Retrieve the overall summary into another table, then join that with the original table: : Join Select « Join « SQL / MySQL






  1. SQL / MySQL
  2. Join
  3. Join Select

Retrieve the overall summary into another table, then join that with the original table:

    
mysql>
mysql> CREATE TABLE mytable
    -> (
    ->  rec_id          INT UNSIGNED NOT NULL AUTO_INCREMENT,
    ->  name            VARCHAR(20) NOT NULL,
    ->  trav_date       DATE NOT NULL,
    ->  miles           INT NOT NULL,
    ->  PRIMARY KEY (rec_id)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO mytable (name,trav_date,miles)
    ->  VALUES
    ->          ('Ben','2010-11-30',152),
    ->          ('Suzi','2010-11-29',391),
    ->          ('Henry','2010-11-29',300),
    ->          ('Henry','2010-11-27',96),
    ->          ('Ben','2010-11-29',131),
    ->          ('Henry','2010-11-26',115),
    ->          ('Suzi','2010-12-02',502),
    ->          ('Henry','2010-12-01',197),
    ->          ('Ben','2010-12-02',79),
    ->          ('Henry','2010-11-30',203)
    -> ;
Query OK, 10 rows affected (0.00 sec)
Records: 10  Duplicates: 0  Warnings: 0

mysql>
mysql> drop TEMPORARY TABLE t;
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> CREATE TEMPORARY TABLE t
    -> SELECT SUM(miles) AS total FROM mytable;
Query OK, 1 row affected (0.01 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql>
mysql> SELECT mytable.name,
    -> SUM(mytable.miles) AS 'miles/driver',
    -> (SUM(mytable.miles)*100)/t.total AS 'percent of total miles'
    -> FROM mytable, t GROUP BY mytable.name;
+-------+--------------+------------------------+
| name  | miles/driver | percent of total miles |
+-------+--------------+------------------------+
| Ben   |          362 |                16.7128 |
| Henry |          911 |                42.0591 |
| Suzi  |          893 |                41.2281 |
+-------+--------------+------------------------+
3 rows in set (0.00 sec)

mysql>
mysql> drop table mytable;
Query OK, 0 rows affected (0.00 sec)








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