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我有这张表。我的任务是这样的:统计具有相同名字的学生。MySql计数相同的值
我想让它显示我只是姓,然后名字是多少次发现:
这样的:bob | 2
id firstN lastN group grade tax gender year university
9 Alyson Hanniga 112 1 0 female 1 UTC
5 Barney Stinson 111 4 0 male 1 UBB
8 Bob Saget 111 6 900 male 3 UBB
14 Bob Bob 112 10 250 male 1 UBB
11 Cobie Smulder 111 9 200 female 1 Dragos Voda
7 David Henrie 112 9 0 male 1 Dragos Voda
12 Jason Segel 112 10 150 male 1 UTC
13 Josh Radnor 112 7 0 male 2 Dragos Voda
4 Lily Aldrin 112 5 400 female 1 UBB
6 Lyndsy Fonseca 113 10 0 female 3 UTC
2 Marshal Eriksen 112 10 100 male 2 UTC
10 Neil Patrick 112 7 0 male 3 Dragos Voda
1 Robin Scherba 111 10 0 female 1 UBB
3 Ted Mosby 112 8 0 male 2 UBB
PFF查询。这很愚蠢。我怎样才能编辑这个和复制/粘贴一张桌子..它不会让我发布图像:( – user3222552
要做到这一点,你需要在这个网站上获得一些声誉。 /meta.stackexchange.com/questions/7931/faq-for-stack-exchange-sites) –
从学生组中选择firstName,count(*)by firstName having count(*)> 1; – user3222552