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zero length string to zero - Mailing list pgsql-general

From Shadi Mal
Subject zero length string to zero
Date
Msg-id CABOJmNYZK6y9QB-M1Nme8ovQyHVTVdYFObTPaj=VKMiVRx490g@mail.gmail.com
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Responses Re: zero length string to zero
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Hi,
 I get zero length string in my result but I want to have zero value instead.
what can I do?
my query is:
         Count(unreadmandatory.course) AS nbrofmandatoryleft
           FROM unreadmandatory
          GROUP BY unreadmandatory.id

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