回答編集履歴
3
procedure
answer
CHANGED
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@@ -29,4 +29,44 @@
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29
29
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group by t1.uid
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30
30
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31
31
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```
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32
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-
プロシージャとピボットとか使うともうちょい自動化してそれっぽく見えるかも
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32
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+
プロシージャとピボットとか使うともうちょい自動化してそれっぽく見えるかも
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33
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+
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34
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+
# procudure
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35
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- 以下、実行しプロシージャをつくっておきます。
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36
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```SQL
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37
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drop procedure if exists my_proc;
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38
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delimiter //
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39
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create procedure my_proc()
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40
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begin
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41
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declare a int;
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42
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declare b varchar(100);
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43
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declare done int default 0;
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44
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declare cur cursor for
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45
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select eid,ename from event order by eid;
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46
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declare continue handler for sqlstate '02000' set done=1;
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47
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+
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48
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set @sql='select t1.uid,t1.uname\n';
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49
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open cur;
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50
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repeat
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51
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fetch cur into a,b;
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52
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if not done then
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53
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set @sql=concat (@sql,',sum(t2.eid=',a,' * t2.shukketu=1) as `',b,' shukketu`\n');
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54
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set @sql=concat (@sql,',sum(t2.eid=',a,' * t2.nyukin=1) as `',b,' nyukin`\n');
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55
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end if;
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56
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until done end repeat;
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57
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close cur;
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58
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set @sql=concat (@sql,' from user as t1\n');
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59
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set @sql=concat (@sql,' left join event_user as t2 on t1.uid=t2.uid\n');
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60
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set @sql=concat (@sql,' group by t1.uid\n');
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61
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prepare stmt from @sql;
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62
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execute stmt;
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63
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end
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64
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//
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65
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delimiter ;
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66
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67
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```
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68
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- 実行
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69
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```SQL
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70
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call my_proc;
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71
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+
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72
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```
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2
調整
answer
CHANGED
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@@ -29,5 +29,4 @@
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29
29
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group by t1.uid
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30
30
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31
31
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```
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32
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-
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33
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-
ピボットとか使うともうちょいそれっぽく見えるかも
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32
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+
プロシージャとピボットとか使うともうちょい自動化してそれっぽく見えるかも
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1
追記
answer
CHANGED
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@@ -3,4 +3,31 @@
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3
3
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あればよいような気がします。
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4
4
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5
5
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create tableとinsert into形式で例示いただければ
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6
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-
SQL文は知恵を絞れると思います。
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6
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+
SQL文は知恵を絞れると思います。
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7
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+
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8
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# sample
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9
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- 元データ
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10
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```SQL
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11
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create table event (eid int unique,ename varchar(30));
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12
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insert into event values(1,'child event 1'),(2,'child event 2'),(3,'child event 3');
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13
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create table user (uid int unique,uname varchar(30));
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14
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insert into user values(1,'tanaka'),(2,'yoshida'),(3,'suzuki'),(4,'sato'),(5,'honda');
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15
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create table event_user(eid int,uid int ,shukketu tinyint not null,nyukin tinyint not null,unique(eid,uid));
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16
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insert into event_user values(1,1,1,1),(1,2,0,0),(1,3,1,0),(2,1,0,1),(3,4,1,0);
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17
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```
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18
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- 検索
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19
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```SQL
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20
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select t1.uid,t1.uname
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21
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,sum(t2.eid=1 * t2.shukketu=1) as e1s
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22
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,sum(t2.eid=1 * t2.nyukin=1) as e1n
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23
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,sum(t2.eid=2 * t2.shukketu=1) as e2s
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24
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,sum(t2.eid=2 * t2.nyukin=1) as e2n
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25
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,sum(t2.eid=3 * t2.shukketu=1) as e3s
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26
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,sum(t2.eid=3 * t2.nyukin=1) as e3n
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27
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from user as t1
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28
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left join event_user as t2 on t1.uid=t2.uid
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29
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group by t1.uid
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30
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+
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31
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```
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32
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+
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33
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+
ピボットとか使うともうちょいそれっぽく見えるかも
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