MySQL :: group by between price AND two dates - mysql

Question

I have a table like following columns:
id date price pid
---------------------------
1 2015-02-01 34 2
2 2015-02-02 34 2
3 2015-02-03 34 2
4 2015-02-04 78 2
5 2015-02-05 78 2
6 2015-02-06 78 2
7 2015-02-07 52 2
8 2015-02-08 52 2
9 2015-02-09 52 2
10 2015-02-10 34 2
11 2015-02-11 34 2
12 2015-02-12 34 2
Now I want following result:
date_from date_to price pid
-------------------------------------
2015-02-01 2015-02-03 34 2
2015-02-04 2015-02-06 78 2
2015-02-07 2015-02-09 52 2
2015-02-10 2015-02-12 34 2
IMPORTANT:
I don't want to group the price "34" in this case.

Answer 1

One solution i can think of using user defined variables also i assume the id part is set to auto_increment
select min(t1.date) date_from,
max(t1.date) date_to,
t1.price,
t1.pid
from (
select t.*,
#r:= case when #g = price then #r else #r + 1 end r,
#g:= price g
from test t
cross join (select #g:=null,#r:=0) t
order by id
) t1
group by t1.r
DEMO

Answer 2

Borrowing M Khalid Junaid's fiddle...
SELECT a.date date_from
, MIN(c.date) date_to
, price
, pid
FROM test a
LEFT
JOIN test b
ON b.pid = a.pid
AND b.price = a.price
AND b.id = a.id - 1
LEFT
JOIN test c
ON c.pid = a.pid
AND c.price = a.price
AND c.id >= a.id
LEFT
JOIN test d
ON d.pid = a.pid
AND d.price = a.price
AND d.id = c.id + 1
WHERE b.id IS NULL
AND c.id IS NOT NULL
AND d.id IS NULL
GROUP
BY a.id, a.price, a.pid;
http://sqlfiddle.com/#!2/478f9/6

Answer 3

Try below query, it will group by three records on basis of date and price
SELECT min(created) AS date_from, max(created) AS date_to, price, pid
FROM t1
GROUP BY price, floor(DATEDIFF("2015-02-01", created) / 3);

Answer 4

Try this in MySQL. Here app_date is Date in your question:
set #rownum=1;
select min(app_date),max(app_date),price,pid from
(select t.id1 id,t.app_date app_date,t.price1 price,t.pid pid,
case when (t.price1=t.price2 or t.price2 is null) then #rownum else #rownum:=#rownum+1 end temp_num from
(select a.id id1,b.id id2,a.app_date app_date,a.price price1,b.price price2,a.pid pid from
test a left outer join test b on a.id=b.id+1) t
order by id1) temp
group by price,pid,temp_num
order by min(app_date);