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Editorial Team
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Asked: 2026-05-12T18:01:33+00:00

What is the difference bettween SELECT a.AccountId FROM Accounts AS a JOIN domain as

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What is the difference bettween

SELECT a.AccountId FROM Accounts AS a JOIN domain as d;

and

SELECT a.AccountId
FROM Accounts AS a JOIN domain as d WHERE a.AccountId=d.AccountId;

I thought JOIN is an inner join which only matches when the left AccountId is == to the right AccountId. Wouldn’t the above be exactly the same? I got different results when typing it into MySQL (command line).

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  1. Editorial Team

    Your first statement doesn’t specify any join criteria at all, to make it equivalent you would need to change it to:

    SELECT a.AccountId FROM Accounts AS a 
JOIN domain as d on a.accountid = d.accountid;

    I think what your asking, but not sure, is whats the difference between old style joins

     SELECT a.AccountId FROM Accounts AS a, domain as d 
 where  a.accountid = d.accountid;

    And ANSI joins which is 

      SELECT a.AccountId FROM Accounts AS a 
  JOIN domain as d on a.accountid = d.accountid;

    And those are equivalent

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