Error on an select statement "LIKE 'AC* %' in a VB.Net datatable


I get an error from a datatable select statement which contains a LIKE clause reading "... LIKE 'AC* %' ..."

The error reads "the string pattern AC* % is invalid".

Why ? * is not a wild card, so where is the problem ?

My application is written in VB.Net (VS 2013), it runs on Windows Server 2008 R2.
The same statement has worked on about another 400 selects with other data, where the part before the space did not have a * at the end.

Thanks for help
bthouinIT Analyst and developerAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
I suspect there's something else syntactically wrong here.  Can you post more of your query?
käµfm³d 👽Commented:
What do you mean by "datatable"? Do you mean:  DataTable? If so, then both ? and * are wildcards.
Both the * and % can be used interchangeably for wildcard characters in a LIKE comparison. If the string in a LIKE clause contains a * or %, those characters should be enclosed in brackets ([]).

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Paul MacDonaldDirector, Information SystemsCommented:
A simple...
SELECT * from TABLE WHERE SomeColumn LIKE 'AC* %' fine for me, but there's no harm in trying...
SELECT * from TABLE WHERE SomeColumn LIKE 'AC[*] %'
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Fernando SotoRetiredCommented:
Try just using one or the other, LIKE 'AC*' or LIKE 'AC%', I believe they both have the same meaning in a DataTable object.
bthouinIT Analyst and developerAuthor Commented:
Yes, I mean a DataTable within a DataSet, and a DataSet.Tables(DataTable).Select("< SQL where clause>"). And thanks for the link. Once more, the help for this is somewhere where you'd never look for it. I searched obviously for the LIKE clause, where I didn't find anything, because * is not a W3c standard wild cards. Why MS has it for a DataTable Select, but doesn't have it in T-SQL will remain an angering mystery. Maybe because Access uses it ?
You get thalf the points.

I suspected the bracketing could be the answer, but I was not sure, hence my question. Thanks.
You get half the points.

No, I precisely do not want 'AC* or 'AC%', because my Select was looking for a string beginning with the 3 characters 'AC*' followed by a space, so fixedly the string 'AC* ' and whatever follows, hence the 'AC* %' I ended up with, which confused MS's DataTable Select LIKE logic...
käµfm³d 👽Commented:
Once more, the help for this is somewhere where you'd never look for it. I searched obviously for the LIKE clause, where I didn't find anything, because * is not a W3c standard wild cards.
For your reference, the way that I found the documentation was that I started with the DataTable documentation, scrolled down to the Select documentation link, then, buried within that documentation page is a link to the Expression documentation, which is what I linked to above. So from my perspective, it is where I'd expect it to be.

Every once in a while some things get lost or buried in MS' documentation of the Framework. But in my experience, they usually do a good job of hyperlinking to related content (like with the Expression bit).
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