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    Absolutely correct. OUTER is allowed for ANSI-92 compatibility. Commented Jan 2, 2009 at 21:34
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    @LasseV.Karlsen wouldnt it be better to have INNER JOIN on the right and just JOIN on the left in the list of equivalents?
    – nawfal
    Commented May 1, 2013 at 14:55
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    @LasseV.Karlsen I just meant that the left side has the concise form and the right side has the expanded form. I thought it would make it coherent if you followed the same for JOINs as well.
    – nawfal
    Commented May 2, 2013 at 7:40
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    According to Standard SQL OUTER is also an optional keyword: <join type> ::= INNER | <outer join type> [ OUTER ]
    – dnoeth
    Commented Oct 12, 2015 at 15:56