000)
set @sql = 'SELECT ' + @column + ' FROM Chart'
execute (@sql)

 

by: mirtheilPosted on 2009-08-11 at 11:01:58ID: 25071627

The only time DECLARE and EXECUTE can be used in PSQL is within a stored procedure.  
Pervasive uses the question mark (?) for parameters in queries.  I'm not familiar with Crystal so I'm not sure how it allows you to specify parameters and the values.  

20120131-EE-VQP-002

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