Date Range as Parameter

Question

Hi ,
         I have a column with date range in the format 07/21/2014-07/21/2014,
        07/16/2014-07/16/2014
       07/22/2014-07/22/2014
there will be thousands of records like this.
In ssrs I need to pass a pramater with date range =07/16/2014-07/22/2014 then it should display all the records between those dates. I not getting the logic here how to write it.  it is pulling all the dates it is not filtering the dates right now.
Can anybody help me on this issue..
BALUSUSRIHARSHA

Answer 1

It will be much easier if you have two columns holding the range and you pass two parameters to find out the overlapping ranges.
select c1, ..., cn
from T
where @sdt <= dt2 and @edt >= dt1; -- considering the range (dt1, dt2)
or just the exact range:
select c1, ..., cn
from T
where dt1 = @sdt and dt2 = @edt; -- considering the range (dt1, dt2)
Since you store the range in one column of character data type then you need to split the value in two, the start and end points of the range, and do the same with the parameter but this will be easier to change the report to send two parameters instead
one.
Search in this forum or Transact-SQL forum for a function to split a string. Here is a good reference:
Arrays and Lists in SQL Server
http://www.sommarskog.se/arrays-in-sql.html
Once you have created the function, it is a matter of using the APPLY operator, pivot the range and use same predicate as in my first query.
Here is an example but I would encorage you to change the model.
SET NOCOUNT ON;
USE tempdb;
GO
--Itzik's VATN
CREATE FUNCTION dbo.GetNums(@n AS BIGINT) RETURNS TABLE
AS
RETURN
WITH
L0 AS(SELECT 1 AS c UNION ALL SELECT 1),
L1 AS(SELECT 1 AS c FROM L0 AS A CROSS JOIN L0 AS B),
L2 AS(SELECT 1 AS c FROM L1 AS A CROSS JOIN L1 AS B),
L3 AS(SELECT 1 AS c FROM L2 AS A CROSS JOIN L2 AS B),
L4 AS(SELECT 1 AS c FROM L3 AS A CROSS JOIN L3 AS B),
L5 AS(SELECT 1 AS c FROM L4 AS A CROSS JOIN L4 AS B),
Nums AS(SELECT ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) AS n FROM L5)
SELECT TOP (@n) n FROM Nums ORDER BY n;
GO
--Erland's split_me
CREATE FUNCTION dbo.inline_split_me(@param nvarchar(MAX))
RETURNS TABLE AS
RETURN(
SELECT
ROW_NUMBER() OVER(ORDER BY n) AS rn,
LTRIM(rtrim(convert(nvarchar(4000),
substring(@param, n,
charindex(N'-' COLLATE Slovenian_BIN2,
@param + convert(nvarchar(MAX), N'-'),
n) - n)
))) AS Value
FROM dbo.GetNums(LEN(@param))
WHERE substring(convert(nvarchar(MAX), N'-') + @param, n, 1) = N'-' COLLATE Slovenian_BIN2
GO
DECLARE @r varchar(21) = '07/16/2014-07/22/2014';
DECLARE @T TABLE (dt_range varchar(21));
INSERT INTO @T (dt_range)
VALUES
('07/21/2014-07/21/2014'),
('07/16/2014-07/16/2014'),
('07/22/2014-07/22/2014'),
('07/23/2014-07/25/2014');
SELECT
T.dt_range,
R.sdt,
R.edt,
W.p_sdt,
W.p_edt
FROM
@T AS T
CROSS APPLY
SELECT
CAST([1] AS date) AS sdt,
CAST([2] AS date) AS edt
FROM
dbo.inline_split_me(T.dt_range) AS A
PIVOT
MAX(Value)
FOR rn IN ([1], [2])
) AS P
) AS R
CROSS JOIN
SELECT
CAST([1] AS date) AS p_sdt,
CAST([2] AS date) AS p_edt
FROM
dbo.inline_split_me(@r) AS A
PIVOT
MAX(Value)
FOR rn IN ([1], [2])
) AS P
) AS W
WHERE
R.sdt <= W.p_edt
AND R.edt >= W.p_sdt;
GO
DROP FUNCTION dbo.inline_split_me, dbo.GetNums;
GO
Notice that the last row inserted is not part of the result set because it falls outside of the parameter date range.
AMB
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