24
25 key_len: 4
26
27 ref: const
28
29 rows: 2
30
31 Extra:
32
33 *************************** 2. row ***************************
34
35 id: 1
36
37 select_type: SIMPLE
38
39 table: m
40
41 type: ref
42
43 possible_keys: PRIMARY,idx_group_message_gid_uid
44
45 key: idx_group_message_gid_uid
46
47 key_len: 4
延伸阅读
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