Using More Than one Table : Simple JOIN « Join « SQL / MySQL






  1. SQL / MySQL
  2. Join
  3. Simple JOIN

Using More Than one Table

  
/*

mysql> SELECT bird.name,
    ->        (YEAR(date)-YEAR(birth)) - (RIGHT(date,5)<RIGHT(birth,5)) AS age,
    ->        remark
    ->        FROM bird, event
    ->        WHERE bird.name = event.name AND event.type = 'sell';
+---------+------+----------------+
| name    | age  | remark         |
+---------+------+----------------+
| RedBird |   16 | sell just sell |
+---------+------+----------------+
1 row in set (0.00 sec)


*/

/* Create table */
Drop table event;
Drop table Bird;

CREATE TABLE Bird (
    name VARCHAR(20), 
    owner VARCHAR(20),
    species VARCHAR(20), 
    sex CHAR(1), 
    birth DATE, 
    death DATE
);
  

  
CREATE TABLE event (
    name VARCHAR(20), 
    date DATE,
    type VARCHAR(15), 
    remark VARCHAR(255)
);

INSERT INTO  Bird VALUES ('BlueBird','Joe','Car','f','1999-03-30',NULL);
INSERT INTO  Bird VALUES ('RedBird','Yin','Bus','m','1979-04-30',1998-01-30);
INSERT INTO  Bird VALUES ('RedBird1','Yin','Bus','m','1998-01-30',NULL);

insert into event values ('BlueBird','1995-05-15','buy','Buy just Buy');
insert into event values ('RedBird','1995-05-15','sell','sell just sell');
insert into event values ('RedBird2','1995-05-15','sell','sell and buy');


SELECT bird.name,
       (YEAR(date)-YEAR(birth)) - (RIGHT(date,5)<RIGHT(birth,5)) AS age,
       remark
       FROM bird, event
       WHERE bird.name = event.name AND event.type = 'sell';








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