回答編集履歴
1
追記
test
CHANGED
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@@ -1,3 +1,41 @@
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1
1
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sampleを提示してもらわないとちょっとイメージがつかないのですが
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2
2
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3
3
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countの際distinctするとよいような気がします。
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4
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+
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5
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+
# 追記
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6
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+
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7
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一応こういうことなんですけどね
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8
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+
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9
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```SQL
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10
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+
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11
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+
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12
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+
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13
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create table tbl(id int primary key,uid int,data int);
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14
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+
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15
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insert into tbl values
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16
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+
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17
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(1,1,10),
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18
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19
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(2,1,10),
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20
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21
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(3,1,10),
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22
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23
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(4,1,20),
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24
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25
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(5,1,20),
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26
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27
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(6,1,30),
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28
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29
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(7,2,10),
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30
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31
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(8,2,20),
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32
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33
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(9,2,20),
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34
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35
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(10,3,10);
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36
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37
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38
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39
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select uid,count(data) as c1,count(distinct data) as c2 from tbl group by uid
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40
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+
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41
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```
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