Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_70117 ( "Rank" real, "Company" text, "Revenues (US$ billion)" real, "Profit (US$ billion)" real, "Assets (US$ billion)" real, "Market value (US$ billion)" real )

### Question ###
What is the average market value with a revenue greater than 6.2, a Company of national bank of greece, and a Rank smaller than 1?

### Accurate SQL ###

SELECT AVG("Market value (US$ billion)") FROM table_70117 WHERE "Revenues (US$ billion)" > '6.2' AND "Company" = 'national bank of greece' AND "Rank" < '1'