Rolling 3 Years of data with desired format - sql-server

Question

Start Date = 2016-03-01
End Date = 2019-02-15
I need the query/Function which should retrive the below result based on start and end date. I have a query to frame the result .But i need some query/function to retrive result set in 5 to 10 sec with performance

Answer 1

You mean like
SELECT * FROM table WHERE [start date]>='2016-03-01' AND [end date]<='2019-02-15'
Am I missing something? This seems too simple to ask as a question
If your problem is performance perhaps consider indexing start and end date columns, and if you're only getting a couple other values from the table include those in the index too.
CREATE INDEX IX_table_startdate_enddate
ON schema.table ([start date], [end date])
INCLUDE (othercolumn1, othercolumn2);
It means that queries like:
SELECT othercolumn1, othercolumn2 FROM table
WHERE [start date]>='2016-03-01' AND [end date]<='2019-02-15'
Can be answered from the index without having to connect the index to the table to pull the desired data
If you still can't wrong enough out of it after that perhaps you have a design flaw in your app; pilling a db for a massive amount of data in a tight interval could be solved another way like only emitting events when data actually changes

Answer 2

It's just occurred to me you're probably looking for a query to generate that result set from nothing. In sqlserver we can use a recursive cte:
DECLARE #dateFrom DATE = '2016-03-01'
DECLARE #dateTo DATE = '2019-02-15'
with d as (
SELECT #datefrom as m
UNION ALL
SELECT DATEADD(MONTH,1,reqDate)
FROM d
WHERE DATEADD(MONTH,1,reqDate) <= #dateto
),
SELECT
CONCAT(
DATENAME(MONTH, #dateFrom), ' ',
CASE WHEN MONTH(d.m) < MONTH(#dateFrom) THEN YEAR(d.m) - 1 ELSE YEAR(d.m) END, '-',
DATENAME(MONTH, #dateTo), ' ',
CASE WHEN MONTH(d.m) < MONTH(#dateFrom) THEN YEAR(d.m) ELSE YEAR(d.m) +1 END
) as range,
MONTH(d.m) as month,
d.m as startdate,--do not use spaces in column names
CASE WHEN #dateTo < EOMONTH(d.m) then #dateTo ELSE EOMONTH(d.m) END as enddate --or dateadd 1 month then dateadd -1 day if you don't have eomonth
FROM d
OPTION(MAXRECURSION 0);

Answer 3

Same format with your result try it.
DECLARE #StartDate DATETIME, #EndDate DATETIME
SET #StartDate = '2016-03-01'
SET #EndDate = '2038-02-15'
;WITH CTEs AS
(
SELECT #StartDate as [Start Date]
UNION ALL
SELECT DATEADD(MONTH,1,[Start Date])
FROM CTEs WHERE DATEADD(MONTH,1,[Start Date]) <= #EndDate
)
SELECT
CONCAT(
DATENAME(MONTH, #StartDate), ' ',
CASE WHEN MONTH([Start Date]) < MONTH(#StartDate) THEN YEAR([Start Date]) - 1 ELSE YEAR([Start Date]) END, '-',
DATENAME(MONTH, #EndDate), ' ',
CASE WHEN MONTH([Start Date]) < MONTH(#StartDate) THEN YEAR([Start Date]) ELSE YEAR([Start Date]) + 1 END
) AS [Range],
MONTH([Start Date]) AS [Month],
CONVERT(VARCHAR(10),[Start Date],101) AS [Start Date],
CONVERT(VARCHAR(10),(CASE WHEN [Start Date] <> DATEFROMPARTS(YEAR(#EndDate),MONTH(#EndDate),1)
THEN EOMONTH([Start Date])
ELSE #EndDate
END),101) AS [End Date]
FROM CTEs
OPTION(MAXRECURSION 0);