树立正确的SQL语句。
We have [world] table with following fields:[name], [continent], [area], [population], [gdp].
Tap on blue buttons to compose correct SQL query to perform specific task.
树立正确的SQL语句。
We have [world] table with following fields:[name], [continent], [area], [population], [gdp].
Tap on blue buttons to compose correct SQL query to perform specific task.