Question

由于没有Pivots或Cubes，我在MYSQL中一直绞尽脑汁。我尝试使用Case When它部分有效，但是我似乎无法过滤它只有会员=是，尽管子查询工作过滤掉了＆＃39; No＆＃39;

CREATE TABLE `nvp` (
`rowid` int(11) NOT NULL AUTO_INCREMENT,
`groupid` varchar(45) DEFAULT NULL,
`name` varchar(45) DEFAULT NULL,
`value` varchar(45) DEFAULT NULL,
`created` date DEFAULT NULL,
PRIMARY KEY (`rowid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;


INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('1', 'Fee', '10', '2014-03-01');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('1', 'Member', 'Yes', '2014-03-01');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('1', 'Type', 'MLB', '2014-03-01');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('2', 'Fee', '10', '2014-03-01');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('2', 'Member', 'Yes', '2014-03-01');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('2', 'Type', 'MLB', '2014-03-01');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('3', 'Fee', '10', '2014-03-02');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('3', 'Member', 'Yes', '2014-03-02');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('3', 'Type', 'MLB', '2014-03-02');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('4', 'Fee', '20', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('4', 'Member', 'Yes', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('4', 'Type', 'NFL', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('5', 'Fee', '50', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('5', 'Member', 'Yes', '2014-03-03');   
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('5', 'Type', 'NBA', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('6', 'Fee', '50', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('6', 'Member', 'Yes', '2014-03-03');    
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('6', 'Type', 'NBA', '2014-03-03');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('7', 'Fee', '100', '2014-03-04');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('7', 'Member', 'No', '2014-03-04');  
INSERT INTO `t2`.`nvp` (`groupid`, `name`, `value`, `created`) VALUES ('7', 'Type', 'NBA', '2014-03-04');

所需的输出＆＃34; Pivot＆＃34;表格，过滤仅显示会员以及按日期分组的每笔费用的总和。

Date,      MLB,  NFL, NBA
2014-03-01, 20,   0,   0
2014-03-02, 10,   0,   0
3014-03-03, 0,    20,  50

任何人都有一些指示？谢谢。

这是SQL尝试过：

select tbl2.created,
    sum(case when tbl2.type='MLB' then fee else null end) as MLB,
    sum(case when tbl2.type='NBA' then fee else null end) as NBA,
    sum(case when tbl2.type='NFL' then fee else null end) as NFL
from (select  tbl.* from (select
    created,
    sum(case when nvp.name='Fee' then value else null end) as  Fee,
    max(case when nvp.name='Type' then value else null end) as  Type,
    max(case when nvp.name='Member'  then value else null end) as  member
from nvp group by groupid) AS tbl where member='Yes') as tbl2 group by created;

# query to transpose row/columns, uses max where strings are required, this does filter out the No.
(select  tbl.* from (select
    created,
    sum(case when nvp.name='Fee' then value else null end) as  Fee,
    max(case when nvp.name='Type' then value else null end) as  Type,
    max(case when nvp.name='Member'  then value else null end) as  member
from nvp group by groupid) AS tbl where member='Yes');

Answer 1

这是执行总摘要的基本查询：

select t.created,
       sum(case when t.type = 'MLB' then fee else null end) as MLB,
       sum(case when t.type = 'NBA' then fee else null end) as NBA,
       sum(case when t.type = 'NFL' then fee else null end) as NFL
from (select created,
             sum(case when nvp.name = 'Fee' then value+0 else null end) as  Fee,
             max(case when nvp.name = 'Type' then value else null end) as  Type,
             max(case when nvp.name = 'Member' then value else null end) as  member
      from nvp
      group by groupid
     ) t
group by created;

添加where member = 'Yes'应该有效：

select t.created,
       sum(case when t.type = 'MLB' then fee else null end) as MLB,
       sum(case when t.type = 'NBA' then fee else null end) as NBA,
       sum(case when t.type = 'NFL' then fee else null end) as NFL
from (select created,
             sum(case when nvp.name = 'Fee' then value+0 else null end) as  Fee,
             max(case when nvp.name = 'Type' then value else null end) as  Type,
             max(case when nvp.name = 'Member' then value else null end) as  member
      from nvp
      group by groupid
     ) t
where member = 'Yes'
group by created;

事实上，根据SQL Fiddle（参见here），确实如此。这看起来与您尝试的基本相同。

名称值对表到列

1 个答案: