Accepting an empty field as a parameter in LIKE

Here is an SQL statement which accepts parameters from two
text fields and combines them in an AND. The database fields are
"subject" and "class". It works fine when something valid is
supplied for each parameter. Leaving either parameter as a blank
returns nothing. I'd like the user to optionally allow one (or
both) of the parameters to be left empty - as a "don't care". Thus,
if there were several parameters - the user could just supply
content only for the fields of interest.
SELECT *
FROM dlib
WHERE (Subject LIKE %MMColParam% AND class LIKE %QTest%)
Can I do that??
Ron

You could try wrapping them in an ISNULL. Could be a bit
fiddly, and it
would depend on the optional parameters in the ISNULL, but it
would be worth
exploring. Perhaps someone has a better tried and tested
solution.
Pat.
"tevron" <[email protected]> wrote in
message
news:fat3nj$7eb$[email protected]..
> Here is an SQL statement which accepts parameters from
two text fields and
> combines them in an AND. The database fields are
"subject" and "class". It
> works fine when something valid is supplied for each
parameter. Leaving
> either
> parameter as a blank returns nothing. I'd like the user
to optionally
> allow
> one (or both) of the parameters to be left empty - as a
"don't care".
> Thus, if
> there were several parameters - the user could just
supply content only
> for the
> fields of interest.
>
> SELECT *
> FROM dlib
> WHERE (Subject LIKE %MMColParam% AND class LIKE %QTest%)
>
> Can I do that??
> Ron
>
>

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Here is an enhanced version.
--[SCRIPT report visible records]
Enregistrer en tant que Script: report visible records.scpt
déplacer le fichier créé dans le dossier
<VolumeDeDémarrage>:Users:<votreCompte>:Library:Scripts:Applications:AppleWorks 6:
Il vous faudra peut-être créer le dossier AppleWorks 6 et peut-être même le dossier Applications.
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menu Scripts > AppleWorks 6 > report visible records
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+++++++
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Move the newly created file into the folder:
<startup Volume>:Users:<yourAccount>:Library:Scripts:Applications:AppleWorks 6:
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Open your database
Make visibles the records to print.
menu Scripts > AppleWorks 6 > report visible records
The script creates a new WP document with the contents of these records.
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--=====
The Finder's Help explains:
To make the Script menu appear:
Open the AppleScript utility located in Applications/AppleScript.
Select the "Show Script Menu in menu bar" checkbox.
--=====
Yvan KOENIG (VALLAURIS, France)
2009/09/20
--=====
property myWP : "my report.cwk"
property doWhat : 1
1 = skip empty fields
2 = display fieldName for empty fields
3 = display fieldName and "unavailable" for empty fields
property liste : {}
property nomsChamps : {}
property nbf : missing value
--=====
on run
my nettoie()
tell application "AppleWorks 6"
activate
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set my liste to index of every record whose visible is true
end tell -- document 1
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if my liste is {} then error number -128
set nbf to count of my nomsChamps
tell application "AppleWorks 6"
make new document with properties {document kind:text document, name:myWP}
set nbr to count of my liste
repeat with rec from 1 to nbr
set the clipboard to my readRecord(myDB, rec)
tell document myWP
paste
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end repeat
end tell -- AppleWorks
my nettoie()
end run
--=====
on nettoie()
set my liste to {}
set my nomsChamps to {}
set nbf to missing value
end nettoie
--=====
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tell application "AppleWorks 6" to tell document d
set l_fiche to {}
repeat with f from 1 to nbf
set valF to value of field f of record r
if doWhat = 1 then
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if valF is unavailable then set valF to ""
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end repeat
end tell
return my recolle(l_fiche, return)
end readRecord
--=====
on recolle(l, d)
local t
set AppleScript's text item delimiters to d
set t to l as text
set AppleScript's text item delimiters to ""
return t
end recolle
--=====
--[/SCRIPT]
Yvan KOENIG (VALLAURIS, France) lundi 21 septembre 2009 15:32:47

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hi
i need to display some empty fields in the output txt file, in between teh normal database fields i am displaying
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second is f2 (11-35)
third field is empty i need todisplay as (12-45)
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closed got solution

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Application is
http://apex.oracle.com/pls/apex/f?p=70547
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Accepting an empty field as a parameter in LIKE

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