SELECT
c.Name,
cl.*
FROM country AS c, countrylanguage AS cl
WHERE
c.Code = cl.CountryCode
| Name | CountryCode | Language | IsOfficial | Percentage |
| Aruba | ABW | Dutch | T | 5.3 |
| Aruba | ABW | English | F | 9.5 |
| Aruba | ABW | Papiamento | F | 76.7 |
| Aruba | ABW | Spanish | F | 7.4 |
| Afghanistan | AFG | Balochi | F | 0.9 |
| Afghanistan | AFG | Dari | T | 32.1 |
| Afghanistan | AFG | Pashto | T | 52.4 |
| Afghanistan | AFG | Turkmenian | F | 1.9 |
| Afghanistan | AFG | Uzbek | F | 8.8 |
| ... |
| 要选出某张表的全部列，写法是：tableName. * |