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Stupid MS Access!!!

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Yoko
Brolly Dolly



Joined: 25 Feb 2007
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PostPosted: 10:34 - 23 Nov 2007    Post subject: Stupid MS Access!!! Reply with quote
Right I'm trying to write a query that if a form tickbox is ticked it applies a certain criteria to a field and if its not ticked it returns everything (as if no criteria was specified).

I tried:

Code:
Is NOT Null


Which worked as expected... Doesnt return the empties so...

Code:
Is NOT Null OR Is Null


Again worked as expected... Returns everything...

However...

Code:
IIf ( True, Is Not Null, "Some Criteria" )


Returns Nothing...

Similarly...

Code:
IIf ( True, Is Not Null or Is Null, "Some Criteria" )


Comes back with...

Quote:
The expression is typed incorrectly or is too complex


Where is the logic in that?!?!

Confused Evil or Very Mad
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 11:24 - 23 Nov 2007    Post subject: Reply with quote
Hi

Err, that isn't IIF syntax.

Should be iif ( condition, value_if_true, value_if_false ).

Yours seems to be saying if True is True then return "Is Null Or Is Not Null" (god knows what it would try and return).

All the best

Keith
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JonB
Afraid of Mileage



Joined: 03 Jun 2004
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PostPosted: 11:30 - 23 Nov 2007    Post subject: Reply with quote
And why would you be using database software?

Haven't got 2 new CD's recently have you? Razz
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Yoko
Brolly Dolly



Joined: 25 Feb 2007
Karma :
PostPosted: 11:58 - 23 Nov 2007    Post subject: Reply with quote
Kickstart wrote:
Hi

Err, that isn't IIF syntax.

Should be iif ( condition, value_if_true, value_if_false ).

Yours seems to be saying if True is True then return "Is Null Or Is Not Null" (god knows what it would try and return).

All the best

Keith


Err not really, the condition is a questions which returns true or false, I've simply left out the question and given it the answer.

Eg:

IIf ( True, do a, do b ) will 'do a' likewise

IIf ( False, do a, do b ) will 'do b'

I dont actually use that statement in my query, it was just do demonstrate that 'Is Not Null' doesnt work when imbedded in an IIf statement.

Why can I use it in normal criteria and not in an if statement. Doesnt make sense to me.

What I want is an IIf statement that if a button in my form is ticked no criteria is specified (and therefore everything is returned), if its unticked then a list box becomes enabled and the user specifies a criteria from the list box which is then passed to the criteria in the query.

'Is Null or Is not Null' returns everything, which is what I want it to do if the button is ticked.

Is null = Everything that is empty

Is not null = Everything that is not empty

Is null or is not null = Everything that is empty or is not empty

Saying IIf ( 'button ticked' (aka true Wink) , , 'criteria from list box')

Is the same as saying...

IIf ( 'button ticked', "", 'criteria from list box')

In which case when the button is ticked it will return everything with an empty string in that field. Which is not what I want...

Anyway I've now overcome my problem a different way but still doesnt make sense why you can say "something" in an IIf statement but not 'is null' or 'is not null' or 'is null or is not null'

Jon B wrote:
And why would you be using database software?

Haven't got 2 new CD's recently have you? Razz


Shifty
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 13:14 - 23 Nov 2007    Post subject: Reply with quote
Hi

"Is Null" and "Is Not Null" are SQL, while "IsNull" is VBA. IIF if VBA code so presume you would need the VBA check within there rather than the SQL check.

All the best

Keith
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The last post was made 18 years, 185 days ago. Instead of replying here, would creating a new thread be more useful?
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