user: Question: What is the highest planetary mass having an RV (cm/s) of 65 and a Period (days) less than 21?
Columns: ['Stellar mass ( M☉ )', 'Planetary mass ( M⊕ )', 'Lum. (L 0 )', 'Type', 'RHAB ( AU )', 'RV (cm/s)', 'Period (days)']
Types: ['real', 'real', 'text', 'text', 'real', 'real', 'real']
Sample row: [0.1, 1.0, '8 × 10−', 'M8', 0.028, 168.0, 6.0]
SQL:

assistant: SELECT MAX("Planetary mass ( M⊕ )") FROM "Table" WHERE "RV (cm/s)" = 65.0 AND "Period (days)" < 21.0;