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SQL> select count(*) from c01d where c01d27='2' or c01d27='8';
Executed in 0.531 seconds
Executed in 0.515 seconds
Executed in 0.515 seconds
SQL> select count(*) from c01d where c01d27 IN ('2', '8');
Executed in 0.547 seconds
Executed in 0.516 seconds
Executed in 0.547 seconds