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From abyss
Subject concat returns null
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Msg-id 8f60d3bd0712180316r52dd88b9j4e092ee7b1a03d06@mail.gmail.com
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Responses Re: concat returns null  (tivvpgsqljdbc@gtech-ua.com)
Re: concat returns null  (Andrew Lazarus <drlaz@attglobal.net>)
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I don't know if it's bug or feature but
select 'test' || null as result
returns null,
so i need to case second parameter not to concat if it is null...

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