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The fact that when it says INNER JOIN you can be sure of what it does and that it s supposed to be just that whereas a plain JOIN will leave you or someone else wondering what the

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No SQL exitem v rios tipos de JOIN qual a diferen a entre INNER JOIN LEFT JOIN CROSS JOIN RIGHT JOIN e FULL JOIN

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INNER JOIN gets all records that are common between both tables based on the supplied ON clause LEFT JOIN gets all records from the LEFT linked and the related record from the right

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This JOIN combines LEFT OUTER JOIN and RIGHT OUTER JOIN It returns rows from either table when the conditions are met and returns NULL value when there is no match In other

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If a filter enters in a JOIN condition functionally i e it is an actual join condition not just a filter it must appear in the ON clause of that join Worth noting If you place it in the WHERE clause

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Left Join and Left Outer Join are one and the same The former is the shorthand for the latter The same can be said about the Right Join and Right Outer Join relationship The

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1 Do you really want to be able to join the tables if a value is null Can t you just exclude the possible null values in the join predicate I find it hard to grok that rows in two tables can be

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Is it possible to do the following IF a 1234 THEN JOIN ON TableA ELSE JOIN ON TableB If so what is the correct syntax

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A CROSS JOIN produces a cartesian product between the two tables returning all possible combinations of all rows It has no ON clause because you re just joining everything