SQL getting started plan-1-select

So let's start here , Will learn how to master Leetcode Medium SQL subject , There are two versions of each topic, the original and the variant , Consolidate learning , Improve my ability in practice .

1 choice

The original version :

therefore , The answer to this question should be as follows :
First step :
New database

The second step ,
Create data table :

CREATE TABLE world(
   name   INT NOT NULL AUTO_INCREMENT,
   continent  VARCHAR(100) ,
   area INT NOT NULL ,
   population INT NOT NULL ,
   gdp INT NOT NULL ,
   PRIMARY KEY (name)
   )ENGINE=InnoDB DEFAULT CHARSET=utf8;

ad locum ,SQL Middle primary key name The value type of is inconsistent with the real value type .

Insert relevant data

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (1, "a", 3000000,25000000,10);

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (2, "a", 1000000,15000000,10);

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (3, "a", 4000000,45000000,10);

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (4, "a", 5000000,65000000,10);

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (5, "a", 1000000,5000000,10);

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (6, "a", 1000000,25000000,10);

INSERT INTO world
     (name, continent, area, population, gdp)
     VALUES
     (7, "a", 13000000,14000000,10);

Write a query SQL The sentence of , Get feedback .

Query results

This question is suitable for , Query two fields larger than / Less than / A table equal to a certain value .

For example, I can create a table , Query the situation that a value in the table is too large .