问题
Hia, I'm struggling a bit while forming some SQL queries. Currently I'm using:
InStrRev(TABLE.[_URL],"/")+1) AS OUTPUT
Given an input of a URL - I want to extract the last part eg:
www.url.com/some/text/here
Should return
here
There are always 3 slashes and while the snippet I posted works perfectly; only within access.
When I try and use this outside of access - I find errors - any advice on alternatives available to me?
回答1:
As you have discovered, SQL queries executed from within Access can use many VBA functions (like InStr() and InStrRev()) that are not natively supported by the Jet/ACE dialect of SQL. One of the most powerful aspects of Access' "extensions" to Jet/ACE SQL is that you can even write your own VBA functions and use them in Access queries.
Unfortunately, things can get a bit confusing when it comes to what functions are supported in "plain" Jet/ACE SQL because many of the names are the same. If we can use Left(), Right(), Mid(), etc. in queries against Jet/ACE databases executed outside of Access, then why not InStr() and InstrRev()? The answer is, unfortunately, "Just because.".
In your particular case I agree with Remou's comment that you'll probably just have to retrieve the entire column value in your query and then do the [equivalent of the] InStrRev()-related parsing afterward.
来源：https://stackoverflow.com/questions/15633533/using-instrrev-and-similar-functions-in-jet-ace-queries-outside-of-access