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SQL Puzzle | Remove Duplicate Word(s) from the String/Sentence
Write a T-SQL function that removes the duplicate word(s) from the String/Sentence. Please check out the sample input and the expected output.
Sample Input
Id | InputString |
---|---|
1 | A very A long stringx, d D testing the string |
2 | A very A long string, d D testing the string |
4 | A very A long string. d D testing the string |
5 | Pawan Pawan |
Expected Output
Id | InputString | OutputString |
---|---|---|
1 | A very A long stringx, d D testing the string | A very long stringx, d testing the string |
2 | A very A long string, d D testing the string | A very long string, d testing the |
4 | A very A long string. d D testing the string | A very long string. d testing the |
5 | Pawan Pawan | Pawan |
Rules/Restrictions
- The challenge is to do it with T-SQL statements only.
- Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com
Script | use below script to create table and insert some sample data
-- CREATE TABLE RemoveDuplicateWords ( Id INT ,InputString VARCHAR(1000) ) GO INSERT INTO RemoveDuplicateWords VALUES (1,'A very A long stringx, d D testing the string' ), (2,'A very A long string, d D testing the string' ), (4,'A very A long string. d D testing the string' ), (5,'Pawan Pawan' ) GO SELECT * FROM RemoveDuplicateWords GO --
—
SOLUTION – 1
-- CREATE FUNCTION RemoveDupicateFromString ( @Inputs VARCHAR(1000) ,@Ignore VARCHAR(100) --Pipe Separated ) RETURNS VARCHAR(1000) AS BEGIN DECLARE @ProductTotals TABLE ( ProductID int, Revenue money ) DECLARE @V AS VARCHAR(1000) SET @V = '' DECLARE @IgnoreChrs VARCHAR(MAX) SET @IgnoreChrs = @Ignore DECLARE @finalString AS VARCHAR(1000) SET @finalString = '' DECLARE @InputString AS VARCHAR(MAX) SET @InputString = RTRIM(LTRIM(@Inputs)) DECLARE @Pawan TABLE ( Value VARCHAR(1) ) DECLARE @TempBills TABLE (strs VARCHAR(1000)) DECLARE @x1 AS XML SET @x1 = CAST('<a>'+ REPLACE(@IgnoreChrs,'|','</a><a>')+ '</a>' AS XML) INSERT INTO @Pawan SELECT t.value('.', 'VARCHAR(1)') Value FROM @x1.nodes('/A') AS x(t) INSERT INTO @TempBills SELECT @InputString strs ;WITH CTE1 AS ( SELECT SplitedValue , ROW_NUMBER() OVER (ORDER BY (SELECT 1)) rnk FROM ( SELECT CAST((''+replace(@InputString,' ' ,'')+'') as xml) xmlcol FROM @TempBills e ) s OUTER APPLY ( SELECT ProjectData.D.value('.', 'VARCHAR(MAX)') as SplitedValue FROM s.xmlcol.nodes('X') as ProjectData(D) )r ) SELECT @finalString = STUFF((SELECT ' ' + SplitedValue FROM ( SELECT SplitedValue , rnk FROM ( SELECT * , ROW_NUMBER() OVER (PARTITION BY col ORDER BY rnk) duprnk FROM ( SELECT * , RIGHT(SplitedValue,1) r , CASE WHEN Value IS NOT NULL THEN SUBSTRING(SplitedValue,0,LEN(SplitedValue)) ELSE SplitedValue END col FROM CTE1 LEFT JOIN @Pawan p ON p.Value = RIGHT(SplitedValue,1) )p )m WHERE m.duprnk = 1 )y ORDER BY rnk FOR XML PATH('')),1,1,'') RETURN @finalString END -- |
Usage
-- SELECT Id,InputString,dbo.RemoveDupicateFromString(InputString,',|;|.') OutputString FROM RemoveDuplicateWords GO --
Add a comment if you have a solution in mind. I would love to learn it. We all need to learn.
Enjoy !!! Keep Learning
Pawan Khowal
Http://MSBISkills.com