我需要你的mysql查询帮助。我有一个表“指标”:
create table metrics
(
guid binary(16) not null
primary key,
entry_guid binary(16) not null,
customer_guid binary(16) null,
metrics varchar(30) not null,
value int not null,
`_created` timestamp null,
`_updated` timestamp null
);
所以,我试着这样做:
SELECT t1.entry_guid as entry_guid, SUM(t1.`value`) as last_week, SUM(t2.`value`) as last_month
FROM metrics as t1, metrics as t2
WHERE t1.`_created` > NOW() - INTERVAL 7 DAY OR t2.`_created` > NOW() - INTERVAL 1 MONTH
GROUP BY t1.entry_guid
但在结果中,我得到了和使用sum()函数相同的奇怪结果
entry_guid last_week last_month
1 4613 4613
2 207 207
3 6003 6003
4 9108 9108
而且sum()func的结果很奇怪,因为我只有300行,每行的“value”字段等于1,所以max sum必须非常小。
所以,查询
SELECT t1.entry_guid as entry_guid, SUM(t1.`value`) as sum
FROM metrics as t1
GROUP BY t1.entry_guid
给了我
entry_guid sum
0x34303535636637643538396665633265 21
0x34313830656231666665393131326635 21
0x34336537663033653963303437356165 1
0x34363061653730313738313263386264 44
我需要从一个表中得到sum('value'),但条件不同。你能告诉我怎么做吗?先谢谢你。
1条答案
按热度按时间hyrbngr71#
使用条件聚合: