Another Count and Group BY : Count « Select Clause « SQL / MySQL






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

Another Count and Group BY

/*

mysql> /* Number of animals per sex: */
mysql> SELECT sex, COUNT(*) FROM Bird GROUP BY sex;
+------+----------+
| sex  | COUNT(*) |
+------+----------+
| f    |        1 |
| m    |        2 |
+------+----------+
2 rows in 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);

/* Number of animals per sex: */

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








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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