Count and group by two columns : Count « Select Clause « SQL / MySQL

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SQL / MySQL » Select Clause » Count 




Count and group by two columns

/*

mysql> /* Number of animals per combination of species and sex: */
mysql> SELECT species, sex, COUNT(*FROM Bird GROUP BY species, sex;
+---------+------+----------+
| species | sex  | COUNT(*|
+---------+------+----------+
| Bus     | m    |        |
| Car     | f    |        |
+---------+------+----------+
rows in set (0.02 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);


/* Number of animals per combination of species and sex: */

SELECT species, sex, COUNT(*FROM Bird GROUP BY species, sex;


           
       














Related examples in the same category
1.Counting Rows: Counting the total number of animals
2.Count and group
3.Use COUNT in select command
4.COUNT() and GROUP BY
5.Another Count and Group BY
6.COUNT command with condition
7.COUNT with condition and group
8.Get GROUP BY for COUNT
9.Use COUNT with condition
10.Simple COUNT
11.Performing Row and Column Counting
12.Use COUNT and GROUP
13.Use COUNT, GROUP and HAVING
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