SQL查询的类型

-3

也许一个不平凡的查询数多行组，我用这台http://sqlfiddle.com/#!2/d0423，并试图输出用mysql 5.6SQL查询的类型

[type][type_cnt][f_cnt_type0][f_cnt_type1][f_cnt_type2][time_00][time_00-15][time_15-30] 
10  2   1    1   0   1   1   0 
20  3   1    1   1   1   2   0 
30  3   2    1   0   0   1   1

任何想法如下表？

来源

2013-03-17 luis

貌似简单'集团BY'像这样的列：'SUM（CASE WHEN ... THEN ... ELSE 0 END）'。在MySQL中，也可以使用'COUNT（布尔表达式）'。 – 2013-03-17 01:56:22

@Mitch小麦：不知道为什么这被标记下来。我做了米奇。我可以做几个查询类型，计数（'列'）和按类型分组，但不知道如何做其他人的一个语句或嵌套语句。如果您想提供帮助，非常感谢。 – luis 2013-03-17 02:46:22

@ PM 77-1：谢谢。这就是诀窍！ – luis 2013-03-17 03:58:24

CREATE TABLE bugs (
    type varchar(2), 
    flag varchar(1), 
    mins varchar(2) 
); 

INSERT INTO bugs(type, flag, mins) values 
('10','0','0'), 
('10','1','5'), 
('20','0','0'), 
('20','1','5'), 
('20','2','10'), 
('30','0','10'), 
('30','0','20'), 
('30','1','40'); 


select 
    type, 
    count(type) as type_cnt, 
    SUM(CASE WHEN flag='0' THEN 1 ELSE 0 END) as f_cnt_type0, 
    SUM(CASE WHEN flag='1' THEN 1 ELSE 0 END) as f_cnt_type1, 
    SUM(CASE WHEN flag='2' THEN 1 ELSE 0 END) as f_cnt_type2, 
    SUM(CASE WHEN CAST(mins AS UNSIGNED) = 0 THEN 1 ELSE 0 END) as time_00, 
    SUM(CASE WHEN CAST(mins AS UNSIGNED) > 0 and CAST(mins AS UNSIGNED) <= 15 THEN 1 ELSE 0 END) as time_00_15, 
    SUM(CASE WHEN CAST(mins AS UNSIGNED) > 15 and CAST(mins AS UNSIGNED) <= 30 THEN 1 ELSE 0 END) as time_15_30  
from bugs 
group by type

SQL：sqlfiddle

来源

2013-03-17 04:28:54 luis

SQL查询的类型

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