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Programming Interfaces
Data Management : Database Access : Joining tables : Specifying joins in ABL : Specifying the type of join
 
Specifying the type of join
The Record phrase that specifies the right-hand table of a join also indicates the type of join operation. A Record phrase specifies an inner join by default. To specify a left outer join, you include the [LEFT]OUTER–JOIN option anywhere in the Record phrase. Where you specify a list of multiple Record phrases in a record-reading statement, the join logic allows you to specify only one set of contiguous inner joins at the beginning (left side) of the list and one set of contiguous left outer joins at the end (right side) of the list. Each right-hand Record phrase of a left outer join must contain the OUTER–JOIN option up to and including the last left outer join in the list. For more information, see Mixinginner and left outer joins.