SOOI s002 sow sou s005 S006 sow [SQL i) 'NULL' F NULL SOOI sow NULL s005 SELECT FROM X...
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SOOI s002 sow sou s005 S006 sow [SQL i) 'NULL' F NULL SOOI sow NULL s005 SELECT FROM X WHERE NOT EXISTS (SELECT * FROM Y WHERE X. - F sool sow S005 S006 sool s005 F S003 s006 sou sou
