48
49 ref: example.g.group_id
50
51 rows: 3
52
53 Extra:
54
55 *************************** 3. row ***************************
56
57 id: 1
58
59 select_type: SIMPLE
60
61 table: c
62
63 type: ref
64
65 possible_keys: idx_group_message_content_msg_id
66
67 key: idx_group_message_content_msg_id
68
69 key_len: 4
70
71 ref: example.m.id
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