PHP MySQL Select

The SELECT statement is used to select data from a database. The next example performs the following tasks according to the selected option:
Drop
Drop the tables Enrollments and Courses if requested.

Create and Populate
Create and populate the tables Enrollments and Courses if requested. The SQL commands are given below: 

CREATE TABLE Courses (
  number CHAR(10) PRIMARY KEY,
  name   VARCHAR(16) ) ENGINE=InnoDB;

INSERT INTO Courses VALUES ( '457', 'E-Commerce' ), ( '351', 'File Processing' );

CREATE TABLE Enrollments (
  name    VARCHAR(32),
  course  CHAR(10),
  PRIMARY KEY( name, course ),
  FOREIGN KEY( course ) REFERENCES Courses( number ) ) ENGINE=InnoDB;

INSERT INTO Enrollments VALUES ( 'Bart', '351' ), ( 'Bart, '457' );
INSERT INTO Enrollments
  SELECT 'Ben', number FROM Courses WHERE  name = 'E-Commerce';

Select
Perform the following tasks:
  1. Use query function to execute the SQL SELECT command: 
     SELECT  E.name student, C.name course  FROM   Enrollments E, Courses C 
   WHERE  E.course LIKE '%$course%' AND E.course = C.number;
  2. Store the data returned by the query function in the $result variable.
  3. Use the fetch_assoc function to return the first row from the recordset as an array.
  4. Each subsequent call to fetch_assoc returns the next row in the recordset.
  5. The while loop loops through all the records in the recordset. To print the value of each row, we use the PHP $row variable ($row['student'] and $row['course']).