回答編集履歴
1
tuiki
test
CHANGED
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@@ -73,3 +73,73 @@
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73
73
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group by user
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74
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75
75
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````
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76
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77
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78
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79
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# 蛇足
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80
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81
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これをmysqlでやるときprocedureでこう作っておきます
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82
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83
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```SQL
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84
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85
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drop procedure if exists shukei;
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86
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delimiter //
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create procedure shukei(IN start_year int,IN end_year int)
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90
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begin
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declare year int default 0;
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set year=start_year;
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set @sql='select user';
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while year<=end_year do
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set @sql=concat(@sql,',sum((year=',year,')*val) as x',year);
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set year=year+1;
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end while;
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set @sql=concat(@sql,' from tbl group by user');
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108
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prepare stmt from @sql;
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execute stmt;
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end
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115
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//
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delimiter ;
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118
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```
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集計の呼び出し
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```SQL
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call shukei(2000,2003);
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```
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結果：
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136
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137
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|user|x2000|x2001|x2002|x2003|
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138
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|:--:|--:|--:|--:|--:|
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|AAA|3|7|65|56|
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142
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143
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|BBB|54|4|42|4|
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144
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145
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|CCC|5|86|31|21
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