Constants
The following constants are available globally.
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INNER JOIN type for combining records from two tables.
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RIGHT JOIN type for performing a join starting with the second (right-most) table and then any matching first (left-most) table records.
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LEFT JOIN type for performing a join starting with the first (left-most) table and then any matching second (right-most) table records.
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FULL JOIN type for all matching records from both tables whether the other table matches or not.