LEFT JOIN gets all records from the LEFT linked and the related record from the right table ,but if you have selected some columns from the RIGHT table, if there is no related records, these columns will contain NULL. The same can be said about the Right Join and Right Outer Join relationship. it is an actual join condition, not just a filter), it must appear in the ON clause of that join. Given Left Join and Left Outer Join Results You can join tables on specific columns, I think you got that far. The former is the shorthand for the latter. Um left join faz uma junção entre A e B onde a projeção INNER JOIN gets all records that are common between both tables based on the supplied ON clause. Column = 'TASK' and throw away the rest. idAgencia = Agencias. 1 Inner join matches tables on keys, but outer join matches keys just for one side. Если не находит, то присоединяет null.

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