2波のマッチング。 2番目の "Wave"は最初の "Wave"に基づいています

Question

テーブルからレコードを照合する必要のある「マッチング」シナリオがあります。

私はNorthwindデータベースを使用するために私の状況を変えました。

データの「セット」（以下の「@holderテーブル」に記載）がある場合、以下の基準に基づいて一致を見つける必要があります。

以下の二つ以上にLASTNAMEおよびFIRSTNAME一致、一致の両方の場合：（都市状態一緒にORファスナー）、携帯電話、拡張

LASTNAME OR FIRSTNAMEいずれかマッチの一つは、上で一致する場合次の三つ以上：（都市国家の集まりやファスナー）、携帯電話、私はシティ - の組み合わせに一致する必要があることを意味し、「都市国家の集まりやジップ」という 拡張子

注意州と地方........またはzip ..........もし3つが一致すれば（city-state-and-zip）、それはまだ"（Col umnCityStateZipEnum + ColumnHomePhoneEnum + ColumnExtensionEnum）」と計算されます。

私は以下を考え出しました。しかし、私は左結合を持っています。

SQLでこの種の問題を実行する別の方法はありますか？

Use Northwind /* Or NorthwindPartial */ 
GO 

declare @holder table (holderidentitykey int identity (1,1), lastname varchar(32) , firstname varchar(48) , city varchar(32) , stateabbr varchar(32) , zip varchar(5) , homephone varchar(16) , extension varchar(8)) 

insert into @holder (lastname , firstname , city , stateabbr, zip, homephone , extension) 
select null , null, null, null, null , null, null 
union all select 'Davolio' , 'Nancy', null, null, '98122' , '(206) 555-9857', null /* should 'match'. lastname, firstname and TWO of the other data-elements */ 
union all select 'Davolio' , null, null, null, null , null, null 
union all select 'Fuller' , 'Andrew', 'Tacoma', 'WA', null , null, null 
union all select 'Peacock' , 'MaggyNotAMatchNoPhone', 'Redmond', 'WA', '98052' , null, null 
union all select 'Peacock' , 'MaggyNotAMatchWithPhoneAndExtension', 'Redmond', 'WA', '98052' , '(206) 555-8122', '5176' /* should 'match'. lastname and THREE of the other data-elements */ 

/* 

    If both lastname and firstname match, match on TWO or more of the following : (city-state-together OR zip) , phone, extension 

    If one of either lastname OR firstname match, match on THREE or more of the following : (city-state-together OR zip) , phone, extension 
*/ 


select distinct * from 
(
    select 
    holderidentitykey, 
    ColumnLastNameFirstNameEnum = 
     case 
      when h.lastname = eLastName.LastName and h.firstname = eFirstName.FirstName then 2 
      when h.lastname = eLastName.LastName then 1 
      when h.firstname = eFirstName.FirstName then 1 
      else 0 
     end 
, 
    ColumnCityStateZipEnum = 
     case 
      when h.zip = eZip.PostalCode then 1 
      when h.city = eCity.City and h.stateabbr = eState.Region then 1 
      else 0 
     end 
, 
    ColumnHomePhoneEnum = 
     case 
      when h.homephone = eHomePhone.HomePhone then 1 
      else 0 
     end 
, 
    ColumnExtensionEnum = 
     case 
      when h.extension = eExtension.Extension then 1 
      else 0 
     end 
    , eLastName.LastName , eFirstName.FirstName, eZip.PostalCode, eCity.City, eState.Region, eHomePhone.HomePhone, eExtension.Extension 
    from 
    @holder h 
    left join dbo.Employees eLastName on h.lastname = eLastName.LastName 
    left join dbo.Employees eFirstName on h.firstname = eFirstName.FirstName 
    left join dbo.Employees eZip on h.zip = eZip.PostalCode 
    left join dbo.Employees eCity on h.city = eCity.City 
    left join dbo.Employees eState on h.stateabbr = eState.Region 
    left join dbo.Employees eHomePhone on h.homephone = eHomePhone.HomePhone 
    left join dbo.Employees eExtension on h.extension = eExtension.Extension 
) as derived1 
where 
    derived1.ColumnLastNameFirstNameEnum >= 2 and (ColumnCityStateZipEnum + ColumnHomePhoneEnum + ColumnExtensionEnum) >= 2 
    OR 
    derived1.ColumnLastNameFirstNameEnum >= 1 and (ColumnCityStateZipEnum + ColumnHomePhoneEnum + ColumnExtensionEnum) >= 3 



-- select * from dbo.Employees e 

ノースウィンドの「部分的な」作成は、便利な機能がない場合に作成されます。

SET NOCOUNT ON 
GO 

USE master 
GO 
if exists (select * from sysdatabases where name='NorthwindPartial') 
     drop database NorthwindPartial 
go 

DECLARE @device_directory NVARCHAR(520) 
SELECT @device_directory = SUBSTRING(filename, 1, CHARINDEX(N'master.mdf', LOWER(filename)) - 1) 
FROM master.dbo.sysaltfiles WHERE dbid = 1 AND fileid = 1 

EXECUTE (N'CREATE DATABASE NorthwindPartial 
    ON PRIMARY (NAME = N''NorthwindPartial'', FILENAME = N''' + @device_directory + N'northwndPartial.mdf'') 
    LOG ON (NAME = N''NorthwindPartial_log'', FILENAME = N''' + @device_directory + N'northwndPartial.ldf'')') 
go 


GO 

set quoted_identifier on 
GO 

/* Set DATEFORMAT so that the date strings are interpreted correctly regardless of 
    the default DATEFORMAT on the server. 
*/ 
SET DATEFORMAT mdy 
GO 
use "NorthwindPartial" 
go 

if exists (select * from sysobjects where id = object_id('dbo.Employees') and sysstat & 0xf = 3) 
    drop table "dbo"."Employees" 
GO 
CREATE TABLE "Employees" (
    "EmployeeID" "int" IDENTITY (1, 1) NOT NULL , 
    "LastName" nvarchar (20) NOT NULL , 
    "FirstName" nvarchar (10) NOT NULL , 
    "Title" nvarchar (30) NULL , 
    "TitleOfCourtesy" nvarchar (25) NULL , 
    "BirthDate" "datetime" NULL , 
    "HireDate" "datetime" NULL , 
    "Address" nvarchar (60) NULL , 
    "City" nvarchar (15) NULL , 
    "Region" nvarchar (15) NULL , 
    "PostalCode" nvarchar (10) NULL , 
    "Country" nvarchar (15) NULL , 
    "HomePhone" nvarchar (24) NULL , 
    "Extension" nvarchar (4) NULL , 
    "Photo" "image" NULL , 
    "Notes" "ntext" NULL , 
    "ReportsTo" "int" NULL , 
    "PhotoPath" nvarchar (255) NULL , 
    CONSTRAINT "PK_Employees" PRIMARY KEY CLUSTERED 
    (
     "EmployeeID" 
    ), 
    CONSTRAINT "FK_Employees_Employees" FOREIGN KEY 
    (
     "ReportsTo" 
    ) REFERENCES "dbo"."Employees" (
     "EmployeeID" 
    ), 
    CONSTRAINT "CK_Birthdate" CHECK (BirthDate < getdate()) 
) 
GO 
CREATE INDEX "LastName" ON "dbo"."Employees"("LastName") 
GO 
CREATE INDEX "PostalCode" ON "dbo"."Employees"("PostalCode") 
GO 


set quoted_identifier on 
go 
set identity_insert "Employees" on 
go 
ALTER TABLE "Employees" NOCHECK CONSTRAINT ALL 
go 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(1,'Davolio','Nancy','Sales Representative','Ms.','12/08/1948','05/01/1992','507 - 20th Ave. E. 
Apt. 2A','Seattle','WA','98122','USA','(206) 555-9857','5467',null,'Education includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International.',2,'http://accweb/emmployees/davolio.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(2,'Fuller','Andrew','Vice President, Sales','Dr.','02/19/1952','08/14/1992','908 W. Capital Way','Tacoma','WA','98401','USA','(206) 555-9482','3457',null,'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981. He is fluent in French and Italian and reads German. He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993. Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',NULL,'http://accweb/emmployees/fuller.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(3,'Leverling','Janet','Sales Representative','Ms.','08/30/1963','04/01/1992','722 Moss Bay Blvd.','Kirkland','WA','98033','USA','(206) 555-3412','3355',null,'Janet has a BS degree in chemistry from Boston College (1984). She has also completed a certificate program in food retailing management. Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',2,'http://accweb/emmployees/leverling.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(4,'Peacock','Margaret','Sales Representative','Mrs.','09/19/1937','05/03/1993','4110 Old Redmond Rd.','Redmond','WA','98052','USA','(206) 555-8122','5176',null,'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American Institute of Culinary Arts (1966). She was assigned to the London office temporarily from July through November 1992.',2,'http://accweb/emmployees/peacock.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(5,'Buchanan','Steven','Sales Manager','Mr.','03/04/1955','10/17/1993','14 Garrett Hill','London',NULL,'SW1 8JR','UK','(71) 555-4848','3453',null,'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976. Upon joining the company as a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent post in London. He was promoted to sales manager in March 1993. Mr. Buchanan has completed the courses "Successful Telemarketing" and "International Sales Management." He is fluent in French.',2,'http://accweb/emmployees/buchanan.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(6,'Suyama','Michael','Sales Representative','Mr.','07/02/1963','10/17/1993','Coventry House 
Miner Rd.','London',NULL,'EC2 7JR','UK','(71) 555-7773','428',null,'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles (MBA, marketing, 1986). He has also taken the courses "Multi-Cultural Selling" and "Time Management for the Sales Professional." He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',5,'http://accweb/emmployees/davolio.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(7,'King','Robert','Sales Representative','Mr.','05/29/1960','01/02/1994','Edgeham Hollow 
Winchester Way','London',NULL,'RG1 9SP','UK','(71) 555-5598','465',null,'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the University of Michigan in 1992, the year he joined the company. After completing a course entitled "Selling in Europe," he was transferred to the London office in March 1993.',5,'http://accweb/emmployees/davolio.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(8,'Callahan','Laura','Inside Sales Coordinator','Ms.','01/09/1958','03/05/1994','4726 - 11th Ave. N.E.','Seattle','WA','98105','USA','(206) 555-1189','2344',null,'Laura received a BA in psychology from the University of Washington. She has also completed a course in business French. She reads and writes French.',2,'http://accweb/emmployees/davolio.bmp') 
GO 
INSERT "Employees"("EmployeeID","LastName","FirstName","Title","TitleOfCourtesy","BirthDate","HireDate","Address","City","Region","PostalCode","Country","HomePhone","Extension","Photo","Notes","ReportsTo","PhotoPath") VALUES(9,'Dodsworth','Anne','Sales Representative','Ms.','01/27/1966','11/15/1994','7 Houndstooth Rd.','London',NULL,'WG2 7LT','UK','(71) 555-4444','452',null,'Anne has a BA degree in English from St. Lawrence College. She is fluent in French and German.',5,'http://accweb/emmployees/davolio.bmp') 
go 
set identity_insert "Employees" off 
go 
ALTER TABLE "Employees" CHECK CONSTRAINT ALL 
go 
set quoted_identifier on 
go 


Select * from "Employees" 

Answer 1

それは我々がそれを打破する場合、我々は試合のための譲渡禁止の条件がFirstName OR LastNameマッチのどちらかということであることを確認することができ、あなたの一致ルールを少し分析するために、おそらく便利です。それでは、私たちは、従業員テーブルからの行のみに参加クエリを作成してみましょう：

... 
FROM @holder As h 
JOIN Employee As e 
    ON h.FirstName = e.FirstName 
    OR h.LastName = e.LastName 
... 

は、今、私たちは最低限の基準を満たした行を見ていることを、私たちは他人を評価することができます。基本的にはあなたのルールは、どちらかFirstNameまたはLastName一致するならば、我々は（我々はFirstNameと一致したことを想定してみましょう）、以下の3の最小値が必要であることを述べている：

• マッチLastName
• マッチCity AND State、OR PostalCode
• マッチHomePhone
• マッチExtension

FirstNameとLastNameの両方が一致するかどうかによって異なるルールが表示されますが、そのうちの1つがある限り、ルールは数学的には私が取っている観点と同等です。

私たちは潜在的に一致する行を取り、一致する属性がいくつあるかを数え、不十分な行をフィルタリングすることができます。

Select h.holderidentitykey, e.* 
    From @holder As h 
    Join Employees As e 
    On h.FirstName = e.FirstName 
    Or h.lastname = e.LastName 
    Where iif(h.firstname = e.firstname, 1, 0) + 
     iif(h.lastname = e.LastName, 1, 0) + 
     iif((h.city = e.City AND h.stateabbr = e.Region) OR h.zip = e.PostalCode, 1, 0) + 
     iif(h.homephone = e.HomePhone, 1, 0) + 
     iif(h.extension = e.Extension, 1, 0) >= 4; 

は、このアプローチは、あなたが大きなテーブル（1M +）を持っている場合はうまくスケールと頻繁にマッチさせたいが、これらの状況が、その後発生したとき/場合は、リファクタリングを見て可能性がない場合がありますのでご了承ください。