匹配2波。第二个“波”是基于第一个“波”

我有一个“匹配”的情况下，我需要匹配表中的记录。匹配2波。第二个“波”是基于第一个“波”

我已经改变了我的使用罗斯文数据库的情况..为了说明的目的。

给定一组“数据”（放在下面的@holder表中），我需要根据以下标准找到匹配项。

如果这两个姓氏和名字的比赛，比赛在两个或多个以下：（城邦聚会或邮编），电话，分机

如果在任姓或姓的比赛，比赛中的一个三个或更多的以下内容：（城邦聚会或邮编），电话，扩展

注意，“城邦在一起或ZIP”的意思，我需要匹配都市的组合和状态........或zip ..........如果所有三个匹配，（城市状态和zip），仍然应该只计为“1”为“（西umnCityStateZipEnum + ColumnHomePhoneEnum + ColumnExtensionEnum）“计算。

我想出了以下内容。但我有左连接。

是否有另一种方法在SQL中执行此类问题？

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

这是一个“部分”Northwind创造，如果你没有一个方便。

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"

来源

2016-11-16 granadaCoder

为了帮助我理解，提供的代码是否按照您的规则正确匹配？ – mendosi

是的，我用我的代码得到正确的结果。我正在寻找“解决问题的替代方法”。 – granadaCoder

这可能有助于分析您的匹配规则一点，如果我们打破它，我们可以看到，对于比赛的不可转让的条件是，要么FirstName或LastName匹配。因此，让我们创建一个查询，我们从员工表连接只有那些行：

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

现在我们只是在寻找符合最低标准的行，我们可以评估等。基本上，你的规则说，如果只将FirstName或LastName比赛，那么我们就需要最少三个以下的（让我们假设，我们匹配FirstName）：

比赛LastName
比赛City和State，或PostalCode
比赛HomePhone
比赛Extension

您提出了不同的规则，具体取决于如果FirstName和LastName匹配，但只要您有这两个中的一个，那么碰巧这些规则在数学上等同于我所采用的视角。

因此，我们可以将我们可能的匹配行计算在内，并只计算其中有多少匹配属性，并在没有足够的位置过滤出行。

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;

请注意，这种方法可能不能很好地扩展，如果你有大的表（1M +），并希望经常匹配，但是如果/当这些情况发生，然后你可以看看重构。

来源

2016-11-16 23:13:44 mendosi

感谢您的替代想法。我会把它扔进测试周期。但我会有大桌子。 – granadaCoder

@granadaCoder在这种情况下，我会尝试使用'FirstName'上匹配的所有行的'UNION'和那些匹配'Lastname'的行。 – mendosi

匹配2波。第二个“波”是基于第一个“波”

回答

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