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Opal | Level 21

Is usubjid a unique key in table adae?

 

Is usubjid a unique key in table adbmk?

 

Why is this a left join? The condition anl02fl="Y" will essentially transform it into an inner join.

PG
RAVI2000
Lapis Lazuli | Level 10
because I would like to see the subjects from left(adbmk) table alone. usubjid is the unique key for both the datasets.

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