Updating table based on conditions stored in another table

• Abu Dina

  SSChampion

  Points: 14155

  More actions

  January 22, 2014 at 3:03 am

  #281447

  When I'm performing a de-duplication exercise on a mailing list I produce a table of potential matches (i.e. records that have something in common like a postcode or company name etc). Then for each matching pair I compare all their parts to each other and produce a table like the below:

  

  As you can see I have the IDs of the matching pair, type of match and various comparison scores.

  To decide on a match I have over 30 UPDATE statements similar to the below:

  UPDATE PotentialMatches

  SET Individual = 'Match Type 1'

  WHERE Name_Score = 1

  AND Premise_Score = 1

  AND Address_Score = 100

  UPDATE PotentialMatches

  SET Individual = 'Match Type 2'

  WHERE Name_Score = 1

  AND MobileTelephone-Score = 1

  This was hardcoded into my stored procedure which was a pain as every time I wanted to introduce a new match rule I had to update the sproc which isn't ideal.

  To get around this I created a MatchRules table like the below:

  

  The idea is to loop through the rules and have just one UPDATE statement so that in future I can just add more match rules to this table without touching the sproc. But this isn't working as expected! Sample data provided below as well as the code that's causing the problem. if anyone can suggest a fix or an alternative method to solving this problem I would really appreciate it!

  CREATE TABLE dbo.MatchResults(

  Master_ID INT,

  Duplicate_ID INT,

  MatchKeyType INT,

  Name_Score INT,

  OrgName_Score INT,

  Premise_Score INT,

  Address_Score INT,

  Postcode_Score INT,

  HomeTelephone_Score INT,

  MobileTelephone_Score INT,

  Email_Score INT,

  Individual_Match TINYINT DEFAULT(0),

  Site_Match TINYINT DEFAULT(0))

  INSERT INTO dbo.MatchResults (

  Master_ID,

  Duplicate_ID,

  MatchKeyType,

  Name_Score,

  OrgName_Score,

  Premise_Score,

  Address_Score,

  Postcode_Score,

  HomeTelephone_Score,

  MobileTelephone_Score,

  Email_Score)

  SELECT 247355, 152880, 11, 0, 3, 0, 50, 1, 4, 5, 5 UNION ALL

  SELECT 67328, 195769, 2, 2, 1, 0, 50, 0, 0, 0, 5 UNION ALL

  SELECT 157281, 178807, 10, 2, 1, 1, 70, 0, 0, 0, 5 UNION ALL

  SELECT 68723, 22872, 12, 1, 3, 1, 25, 0, 0, 0, 5

  CREATE TABLE MatchRules(

  MatchRuleID int NOT NULL,

  NameScore tinyint NULL,

  CompanyScore tinyint NULL,

  Company2Score tinyint NULL,

  PremiseScore tinyint NULL,

  AddressScore tinyint NULL,

  PostcodeScore tinyint NULL,

  TelephoneScore tinyint NULL,

  MobileScore tinyint NULL,

  EmailScore tinyint NULL,

  Customer varchar(50) NULL,

  MatchLevel varchar(20) NULL,

  IsActive bit NULL)

  INSERT INTO MatchRules (MatchRuleID, NameScore, CompanyScore, Company2Score, PremiseScore, AddressScore,

  PostcodeScore, TelephoneScore, MobileScore, EmailScore, Customer, MatchLevel, IsActive)

  SELECT 1,1,NULL,NULL,1,100,1,NULL,NULL,NULL, 'ALL','Individual', 1 UNION ALL

  SELECT 2,2,NULL,NULL,1,100,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 3,3,NULL,NULL,1,100,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 4,1,NULL,NULL,1,80,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 5,2,NULL,NULL,1,80,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 6,3,NULL,NULL,1,80,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 7,1,NULL,NULL,1,40,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 8,2,NULL,NULL,1,40,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 9,3,NULL,NULL,1,40,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 10,1,NULL,NULL,NULL,100,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 11,2,NULL,NULL,NULL,100,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 12,3,NULL,NULL,NULL,100,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 13,1,NULL,NULL,NULL,80,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 14,2,NULL,NULL,NULL,80,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 15,3,NULL,NULL,NULL,80,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 16,1,NULL,NULL,NULL,40,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 17,2,NULL,NULL,NULL,40,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 18,3,NULL,NULL,NULL,40,1,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 19,1,NULL,NULL,1,100,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 20,2,NULL,NULL,1,100,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 21,3,NULL,NULL,1,100,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 22,1,NULL,NULL,1,80,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 23,2,NULL,NULL,1,80,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 24,3,NULL,NULL,1,80,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 25,1,NULL,NULL,1,40,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 26,2,NULL,NULL,1,40,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 27,3,NULL,NULL,1,40,NULL,NULL,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 28,1,NULL,NULL,NULL,NULL,NULL,1,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 29,2,NULL,NULL,NULL,NULL,NULL,1,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 30, 3,NULL,NULL,NULL,NULL,NULL,1,NULL,NULL,'ALL','Individual',1 UNION ALL

  SELECT 31, 1,NULL,NULL,NULL,NULL,NULL,NULL,1,NULL,'ALL','Individual',1 UNION ALL

  SELECT 32, 2,NULL,NULL,NULL,NULL,NULL,NULL,1,NULL,'ALL','Individual',1 UNION ALL

  SELECT 33, 3,NULL,NULL,NULL,NULL,NULL,NULL,1,NULL,'ALL','Individual',1 UNION ALL

  SELECT 34, 1,NULL,NULL,NULL,NULL,NULL,NULL,NULL,1,'ALL','Individual',1 UNION ALL

  SELECT 35, 2,NULL,NULL,NULL,NULL,NULL,NULL,NULL,1,'ALL','Individual',1 UNION ALL

  SELECT 36, 3,NULL,NULL,NULL,NULL,NULL,NULL,NULL,1,'ALL','Individual',1

  And this is my code:

  DECLARE @MatchRuleID TINYINT

  DECLARE @NameScore TINYINT

  DECLARE @CompanyScore TINYINT

  DECLARE @Company2Score TINYINT

  DECLARE @PremiseScore TINYINT

  DECLARE @AddressScore TINYINT

  DECLARE @PostcodeScore TINYINT

  DECLARE @TelephoneScore TINYINT

  DECLARE @MobileScore TINYINT

  DECLARE @EmailScore TINYINT

  DECLARE MatchingRules CURSOR FOR

  SELECT

  MatchRuleID, NameScore, CompanyScore, Company2Score, PremiseScore, AddressScore, PostcodeScore,

  TelephoneScore, MobileScore, EmailScore

  FROM

  dbo.MatchRules

  WHERE IsActive = 1

  AND MatchLevel = 'Individual'

  OPEN MatchingRules

  FETCH NEXT FROM MatchingRules INTO @MatchRuleID, @NameScore, @CompanyScore, @Company2Score, @PremiseScore,

  @AddressScore, @PostcodeScore, @TelephoneScore, @MobileScore, @EmailScore

  WHILE @@FETCH_STATUS = 0

  BEGIN

  UPDATE MatchResults

  SET Individual_Match = @MatchRuleID

  WHERE Name_Score <= ISNULL(@NameScore, 5)

  AND OrgName_Score <= ISNULL(@CompanyScore, 5)

  AND Premise_Score <= ISNULL(@PremiseScore, 5)

  AND Address_Score >= ISNULL(@AddressScore, 0)

  AND Postcode_Score <= ISNULL(@PostcodeScore, 5)

  AND HomeTelephone_Score <= ISNULL(@TelephoneScore, 5)

  AND MobileTelephone_Score <= ISNULL(@MobileScore, 5)

  AND Email_Score <= ISNULL(@EmailScore, 5)

  AND Individual_Match = 0

  FETCH NEXT FROM MatchingRules INTO @MatchRuleID, @NameScore, @CompanyScore, @Company2Score, @PremiseScore,

  @AddressScore, @PostcodeScore, @TelephoneScore, @MobileScore, @EmailScore

  END

  CLOSE MatchingRules

  DEALLOCATE MatchingRules

  ---------------------------------------------------------

  It takes a minimal capacity for rational thought to see that the corporate 'free press' is a structurally irrational and biased, and extremely violent, system of elite propaganda.
  David Edwards - Media lens[/url]

  Society has varying and conflicting interests; what is called objectivity is the disguise of one of these interests - that of neutrality. But neutrality is a fiction in an unneutral world. There are victims, there are executioners, and there are bystanders... and the 'objectivity' of the bystander calls for inaction while other heads fall.
  Howard Zinn

• David Burrows

  SSC Guru

  Points: 65138

  More actions

  January 22, 2014 at 7:23 am

  #1682390

  ;WITH result (Master_ID,MatchRuleID) AS (

  SELECTmr.Master_ID,MIN(r.MatchRuleID)

  FROMMatchRules r

  JOIN MatchResults mr

  ON mr.Name_Score <= ISNULL(r.NameScore, 5)

  AND mr.OrgName_Score <= ISNULL(r.CompanyScore, 5)

  AND mr.Premise_Score <= ISNULL(r.PremiseScore, 5)

  AND mr.Address_Score >= ISNULL(r.AddressScore, 0)

  AND mr.Postcode_Score <= ISNULL(r.PostcodeScore, 5)

  AND mr.HomeTelephone_Score <= ISNULL(r.TelephoneScore, 5)

  AND mr.MobileTelephone_Score <= ISNULL(r.MobileScore, 5)

  AND mr.Email_Score <= ISNULL(r.EmailScore, 5)

  WHEREr.IsActive = 1

  ANDr.MatchLevel = 'Individual'

  GROUPBY mr.Master_ID

  )

  UPDATEmr

  SETmr.Individual_Match = result.MatchRuleID

  FROMMatchResults mr

  JOIN result ON result.Master_ID = mr.Master_ID

  EDITED:

  p.s. This is just a rewrite of the cursor.

  Is there a particular problem with the matching?

  Far away is close at hand in the images of elsewhere.
  Anon.