user: Question: What's the average destroyed with a 1990 over 12, more than 1 damaged, 6 survivors, and a to Iran less than 4?
Columns: ['Aircraft', '1990', 'destroyed', 'damaged', 'to Iran', 'survived']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['France Mirage F1 EQ', 76.0, 23.0, 6.0, 24.0, 23.0]
SQL:

assistant: SELECT AVG("destroyed") FROM "Table" WHERE "1990" > 12.0 AND "damaged" > 1.0 AND "to Iran" < 4.0 AND "survived" = 6.0;