COUNT command with condition : Count « Select Clause « SQL / MySQL






  1. SQL / MySQL
  2. Select Clause
  3. Count

COUNT command with condition

/*
mysql>  SELECT species, sex, COUNT(*) FROM Bird
    ->         WHERE species = 'dog' OR species = 'cat'
    ->         GROUP BY species, sex;
Empty set (0.00 sec)


*/  
Drop table Bird;

CREATE TABLE Bird (
    name VARCHAR(20), 
    owner VARCHAR(20),
    species VARCHAR(20), 
    sex CHAR(1), 
    birth DATE, 
    death DATE
);
  
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 ('RedBird','Yin','Bus','m','1998-01-30',NULL);

/* You need not retrieve an entire table when you use COUNT(). 
For example, the previous query, when performed just on dogs and 
cats, looks like this:
*/
 SELECT species, sex, COUNT(*) FROM Bird
        WHERE species = 'dog' OR species = 'cat'
        GROUP BY species, sex;








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