回答編集履歴
2
調整
test
CHANGED
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@@ -52,3 +52,18 @@
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|
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52
52
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group by c1,c2,c3,c4,c5
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53
53
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having count(*)=1
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54
54
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```
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55
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+
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56
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+
# 別解釈
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57
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+
こういうことかも
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58
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+
```SQL
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59
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+
select sum(c6) as sum_c6 from tbl as t1
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60
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+
where not exists(
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61
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+
select 1 from tbl where 1
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62
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+
and id<>t1.id
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63
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+
and c1=t1.c1
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64
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+
and c2=t1.c2
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65
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+
and c3=t1.c3
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66
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+
and c4=t1.c4
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67
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+
and c5=t1.c5
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68
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+
)
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69
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+
```
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1
調整
test
CHANGED
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@@ -1 +1,54 @@
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1
1
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C1～C6をひとまとめにした複合インデックスを貼ってください
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2
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+
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3
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+
# 参考
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4
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+
```SQL
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5
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+
create table tbl(id int primary key,
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6
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+
c1 varchar(10) not null,
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7
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+
c2 varchar(10) not null,
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8
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+
c3 varchar(10) not null,
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9
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+
c4 varchar(10) not null,
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10
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+
c5 varchar(10) not null,
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11
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+
c6 int not null,
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12
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+
index (c1,c2,c3,c4,c5,c6));
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13
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+
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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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+
( 1,'a1','b1','c1','d1','e1',1),
|
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17
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+
( 2,'a1','b1','c1','d1','e1',2),
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18
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+
( 3,'a1','b1','c2','d2','e2',3),
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19
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+
( 4,'a1','b2','c2','d2','e2',4),
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20
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+
( 5,'a1','b2','c2','d2','e2',5),
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21
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+
( 6,'a2','b2','c2','d2','e2',6),
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22
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+
( 7,'a2','b3','c2','d2','e2',7),
|
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23
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+
( 8,'a2','b3','c2','d2','e2',8),
|
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24
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+
( 9,'a3','b4','c2','d2','e2',9),
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25
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+
(10,'a3','b4','c2','d2','e2',0);
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26
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+
```
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27
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+
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28
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+
集計
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29
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+
```SQL
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30
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+
select
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31
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+
c1,c2,c3,c4,c5
|
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32
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+
,count(*) as cnt
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33
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+
,sum(c6) as sum_c6
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34
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+
from tbl
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|
35
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+
group by c1,c2,c3,c4,c5
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|
36
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+
```
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37
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+
重複データを除外
|
|
38
|
+
```SQL
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|
39
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+
select
|
|
40
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+
c1,c2,c3,c4,c5
|
|
41
|
+
,sum(c6) as sum_c6
|
|
42
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+
from tbl
|
|
43
|
+
group by c1,c2,c3,c4,c5
|
|
44
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+
having count(*)=1
|
|
45
|
+
```
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46
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+
インデックスチェック
|
|
47
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+
```SQL
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|
48
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+
explain select
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|
49
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+
c1,c2,c3,c4,c5
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50
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+
,sum(c6) as sum_c6
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51
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+
from tbl
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52
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+
group by c1,c2,c3,c4,c5
|
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53
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+
having count(*)=1
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|
54
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+
```
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