sql - Table name after parenthesis notation -

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i going through old-ish sql code else had written couldn't quite understand. have simplified structure here, if can walk me through going on, appreciated! may ignore specific column operations examples.

select table.*,   column1 - column2   'col1 - col2',   ...    columnn   'coln'    (select    ...    ) table

what don't understand final line. assuming definition of "table" in from (select ...) part, , ) table part indicates name of defined table.

thanks in advance!

an inner select needs alias name

select alias_name.* (    select * some_table ... ) alias_name

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