How to get latest record weekly within an SQL statement - sql

Question

I'm trying to export the latest records from SQL Server 2005 database once weekly. This is my table:
agent_name date ID
ALEX 2015-05-25 13
ALEX 2015-05-22 13
ALICE 2015-05-24 10
ALICE 2015-05-26 10
How to create output table should like this:
agent_name date ID
ALEX 2015-05-25 13
ALICE 2015-05-26 10
My SQL script:
SELECT a.agent_name,
a.date,
a.ID
FROM Payment a
INNER JOIN agentmaster b ON a.ID = b.ID2
WHERE b.agent ='Y'
AND a.date >= DATEADD(day, -7, GETDATE())

Answer 1

If you want latest rows for each ID and agent_name use this:
SELECT a.agent_name,
MAX(a.[date]) [date],
a.ID
FROM Payment a
GROUP BY
a.agent_name,
a.ID
If you want to have latest rows in each week use this:
SELECT a.agent_name,
a.date,
a.ID
FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY DATEPART(WEEK, [date]) ORDER BY [date] DESC) seq
FROM Payment ) a
WHERE
seq = 1
If you want latest rows for each ID and agent_name at each week use this:
;WITH p AS (
/* add your query here */
)
SELECT a.agent_name,
a.date,
a.ID
FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY agent_name, ID, DATEPART(WEEK, [date]) ORDER BY [date] DESC) seq
FROM p ) a
WHERE
seq = 1

Answer 2

Try This
SELECT ID, Agent_Name, MAX(Date) Max_Date
FROM AgentMaster
GROUP BY Agent_Name, ID
If you want to add the date filter then add the where condition
date >= DATEADD(day,-7, GETDATE())

Answer 3

This will return records from the first day of the current week to the last day of the current week
SELECT a.agent_name
,a.date
,a.ID
FROM Payment a INNER JOIN agentmaster b
ON a.ID = b.ID2
WHERE b.agent ='Y' AND
(a.date BETWEEN
DATEADD(wk, DATEDIFF(wk, 0, GetDate()),0) AND
DATEADD(wk, DATEDIFF(wk, 0, GETDATE()),6))

Answer 4

In this solution, I make a table in a CTE and defines the first day of week within a period. And then make a JOIN between the first day of weeks and our actual query
Sample data
DECLARE #tbl TABLE(agent_name VARCHAR(10) ,[date] date, Id INT)
INSERT #tbl
SELECT 'ALEX' , '2015-05-25' , 13 UNION
SELECT 'ALEX' , '2015-05-22' , 13 UNION
SELECT 'ALICE' , '2015-05-24' , 10 UNION
SELECT 'ALICE' , '2015-05-26' , 10
SELECT * FROM #tbl
Query
-- This period can be changed
DECLARE #StartDate date = '01/01/2015'
DECLARE #EndDate date = '01/01/2016'
;WITH Numbers (Number)
AS
(
SELECT number
FROM master..spt_values
WHERE [type] = 'P'
)
,firstDayOfWeek (fWDate)
AS
(
SELECT DATEADD(DAY, n.Number, #StartDate)
FROM Numbers AS n
WHERE n.Number <= DATEDIFF(DAY, #StartDate, #EndDate)
AND DATEPART(WEEKDAY, DATEADD(DAY, n.Number, #StartDate)) = 1 --Defines first day of week
)
SELECT t.agent_name, Max(t.date) AS [date], t.Id
FROM #tbl AS t
INNER JOIN firstDayOfWeek AS fw ON t.date >= fw.fWDate
AND t.[date] < DATEADD(DAY, 7, fw.fWDate)
GROUP BY t.Id, t.agent_name