Question

CAST CONVERT typecasting function

Asked by: stef4s

Hey Experts

I've been forced to use MS Access (usually use MS SQL). Now I need to Average (AVG) a Field (type text 10)

Here is my SQL.

SELECT  AVG([cmi-core-score-raw]) AS [average],[OrgID] FROM [SCOTracking]

SQL Error: -2147217913
Description: Data type mismatch in criteria expression.


Ok now in MS Sql Server I just use either CAST or CONVERT functions.

I can't seem to find any documentation on typecasting for MS Access. (In Access 2003 help)

1) Please provide me with location of documentation (Preffered)
or
2) Provide functions with descriptions and examples.

Thanks

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Asked On
2005-08-31 at 06:51:52ID21546249
Tags

access

,

cast

Topic

Microsoft Access Database

Participating Experts
3
Points
125
Comments
11

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Answers

 

by: datamarkcsPosted on 2005-08-31 at 06:57:50ID: 14793750

The function to use (or lookup in the help system) is cint or clong. These mean convert to integer or convert to long. There are more conversion functions. Look up functions. Of course, after you convert your text field to numbers, then you can average them.  

 

by: peter57rPosted on 2005-08-31 at 07:01:08ID: 14793789

stef4s,

What are trying to convert?
Is [cmi-core-score-raw] a number field?
If its a number in a text field then you could use:

 SELECT  AVG(val([cmi-core-score-raw])) AS [average],[OrgID] FROM [SCOTracking] group by orgid

Note the addition of the Group By.

Pete

 

by: datamarkcsPosted on 2005-08-31 at 07:07:05ID: 14793851

Sorry, that is clng - not clong. I knew that didn't look right when I typed it. - Mark

 

by: GreymanMSCPosted on 2005-08-31 at 07:23:02ID: 14794027

Actually, you do not need to explicitly convert the text to numeric format as it will be done implicitly by the AVG function.

Nor will it actually help to try explicitly converting the values.  The DataType mismatch error occurs if at least one of the [cmi-core-score-raw] values being averaged is not numerical, and thus cannot be converted either way.

What you need to do is to ensure that you are only trying to average values that can be converted.  To do this, simply use the IsNumeric function to filter out the junk.

  SELECT AVG([cmi-core-score-raw]) AS [average],[OrgID]
  FROM [SCOTracking]
  WHERE IsNumeric([cmi-core-score-raw])
  GROUP BY [OrgID];

 

by: stef4sPosted on 2005-08-31 at 07:56:58ID: 14794435

clng is a vb typecasting function. I needed the SQL typecasting function.

Greyman you are also correct. But I needed "" zero length strings to be cast to 0

Thanks

 

by: peter57rPosted on 2005-08-31 at 08:04:51ID: 14794511

'I needed the SQL typecasting function'

Jet SQL does not have functions.  You use vba functions if you are running the query in Access.

Pete

 

by: GreymanMSCPosted on 2005-08-31 at 16:23:37ID: 14798616

To cast null strings as 0 use:

  SELECT AVG(IIF(Nz[cmi-core-score-raw],'')='',0,[cmi-core-score-raw]) AS [average],[OrgID]
  FROM [SCOTracking]
  WHERE IsNumeric([cmi-core-score-raw]) Or Nz([cmi-core-score-raw],'')=''
  GROUP BY [OrgID];

 

by: stef4sPosted on 2005-08-31 at 23:33:31ID: 14799773

peter57r AVG(),COUNT(),SUM() etc are SQL aggregate functions. I don't recall VB having these functions.

 

by: peter57rPosted on 2005-08-31 at 23:49:57ID: 14799821

Yes- my cooment was too general;
I was thinking in terms of the many everyday functons which we use in VB and which exist in one way or another in T-SQL and other SQL dialects but do not exist in Jet SQL which relies on the functions of the hosting programming environment.


Pete

 

by: stef4sPosted on 2005-09-01 at 00:34:33ID: 14799982

do you have any good links to SQL Jet help resources?

 

by: peter57rPosted on 2005-09-01 at 01:26:07ID: 14800199

There is a whole chapter in online Help in Access.

Pete

20120131-EE-VQP-002

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