//to create a table
CREATE TABLE students
( student_id number(4) primary key,
last_name varchar2(30) NOT NULL,
course_id number(4) NULL );
//to insert value
INSERT INTO students VALUES (200, 'Jones', 101);
INSERT INTO students VALUES (201, 'Smith', 101);
INSERT INTO students VALUE (202, 'Lee' , 102);
#create a table and name it
CREATE TABLE test_name(
#create some vars in the table like id, name, age and etc.
id INT NOT NULL,
name VARCHAR,
age FLOAT NOT NULL
PRIMARY KEY(id) #define the primary key of the table(primary key is a var that will never be the same in each column in the table it will be "unique" rise up for each column
);