Question

目标：我想总共查询三个表并分别显示每一行。

我只需要显示来自TblA和TblF的结果，因为TblProperty是父表，所以虽然我们可能使用它搜索但我不需要它的数据。

即。用户可能搜索邮政编码，但用户可能只搜索TblA中的评级。

我提供了两段代码。第一个是减少版本，我认为这可能有助于指导读者和我自己的解决方案。第二个代码是完整版。（我需要添加一些引号等等。但是在我主要部分工作后我正在测试我的时间）

要点： 如果我有一个来自TblA的结果和一个来自TblF的结果我想要两行数据而不是一行。

是：

SQL Server Management Studio 2012

查询：

我希望在这个阶段能看到一双新鲜的眼睛。也许我需要首先搜索两个表然后搜索属性或者查找创建临时表？

代码1：

USE DB

DECLARE @QUERY NVARCHAR(MAX)  = ''
DECLARE @QUERYSTRING NVARCHAR(MAX) = ''
DECLARE @sTypeOfUtility  NVARCHAR(MAX) = '2'

SET @QUERY = 
'SELECT 
p.ID AS ID,
p.UPRN AS UPRN, 
COALESCE(a.OverallRiskCategory,''0'') AS RiskType2, 
COALESCE(f.RiskRating,''0'') AS RiskType3, 
COALESCE(a.TypeOfUtility,'''') + COALESCE(f.TypeOfUtility,'''') AS TypeOfUtility
FROM TblProperty AS p'


SET @QUERY = @QUERY + ' INNER JOIN TblA AS a on  a.UPRN  = p.UPRN' 
SET @QUERY = @QUERY + ' INNER JOIN TblFAS f on  f.FIREUPRN =  p.UPRN'

IF @sTypeOfUtility = '2' 
SET @QUERYSTRING =    @QUERYSTRING  + ' AND a.TypeOfUtility LIKE ''%' +  LTRIM(RTRIM(@sTypeOfUtility)) + '%'''

IF @sTypeOfUtility  = '3' 
SET @QUERYSTRING =    @QUERYSTRING  + ' AND f.TypeOfUtility LIKE ''%' +  LTRIM(RTRIM(@sTypeOfUtility)) + '%'''

SET @QUERY = LTRIM(RTRIM(@QUERY)) + ' WHERE   1 = 1 ' +  LTRIM(RTRIM(@QUERYSTRING)) + '   ORDER BY typeofutility DESC'  

EXECUTE(@QUERY)

代码2（目前为止只有完整代码，但只有两个表格）：

USE [DB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================

ALTER PROCEDURE [dbo].[spGridSearch]

@sRiskRating NVARCHAR(50),@sUPRN NVARCHAR(20),
@sPostcode VARCHAR(20), @sPropertyName NVARCHAR(50) ,
@sStreet NVARCHAR(50), @sTypeOfUtility NVARCHAR(10),
@sDateFrom DATETIME, @sDateTo DATETIME 

AS
BEGIN

DECLARE @QUERY NVARCHAR(MAX)  = ''
DECLARE @QUERYSTRING NVARCHAR(MAX) = ''

SET @QUERY = 
'SELECT 
p.ID AS ID,
p.UPRN AS UPRN, 
COALESCE(a.OverallRiskCategory,''0'') AS OverallRiskCategory, 
COALESCE(a.TypeOfUtility,''0'') AS TypeOfUtility, 
COALESCE(a.SurveyDate,'''') AS SurveyDate, COALESCE(a.ItemRef, '''') AS ItemRef, 
COALESCE(a.NextSurveyDue,'''') AS NextSurveyDue ,
COALESCE(a.Recommendations,''NO DATA'') AS Recommendations, 
COALESCE(a.StatusOfIssue,''0'') As StatusOfIssue 
FROM TblProperty AS p '

SET @QUERY = @QUERY + ' LEFT JOIN TblA AS a on  p.UPRN = a.UPRN ' 

IF @sRiskRating <> '1234xyz'
SET @QUERYSTRING =    @QUERYSTRING  + ' AND a.OverallRiskCategory LIKE ''%' +  LTRIM(RTRIM(@sRiskRating)) + '%'''

IF @sTypeOfUtility <> '1234xyz'
SET @QUERYSTRING =    @QUERYSTRING  + ' AND a.TypeOfUtility LIKE ''%' +  LTRIM(RTRIM(@sTypeOfUtility)) + '%'''


--IF @sDateFROM <> '2050-01-01' AND  @sDateTO <> '2050-01-01'
--SET @QUERYSTRING =   @QUERYSTRING  + ' AND a.SurveyDate BETWEEN ' + @sDateFrom + ' AND ' + @sDateTo  

IF @sUPRN <> '1234xyz'
SET @QUERYSTRING =    @QUERYSTRING  + ' AND p.UPRN LIKE ''%' +  LTRIM(RTRIM(@sUPRN)) + '%'''

IF @sPostcode <> '1234xyz'
SET @QUERYSTRING =    @QUERYSTRING  + ' AND p.Postcode LIKE ''%' +  LTRIM(RTRIM(@sPostcode)) + '%'''

IF @sPropertyName <> '1234xyz'
SET @QUERYSTRING =    @QUERYSTRING  + ' AND p.BuildingNo LIKE ''%' +  LTRIM(RTRIM(@sPropertyName)) + '%'''

IF @sStreet <> '1234xyz'
SET @QUERYSTRING =    @QUERYSTRING  + ' AND p.Street LIKE ''%' +  LTRIM(RTRIM(@sStreet)) + '%'''


IF LEN(LTRIM(RTRIM(@QUERYSTRING)))  > 5 
--Remove last as we dont need it
--SET @QUERYSTRING =  LEFT(@QUERYSTRING, NULLIF(LEN(@QUERYSTRING)-1,-1))

SET @QUERY = LTRIM(RTRIM(@QUERY)) + ' WHERE   1 = 1 ' +  LTRIM(RTRIM(@QUERYSTRING))   

EXECUTE(@QUERY) 

END

参考文献： http://support.sas.com/documentation/cdl/en/sqlproc/62086/HTML/default/viewer.htm#a001361784.htm http://www.w3schools.com/sql/sql_join.asp

Answer 1

正如我在评论中提到的，你应该使用UNION ALL语句来获取两个表的所有结果。这要求两个select都具有相同的列数，并且列应具有相同的数据类型你的查询基本上是这样的：

SELECT 
...
FROM TblProperty AS p
INNER JOIN TblA AS a on  a.UPRN  = p.UPRN

UNION ALL

SELECT 
...
FROM TblProperty AS p
INNER JOIN TblFAS f on  f.FIREUPRN =  p.UPRN

我还建议使用sp_executesql和命名参数，例如named parameters in sp_executesql

搜索多个数据库并在不同的行上显示结果

1 个答案: