How to fetch current and next row value in same row using MSSQL

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I am new to SQL and stuck in a problem where i have to fetch values in below way:
existing datatable

ID | Date
01 | 3/3/17
02 | 4/3/17
03 | 8/3/17
04 | 1/4/17

I want the data should be selected in below way:

ID  | Date1  | Date2
01  | 3/3/17 | 4/3/17 
02  | 4/3/17 | 8/3/17
03  | 8/3/17 | 1/4/17
04  | 1/4/17 | null

Please guide me SQL query to select above way.

What I have tried:

from some link I tried:

SQL

SELECT A.Id , 
               A.Date AS CurDate , 
               B.Date AS NxtDate 
FROM words AS A
LEFT JOIN words AS B ON A.Date < B.Date

(ID will be GUID, so I have not consider Id in any condition)
This is not giving expected result..

Posted 16-Jul-18 4:12am

ali khanna

Updated 16-Jul-18 22:39pm

Nelek

v3

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Comments

kmoorevs 16-Jul-18 11:34am

Is that last date correct? (or should it be 2018) If the dates should be ordered ascending you can use subqueries to do what you want. If so, I can provide an example that works.

2 solutions

Solution 1

This works with your current data; however, you are on your own if you switch to a GUID

SQL

DECLARE @Table TABLE (ID INT IDENTITY(1,1) NOT NULL, TheDate DATE)

INSERT @Table(TheDate) 
values ('03/03/2017'), ('04/03/2017'), ('08/03/2017'), ('01/04/2017')

SELECT a.ID
     , Date1 = a.TheDate
     , Date2 = b.TheDate

FROM            @Table  a
LEFT OUTER JOIN @Table  b ON a.ID + 1 = b.ID

ORDER BY A.ID

Posted 16-Jul-18 4:34am

MadMyche

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CHill60 · Accepted Answer · 2018-07-16T22:40:00

Looking at your expected data it would appear to be in Date order. You can assign a row number on that basis which replaces the ID used in Solution 1 (and would therefore work with a GUID as the ID) e.g.

SQL

DECLARE @Table TABLE (ID INT IDENTITY(1,1) NOT NULL, TheDate DATE)

INSERT @Table(TheDate) 
values ('03-MAR-2017'), ('04-MAR-2017'), ('08-MAR-2017'), ('01-APR-2017')
;WITH CTE AS
(
    SELECT ID, TheDate
    ,ROW_NUMBER() OVER(ORDER BY TheDate) AS rn
    FROM @Table
)
SELECT CTE.ID, CTE.TheDate As Date1, NXT.TheDate As Date2
FROM CTE
LEFT OUTER JOIN CTE NXT ON NXT.rn = CTE.rn + 1

If you have SQL Server 2012 (not the Express version) or a later version (including 2014 Express), then you can use Window functions instead (far neater)

SQL

SELECT ID, TheDate, LEAD(TheDate,1) OVER (ORDER BY TheDate) FROM @Table