How do I collapse contiguous Date Ranges in SQL?

Hi,
In the data below, I want to collapse the contiguous date ranges with the same value (3.7) into a single date range. I have tried and tried to come up with something but am stuck. Does anyone know how to accomplish?
DECLARE @Have TABLE(B DATE, E DATE, R DECIMAL(18, 1))
INSERT INTO @Have VALUES
('2014-08-22', '2014-12-31', 4.0)
, ('2015-01-01', '2015-03-29', 3.7) -- same value, contingious date ranges
, ('2015-03-30', '2015-03-31', 3.7) -- same value, contingious date ranges
, ('2015-04-01', '2015-09-30', 4.0)
SELECT * FROM @Have
DECLARE @Want TABLE(B DATE, E DATE, R DECIMAL(18, 1))
INSERT INTO @Want VALUES
('2014-08-22', '2014-12-31', 4.0)
, ('2015-01-01', '2015-03-31', 3.7) -- want to collapse into 1 date range
, ('2015-04-01', '2015-09-30', 4.0)
SELECT * FROM @Want
Thanks

Hi tballard,
The posts from Jingyang and Cooper would be perfect only in the case that there’s no date gap between your rows. In addition to their posts, if in any case there would be a gap, please refer my code below, which works in either case.
DECLARE @Have TABLE(B DATE, E DATE, R DECIMAL(18, 1))
INSERT INTO @Have VALUES
('2014-08-22', '2014-12-30', 3.7) --same value , date gap
, ('2015-01-01', '2015-03-29', 3.7) -- same value, contingious date ranges
, ('2015-03-30', '2015-03-31', 3.7) -- same value, contingious date ranges
, ('2015-04-01', '2015-09-27', 4.0) --same value, date gap
, ('2015-10-1', '2015-12-30', 4.0) --same value, date gap
;WITH CTE1 AS(
SELECT H1.B B1,H1.E E1,H1.R R1,H2.B B2,H2.E E2,ISNULL(H2.R,0) R2,ROW_NUMBER() OVER(ORDER BY H1.B) RN FROM @HAVE H1 LEFT JOIN @HAVE H2 ON DATEDIFF(DAY,H1.B,H2.E)=-1
CTE2 AS(
SELECT B1,E1,R1 FROM CTE1 WHERE R1 != R2
CTE3 AS(
SELECT B1,E1,RN,B2 FROM CTE1 WHERE R1=R2
CTE4 AS(
Select min(B2) B, Max(E1) E from (
SELECT B2,E1,RN-row_number() Over(Order by B1) groupByCol
FROM CTE3
) t
Group by groupByCol
SELECT
C2.B1,ISNULL(C4.E,C2.E1),C2.R1
FROM CTE2 C2 LEFT JOIN CTE4 C4 ON C2.B1=C4.B
If you have any question, feel free to let me know.
Best regards,
Eric Zhang

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