mySql query group by with order by date not working - php

Question

I have two tables like this
and I want latest data by date
tbl_fruit_info
+-----+--------+
| sId | sName |
+-----+--------+
| 1 | Apple |
| 2 | Banana |
| 3 | Orange |
+-----+--------+
tbl_fruit_data
+------------+----------+-------------+
| date | fruit_id | fruit_price |
+------------+----------+-------------+
| 2017-01-26 | 1 | 44.7 |
| 2017-01-27 | 1 | 51 |
| 2017-01-25 | 1 | 71.5 |
| 2017-01-21 | 2 | 44 |
| 2017-01-23 | 2 | 55 |
| 2017-01-24 | 2 | 71 |
+------------+----------+-------------+
I tried with this
SELECT tbl_fruit_info.*, tbl_fruit_data.*
FROM tbl_fruit_data
LEFT JOIN
tbl_fruit_info ON tbl_fruit_info.sId = tbl_fruit_data.fruit_id
GROUP BY
tbl_fruit_info.sId
ORDER BY
max(tbl_fruit_data.date) DESC;
The Output I am looking for is like this:
+-----+--------+----------------------------+
| sId | sName | date |fruit_price |
+-----+--------+----------------------------+
| 1 | Apple | 2017-01-27 | 51 |
| 2 | Banana | 2017-01-24 | 71 |
| 3 | Orange | 0000-00-00 | 0 |
+-----+--------+----------------------------+
But I get this:
+-----+--------+----------------------------+
| sId | sName | date |fruit_price |
+-----+--------+----------------------------+
| 1 | Apple | 2017-01-26 | 44.7 |
| 2 | Banana | 2017-01-21 | 44 |
+-----+--------+----------------------------+
Any assistance would be greatly appreciated.

Answer 1

select * from tbl_fruit_data f
left join tbl_fruit_info i ON i.sId = f.fruit_id
where f.Date =
(Select max(date) from tbl_fruit_data
where fruit_id = f.fruit_id)

Answer 2

SELECT fi.*, fd.*
FROM tbl_fruit_data fd
FULL OUTER JOIN tbl_fruit_info fi ON fi.sId = fd.fruit_id
WHERE fd.fruit_id IS NULL OR fd.date = (
SELECT max(fd_inner.date)
FROM tbl_fruit_data fd_inner
WHERE fd_inner.fruit_id = fd.fruit_id
)
ORDER BY fd.date DESC;
Update 2017-01-30: Incorporates rows in tbl_fruit_info that don't have a corresponding row in tbl_fruit_data, now.

Answer 3

Ok here goes.
**Get the latest prices on fruit, ADDED fruits not having a price
SELECT d1.date, d1.fruit_id, d1.fruit_price, i.sId, i.sName
FROM tbl_fruit_info i
LEFT JOIN tbl_fruit_data d1
ON d1.fruit_id = i.sId
WHERE d1.date = (SELECT MAX(d2.date)
FROM tbl_fruit_data d2
WHERE d2.fruit_id = d1.fruit_id
)
UNION
SELECT CAST('0001-01-01' AS datetime) date, i.sId fruit_id, 0 fruit_price, i.sId, i.sName
FROM tbl_fruit_info i
WHERE i.sId NOT IN (SELECT d2.fruit_id FROM tbl_fruit_data d2)
Sql fiddle for test on the same data provides in question:
http://sqlfiddle.com/#!9/872ed4/9
Used these definitions
CREATE TABLE tbl_fruit_info
(`sId` int, `sName` varchar(6))
;
INSERT INTO tbl_fruit_info
(`sId`, `sName`)
VALUES
(1, 'Apple'),
(2, 'Banana'),
(3, 'Orange')
;
CREATE TABLE tbl_fruit_data
(`date` datetime, `fruit_id` int, `fruit_price` int)
;
INSERT INTO tbl_fruit_data
(`date`, `fruit_id`, `fruit_price`)
VALUES
('2017-01-26 00:00:00', 1, 44.7),
('2017-01-27 00:00:00', 1, 51),
('2017-01-25 00:00:00', 1, 71.5),
('2017-01-21 00:00:00', 2, 44),
('2017-01-23 00:00:00', 2, 55),
('2017-01-24 00:00:00', 2, 71)
;

Answer 4

Using dadde's fiddle (with some tweaks) - and assuming that the MySQL tag is correct...
CREATE TABLE tbl_fruit_info
(`sId` int auto_increment PRIMARY KEY, `sName` varchar(6))
;
INSERT INTO tbl_fruit_info
(`sId`, `sName`)
VALUES
(1, 'Apple'),
(2, 'Banana'),
(3, 'Orange')
;
CREATE TABLE tbl_fruit_data
(`date` datetime, `fruit_id` int, `fruit_price` int, primary key (fruit_id,date))
;
INSERT INTO tbl_fruit_data
(`date`, `fruit_id`, `fruit_price`)
VALUES
('2017-01-26 00:00:00', 1, 44.7),
('2017-01-27 00:00:00', 1, 51),
('2017-01-25 00:00:00', 1, 71.5),
('2017-01-21 00:00:00', 2, 44),
('2017-01-23 00:00:00', 2, 55),
('2017-01-24 00:00:00', 2, 71)
;
SELECT a.sid
, a.sname
, COALESCE(b.date,'0000-00-00') date
, COALESCE(b.fruit_price,0) fruit_price
FROM tbl_fruit_info a
LEFT
JOIN
( SELECT x.*
FROM tbl_fruit_data x
JOIN
( SELECT fruit_id, MAX(date) date
FROM tbl_fruit_data
GROUP
BY fruit_id
) y
ON y.fruit_id = x.fruit_id
AND y.date = x.date) b
ON b.fruit_id = a.sid;
+-----+--------+---------------------+-------------+
| sid | sname | date | fruit_price |
+-----+--------+---------------------+-------------+
| 1 | Apple | 2017-01-27 00:00:00 | 51 |
| 2 | Banana | 2017-01-24 00:00:00 | 71 |
| 3 | Orange | 0000-00-00 | 0 |
+-----+--------+---------------------+-------------+

Answer 5

create table #t1
(id int,name varchar(100));
create table #t2(
[date] date,
id int,
price float)
insert into #t1
select 1,'Apple'
union
select 2,'Banana'
insert into #t2
select getdate()-3,1,33.2
union
select getdate()-2,1,30.5
union
select getdate()-4,1,23.4
union
select getdate()-3,2,21
union
select getdate()-2,2,35
Query
select q.name,t2.* from (
select t1.id,t1.name,MAX(t2.date) as date from #t1 t1
inner join #t2 t2 on t1.id=t2.id
group by t1.id,t1.name
) as q inner join #t2 t2
on q.id=t2.id and t2.date=q.date
Edit: Fixed, replaced CTE with subquery, thanks dadde for pointing out CTE isn't supported in MySQL. CTE or Subquery does the same job here