HackerRank【SQL1】

The CITY table is described as follows:

 

1、Revising the Select Query I

Query all columns for all American cities in CITY with populations larger than 100000. The CountryCode for America is USA.

SELECT * FROM CITY WHERE COUNTRYCODE = 'USA' AND POPULATION > 100000;

2、Revising the Select Query II

Query the names of all American cities in CITY with populations larger than 120000. The CountryCode for America is USA.

SELECT NAME FROM CITY WHERE COUNTRYCODE = 'USA' AND POPULATION > 120000;

3、Select All

Query all columns (attributes) for every row in the CITY table.

select * from CITY;

4、Select By ID

Query all columns for a city in CITY with the ID 1661.

select * from CITY where ID = '1661';

5、Japanese Cities' Attributes

Query all attributes of every Japanese city in the CITY table. The COUNTRYCODE for Japan is JPN.

select * from CITY where COUNTRYCODE = 'JPN';

6、Japanese Cities' Names

Query the names of all the Japanese cities in the CITY table. The COUNTRYCODE for Japan is JPN.

select name from CITY where COUNTRYCODE = 'JPN';