Mega Code Archive
To know the percentage distribution
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mysql>
mysql>
mysql>
mysql> CREATE TABLE mytable (
-> id int(11) NOT NULL default '0',
-> choice tinyint(4) NOT NULL default '0',
-> ts timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
-> PRIMARY KEY (id)
-> );
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql> INSERT INTO mytable VALUES (1,4,'2003-01-14 15:46:18'),
-> (2,1,'2003-01-14 15:49:44'),
-> (3,4,'2003-01-14 15:49:50'),
-> (4,4,'2003-01-14 15:49:53'),
-> (5,4,'2003-01-14 15:49:54'),
-> (6,2,'2003-01-14 15:49:58');
Query OK, 6 rows affected (0.00 sec)
Records: 6 Duplicates: 0 Warnings: 0
mysql>
mysql>
mysql>
mysql> SELECT DATE_FORMAT(ts, '%Y-%m') AS mnth,
-> ROUND(SUM(IF(choice=1, 1, 0)) * 100 / COUNT(*), 1) AS c,
-> ROUND(SUM(IF(choice=2, 1, 0)) * 100 / COUNT(*), 1) AS java,
-> ROUND(SUM(IF(choice=3, 1, 0)) * 100 / COUNT(*), 1) AS perl,
-> ROUND(SUM(IF(choice=4, 1, 0)) * 100 / COUNT(*), 1) AS php,
-> ROUND(SUM(IF(choice=5, 1, 0)) * 100 / COUNT(*), 1) AS vb,
-> ROUND(SUM(IF(choice=6, 1, 0)) * 100 / COUNT(*), 1) AS other
-> FROM mytable
-> GROUP BY mnth;
+---------+------+------+------+------+------+-------+
| mnth | c | java | perl | php | vb | other |
+---------+------+------+------+------+------+-------+
| 2003-01 | 16.7 | 16.7 | 0.0 | 66.7 | 0.0 | 0.0 |
+---------+------+------+------+------+------+-------+
1 row in set (0.00 sec)
mysql>
mysql> drop table mytable;
Query OK, 0 rows affected (0.00 sec)
mysql>
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