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cexposit / IB-databases

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IB databases:

Create table with primary key:

SQL Script

CREATE TABLE students ( 
  id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, 
  firstname VARCHAR(30) NOT NULL, 
  lastname VARCHAR(30) NOT NULL,  
  email VARCHAR(50),
  birthDate DATE NOT NULL,
  reg_date TIMESTAMP 
); 

INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('lucas', 'izquierdo', 'lucas.izquierdo@gmail.com', '2008-11-11', CURRENT_TIMESTAMP); 
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('andrea', 'arencibia', 'andrea.arencibia@hotmail.com', '2004-03-06', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('lucia', 'chinea', 'lucia.chinea@gmail.com', '2005-04-07', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('diego', 'moreno', 'diego.moreno@gmail.com', '2006-02-01', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('julia', 'lorenzo', 'julia.lorenzo@gmail.com', '2001-03-05', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('nuria', 'sosa', 'nuria.castro@gmail.com', '2002-08-04', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('nerea', 'flores', 'nerea.flores@gmail.com', '2003-06-07', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('airam', 'aguirre', 'airam.aguirre@gmail.com', '2004-03-06', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('israel', 'rojas', 'israel-rojas@gmail.com', '2008-02-01', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `reg_date`) VALUES ('jacob', 'castro', 'jacob.castro@gmail.com', '2005-01-02', CURRENT_TIMESTAMP);

SQL Query

  1. SELECT * FROM students;
  2. SELECT firstname, lastname FROM students;
  3. SELECT * FROM students WHERE birthDate = '2008-11-11'
  4. SELECT * FROM students WHERE birthDate >= '2005'
  5. SELECT * FROM students ORDER BY birthDate DESC
  6. SELECT MIN(birthDate), firstname, lastname FROM students
  7. SELECT COUNT(id), year(birthDate) FROM students GROUP BY year(birthDate)

Create two tables with foreign key:

SQL Script

CREATE TABLE institutions (
  name VARCHAR(50) NOT NULL,
  foundation YEAR NOT NULL,
  PRIMARY KEY (name)
);

CREATE TABLE students ( 
  id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, 
  firstname VARCHAR(30) NOT NULL, 
  lastname VARCHAR(30) NOT NULL,  
  email VARCHAR(50),
  birthDate DATE NOT NULL,
  affiliation VARCHAR(50),  
  reg_date TIMESTAMP, 
  FOREIGN KEY (affiliation) REFERENCES institutions(name)
);

INSERT INTO `institutions` (`name`, `foundation`) VALUES ('ull', 1927); 
INSERT INTO `institutions` (`name`, `foundation`) VALUES ('ulpgc', 1989); 

INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('lucas', 'izquierdo', 'lucas.izquierdo@gmail.com', '2008-11-11', 'ull', CURRENT_TIMESTAMP); 
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('andrea', 'arencibia', 'andrea.arencibia@hotmail.com', '2004-03-06', 'ull', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('lucia', 'chinea', 'lucia.chinea@gmail.com', '2005-04-07', 'ull', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('diego', 'moreno', 'diego.moreno@gmail.com', '2006-02-01', 'ull', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('julia', 'lorenzo', 'julia.lorenzo@gmail.com', '2001-03-05', 'ull', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('nuria', 'sosa', 'nuria.castro@gmail.com', '2002-08-04', 'ulpgc', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('nerea', 'flores', 'nerea.flores@gmail.com', '2003-06-07', 'ulpgc', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('airam', 'aguirre', 'airam.aguirre@gmail.com', '2004-03-06', 'ulpgc', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('israel', 'rojas', 'israel-rojas@gmail.com', '2008-02-01', 'ulpgc', CURRENT_TIMESTAMP);
INSERT INTO `students` (`firstname`, `lastname`, `email`, `birthDate`, `affiliation`, `reg_date`) VALUES ('jacob', 'castro', 'jacob.castro@gmail.com', '2005-01-02', 'ulpgc', CURRENT_TIMESTAMP);

SQL Query

  1. SELECT * FROM institutions;
  2. SELECT * FROM students;
  3. SELECT students.firstname, institutions.name, institutions.foundation FROM students, institutions WHERE students.affiliation=institutions.name

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