(1)索引唯一扫描(index unique scan)
(2)索引范围扫描(index range scan)
(3)索引全扫描(index full scan)
(4)索引快速扫描(index fast full scan)
(5)索引跳跃扫描(index skip scan)
(1)索引唯一扫描(index unique scan)
(2)索引范围扫描(index range scan)
(3)索引全扫描(index full scan)
(4)索引快速扫描(index fast full scan)
(5)索引跳跃扫描(index skip scan)