回答編集履歴
3
ついき
answer
CHANGED
|
@@ -57,4 +57,42 @@
|
|
|
57
57
|
実際にはいくつあるかは状況によって違うでしょう
|
|
58
58
|
原則としてgroup_concatの部分は手書きでしかSQLは指定できないので、
|
|
59
59
|
これをループさせて羅列する処理をprocedureで書くわけです
|
|
60
|
-
興味があるようならprocedureの書き方も例示します
|
|
60
|
+
興味があるようならprocedureの書き方も例示します
|
|
61
|
+
|
|
62
|
+
# procedure
|
|
63
|
+
横方向への羅列するprocedure
|
|
64
|
+
|
|
65
|
+
```SQL
|
|
66
|
+
drop procedure if exists proc_yoko_hyoji;
|
|
67
|
+
delimiter //
|
|
68
|
+
create procedure proc_yoko_hyoji()
|
|
69
|
+
begin
|
|
70
|
+
declare cnt int;
|
|
71
|
+
declare len int;
|
|
72
|
+
select count(*) into len from tbl group by mid order by len desc limit 1;
|
|
73
|
+
set @sql="select mid";
|
|
74
|
+
set cnt=1;
|
|
75
|
+
while cnt<=len DO
|
|
76
|
+
set @sql=concat(@sql
|
|
77
|
+
,",group_concat(case rank when ",cnt," then sid end) as sid",cnt
|
|
78
|
+
,",group_concat(case rank when ",cnt," then snote end) as snote",cnt
|
|
79
|
+
);
|
|
80
|
+
set cnt=cnt+1;
|
|
81
|
+
end while;
|
|
82
|
+
set @sql=concat(@sql
|
|
83
|
+
," from ( "
|
|
84
|
+
,"select mid,sid,snote,(select count(*)+1 from tbl as t2 where t1.mid=t2.mid and t1.sid>t2.sid) as rank "
|
|
85
|
+
,"from tbl as t1 "
|
|
86
|
+
,") as sub "
|
|
87
|
+
,"group by mid "
|
|
88
|
+
);
|
|
89
|
+
prepare stmt from @sql;
|
|
90
|
+
execute stmt;
|
|
91
|
+
end
|
|
92
|
+
//
|
|
93
|
+
delimiter ;
|
|
94
|
+
```
|
|
95
|
+
※上記を一度つくっておけばあとは、データ更新などがあっても以下を実行するだけです
|
|
96
|
+
```SQL
|
|
97
|
+
call proc_yoko_hyoji;
|
|
98
|
+
```
|
2
調整
answer
CHANGED
|
@@ -37,19 +37,20 @@
|
|
|
37
37
|
- 検索
|
|
38
38
|
```SQL
|
|
39
39
|
select mid
|
|
40
|
-
,group_concat(case when
|
|
40
|
+
,group_concat(case rank when 1 then sid end) as sid1
|
|
41
|
-
,group_concat(case when
|
|
41
|
+
,group_concat(case rank when 1 then snote end) as snote1
|
|
42
|
-
,group_concat(case when
|
|
42
|
+
,group_concat(case rank when 2 then sid end) as sid2
|
|
43
|
-
,group_concat(case when
|
|
43
|
+
,group_concat(case rank when 2 then snote end) as snote2
|
|
44
|
-
,group_concat(case when
|
|
44
|
+
,group_concat(case rank when 3 then sid end) as sid3
|
|
45
|
-
,group_concat(case when
|
|
45
|
+
,group_concat(case rank when 3 then snote end) as snote3
|
|
46
|
-
,group_concat(case when
|
|
46
|
+
,group_concat(case rank when 4 then sid end) as sid4
|
|
47
|
-
,group_concat(case when
|
|
47
|
+
,group_concat(case rank when 4 then snote end) as snote4
|
|
48
48
|
from(
|
|
49
49
|
select mid,sid,snote,(select count(*)+1 from tbl as t2 where t1.mid=t2.mid and t1.sid>t2.sid) as rank
|
|
50
50
|
from tbl t1
|
|
51
51
|
) as b
|
|
52
52
|
group by mid
|
|
53
|
+
|
|
53
54
|
```
|
|
54
55
|
|
|
55
56
|
上記元データはmid=1のデータが4つあると目視できるため4列書いていますが
|
1
sample
answer
CHANGED
|
@@ -12,4 +12,48 @@
|
|
|
12
12
|
$rows[$row["MAIN_ID"]][]=[$row["SUB_ID","SUB_NOTE"]];
|
|
13
13
|
}
|
|
14
14
|
```
|
|
15
|
-
のようなとり方をするとかで対応してみてください
|
|
15
|
+
のようなとり方をするとかで対応してみてください
|
|
16
|
+
|
|
17
|
+
# sample
|
|
18
|
+
SQLでやる簡単なサンプルを付けておきます
|
|
19
|
+
|
|
20
|
+
- 元データ
|
|
21
|
+
|
|
22
|
+
```SQL
|
|
23
|
+
create table tbl(mid int,sid int unique,snote varchar(20));
|
|
24
|
+
insert into tbl values
|
|
25
|
+
(1,1,'a'),
|
|
26
|
+
(1,2,'b'),
|
|
27
|
+
(1,3,'c'),
|
|
28
|
+
(1,4,'d'),
|
|
29
|
+
(2,5,'e'),
|
|
30
|
+
(2,6,'f'),
|
|
31
|
+
(2,7,'g'),
|
|
32
|
+
(3,8,'h'),
|
|
33
|
+
(4,9,'i'),
|
|
34
|
+
(4,10,'k');
|
|
35
|
+
```
|
|
36
|
+
|
|
37
|
+
- 検索
|
|
38
|
+
```SQL
|
|
39
|
+
select mid
|
|
40
|
+
,group_concat(case when rank=1 then sid end) as sid1
|
|
41
|
+
,group_concat(case when rank=1 then snote end) as snote1
|
|
42
|
+
,group_concat(case when rank=2 then sid end) as sid2
|
|
43
|
+
,group_concat(case when rank=2 then snote end) as snote2
|
|
44
|
+
,group_concat(case when rank=3 then sid end) as sid3
|
|
45
|
+
,group_concat(case when rank=3 then snote end) as snote3
|
|
46
|
+
,group_concat(case when rank=4 then sid end) as sid4
|
|
47
|
+
,group_concat(case when rank=4 then snote end) as snote4
|
|
48
|
+
from(
|
|
49
|
+
select mid,sid,snote,(select count(*)+1 from tbl as t2 where t1.mid=t2.mid and t1.sid>t2.sid) as rank
|
|
50
|
+
from tbl t1
|
|
51
|
+
) as b
|
|
52
|
+
group by mid
|
|
53
|
+
```
|
|
54
|
+
|
|
55
|
+
上記元データはmid=1のデータが4つあると目視できるため4列書いていますが
|
|
56
|
+
実際にはいくつあるかは状況によって違うでしょう
|
|
57
|
+
原則としてgroup_concatの部分は手書きでしかSQLは指定できないので、
|
|
58
|
+
これをループさせて羅列する処理をprocedureで書くわけです
|
|
59
|
+
興味があるようならprocedureの書き方も例示します
|