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Resolver II
Resolver II

filter SQL Date: filter on no date / date zero

Not working:






If a gallery shows a record/item with a blank vetrek_datum:

If I put a label in a gallery Day(Thisitem.vertrek_datum) it does say "0"'

If I put a label in a gallery Text(Thisitem.vertrek_datum) it does say ""' (nothing)

If I put a label in a gallery IsBlank(Thisitem.vertrek_datum) it does say True


What will?

I read messages about date filtering SQL tables and I have to say upfront: changing the SQL database is *not* an option for me.


Filtering on vertrek_datum < 01-01-2000 would also work for me but then the server connection throws errors and I read averywhere that sql date comparing with < and > will not work.


The only filter that does work is if I filter on a specific date and do

Text(vertrek_datum;"dd-mm-yyyy") = "23-02-2017"


vertrek_datum=DateValue("23-02-2017") does not work either


Additional info: 

If I do  ClearCollect(collectSQLDates;ShowColumns('[dbo].[asiel_verblijf]';"vertrek_datum")) it appears dates are in format "d-m-yyyy" when inspecting collectSQLDates

Filter('[dbo].[asiel_verblijf]';IsBlank(Text(vertrek_datum;"[$-nl-NL]d-m-yyyy"))) does not work either


I I do

I get a number of hits where vertek_datum is in the 2017s

If I do


I get no hits, while there are records with vetrek_datum=0

Resolver II
Resolver II

Re: filter SQL Date: filter on no date / date zero

The problem is too silly to bother with probably.

I worked around it like this


First I made a subset

&& kennel_asiel_id<= _last_kennel_asiel_id

Since records represent stays in an animal shelter and i want to find animals that did not leave yet (vertrek_datum=0) I may hopefully assume that this filter doesn't exclude animals that have been there extremely long.

Now I have a subset of 500 on which some of the filters that failed earlier do work. That absolutely none worked was because when I was using a filter with warning only the first 500 records were considered and none fell in the right category I guess because of the delegation thingie.

Now I can filter the subset in the items of the gallery like this:

Filter(KennelRecords;Day(vertrek_datum)=0) and I get the results I expected

So if I would add this filter to the previous filter I get a delegation warning and nothing shows up, the animals that have no vertrek_datum (date of leaving) are in the bottom part of the table of course.

mmm I cannot rember so much trouble looking for records with no date from my dbase4,clipper,delphi days; strange idea of progress

Community Support
Community Support

Re: filter SQL Date: filter on no date / date zero

Hi @HansHeintz ,

Is your problem caused mainly by delegation?

When using large data set, you need to use delegable funtions. Otherwise, the app will not perform well.

Using non-delegable functions, the app can only deal with at most 2000 records.

Here's doc about delegation and delegable funtions in SQL Server:


Best regards,

Community Support Team _ Phoebe Liu

Community Support Team _ Phoebe Liu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Resolver II
Resolver II

Re: filter SQL Date: filter on no date / date zero

Are yout trying to explain to me that it is normal that filtering a table on a date field being empty is a problem?

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