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Sql query behavior not as expected [DOC142] #145

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firebird-automations opened this issue Oct 9, 2019 · 1 comment
Closed

Sql query behavior not as expected [DOC142] #145

firebird-automations opened this issue Oct 9, 2019 · 1 comment
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@paulvink
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priority: major type: bug

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@firebird-automations
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firebird-automations commented Oct 9, 2019 •
edited by mrotteveel

Submitted by: Paweł Krzyżanowski (zpksoft)

in
https://firebirdsql.org/manual/nullguide-predicates.html

is code:

SELECT Farmer FROM Farms WHERE EXISTS
  (SELECT * FROM Landowners
   WHERE Landowners.Name = Farms.Farmer)

but not working:

SELECT Farmer FROM Farms WHERE EXISTS
  (SELECT * FROM Landowners
   WHERE Landowners.Name CONTAINING Farms.Farmer)

(and not working with like, result is NULL)

For example 'LISA' as Farmer and 'MONALISA' as Landowners.Name
'MONALISA' CONTAINING 'LISA' but EXISTS in this query returns NULL.
Alone EXISTS returns correct dataset.
@mrotteveel
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Without more details, this is not really answerable. It also looks like a support question which would be more suitable for https://groups.google.com/g/firebird-support

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