<分区>
我的数据库中有一个表
+------+------+----------+ | id | dept | location | +------+------+----------+ | 1 | eee | chennai | | 2 | ece | chennai | | 3 | eee | chennai | | 4 | ece | chennai | | 5 | eee | cbe | | 6 | ece | trichy | | 7 | mech | madurai | +------+------+----------+
我需要在转置其中一列时对 id 进行计数。谁能建议我查询以获得以下结果
+---------+------+-----+------+ | location| eee | ece | mech | +---------+------+-----+------+ | chennai | 2 | 2 | 0 | | cbe | 1 | 0 | 0 | | trichy | 0 | 1 | 0 | | madurai | 0 | 0 | 1 | +---------+------+-----+------+
谢谢你的帮助