MySQL select field from one table with different conditions - mysql

Question

I need your help with mysql query.
I have one table 'metrics':
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
);
So, I'm trying to do something like this:
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
But in result i get identical strange result of using SUM() function
entry_guid last_week last_month
1 4613 4613
2 207 207
3 6003 6003
4 9108 9108
Moreover result of SUM() func is strange, because I have only 300 rows and 'value' field in each row is equal 1, so max sum must be very little.
So, the query
SELECT t1.entry_guid as entry_guid, SUM(t1.`value`) as sum
FROM metrics as t1
GROUP BY t1.entry_guid
gives me
entry_guid sum
0x34303535636637643538396665633265 21
0x34313830656231666665393131326635 21
0x34336537663033653963303437356165 1
0x34363061653730313738313263386264 44
I need to get SUM('value') from one table, but with different conditions.
Can you show me how? Thank you in advance.

Answer 1

Use conditional aggregation:
SELECT m.entry_guid as entry_guid,
SUM(CASE WHEN m.`_created` > NOW() - INTERVAL 7 DAY THEN t1.`value` ELSE 0 END) as last_week,
SUM(CASE WHEN m.`_created` > NOW() - INTERVAL 1 MONTH THEN t2.`value` ELSE 0 END) as last_month
FROM metrics m
GROUP BY m.entry_guid;