This is a way to do:
select shipmentID,
sum(IF (category='shoes', quantity, 0)) AS shoes,
sum(IF (category='hats', quantity, 0)) AS hats,
sum(IF (category='shirts', quantity, 0)) AS shirts,
sum(IF (category='toys', quantity, 0)) AS toys,
sum(IF (category='books', quantity, 0)) AS books,
from
(select 1 as shipmentID, 'shoes' as category, 5 as quantity),
(select 1 as shipmentID, 'hats' as category, 3 as quantity),
(select 2 as shipmentID, 'shirts' as category, 1 as quantity),
(select 2 as shipmentID, 'hats' as category, 2 as quantity),
(select 3 as shipmentID, 'toys' as category, 3 as quantity),
(select 2 as shipmentID, 'books' as category, 1 as quantity),
(select 3 as shipmentID, 'shirts' as category, 1 as quantity),
group by shipmentID
This returns:
+-----+------------+-------+------+--------+------+-------+---+
| Row | shipmentID | shoes | hats | shirts | toys | books | |
+-----+------------+-------+------+--------+------+-------+---+
| 1 | 1 | 5 | 3 | 0 | 0 | 0 | |
| 2 | 2 | 0 | 2 | 1 | 0 | 1 | |
| 3 | 3 | 0 | 0 | 1 | 3 | 0 | |
+-----+------------+-------+------+--------+------+-------+---+
See the manual for other pivot table example.
