Find difference pattern of the given sequence.
This one is from the interview question I have asked. A sequence was given to me and asked to write a SQL query to find the difference pattern of the sequence and complete the sequence by adding missing numbers. Give sequence: '1,5,13,21,25,29,41' Below is the query to find the answer: SET NOCOUNT ON DECLARE @temp AS TABLE ( Id INT IDENTITY , Nums INT , NextNum INT DEFAULT 0 , Pattern AS ( NextNum - Nums ) ) INSERT @temp ( Nums ) SELECT * FROM dbo . Split ( '1,5,13,21,25,29,41' , ',' ) -- Here assume that Split function you have added already OR please follow the link -- http://anishrana.blogspot.in/2012/03/split-string-in-sql-server-using-xml.html -- and create one. UPDATE a SET NextNum = b . Nums FROM @temp a JOIN @temp b ON a . Id = ( b . Id - 1 ) DECLARE @pattern INT = NULL, @firstNum INT = NULL, @lastNum INT = NULL SE