How to get one desire record by using WHERE and ORDER BY clause

Create “tblSetting” using following query

/****** Object:  Table [dbo].[tblSetting]    Script Date: 07/16/2013 11:43:49 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

SET ANSI_PADDING ON

GO

CREATE TABLE [dbo].[tblSetting](

      [ID] [int] IDENTITY(1,1) NOT NULL,

      [UniversityID] [int] NOT NULL,

      [CollegeID] [int] NOT NULL,

      [cItem] [varchar](50) NOT NULL,

      [cDescription] [varchar](200) NOT NULL,

      [cValue] [varchar](200) NOT NULL

CONSTRAINT [Pk_ID] PRIMARY KEY CLUSTERED

(

      [ID] ASC

)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]

) ON [PRIMARY]

GO

SET ANSI_PADDING OFF

GO

Get record according to College Level or university level or global level such that we get only one record

Conditions are

1. Get record according to college and University level i.e. where UniversityID AND CollegeID is non zero

2. Get record according to college level i.e. If 1st condition does not match then execute this where UniversityID is zero AND CollegeID is non zero

3. Get record according to University level i.e. If 1st, 2nd condition does not match then execute this where UniversityID is non zero AND CollegeID is zero

4. Get record according to global setting level i.e. If 1st, 2nd, 3rd condition does not match then execute this where both UniversityID AND CollegeID is zero

Get single record by using only one SELECT query.

I follow following way to get the desire result. Execute each condition one by one and check the result

Condition 4

Insert Following records where UniversityID AND CollegeID is zero

INSERT INTO dbo.tblSetting (UniversityID, CollegeID, cItem, cDescription, cValue) VALUES(0,0,'FileUploadPath','File Upload Path','\\XYZ\GlobalReports\')

SELECT TOP 1 * FROM tblSetting WHERE cItem = 'FileUploadPath' AND

(UniversityID = 177 OR UniversityID = 0) AND (CollegeID = 65 OR CollegeID = 0) ORDER BY CollegeID DESC , UniversityID DESC

Here our 1st, 2nd, 3rd conditions are not satisfied, however 4th condition is valid. So its output is

ID	UniversityID	CollegeID	cItem	cDescription	cValue
1	0	0	FileUploadPath	File Upload Path	\\XYZ\GlobalReports\

Condition 3

Insert Following records where UniversityID is non zero AND CollegeID is zero

INSERT INTO dbo.tblSetting (UniversityID, CollegeID, cItem, cDescription, cValue) VALUES(177,0,'FileUploadPath','File Upload Path','\\XYZ\UnivReports\')

SELECT TOP 1 * FROM tblSetting WHERE cItem = 'FileUploadPath' AND

(UniversityID = 177 OR UniversityID = 0) AND (CollegeID = 65 OR CollegeID = 0)ORDER BY CollegeID DESC , UniversityID DESC

Here 1st, 2nd, 4rd conditions are not satisfied, however 3rd condition is valid. So its output is

ID	UniversityID	CollegeID	cItem	cDescription	cValue
2	177	0	FileUploadPath	File Upload Path	\\XYZ\UnivReports\

Condition 2

Insert Following records where UniversityID is zero AND CollegeID is non zero

INSERT INTO dbo.tblSetting (UniversityID, CollegeID, cItem, cDescription, cValue) VALUES(0,65,'FileUploadPath','File Upload Path','\\XYZ\CollegeReports\')

SELECT TOP 1 * FROM tblSetting WHERE cItem = 'FileUploadPath' AND

(UniversityID = 177 OR UniversityID = 0) AND (CollegeID = 65 OR CollegeID = 0)ORDER BY CollegeID DESC , UniversityID DESC

Here our 1st, 3rd, 4th conditions are not satisfied, however 2th condition is valid. So its output is

ID	UniversityID	CollegeID	cItem	cDescription	cValue
3	0	65	FileUploadPath	File Upload Path	\\XYZ\CollegeReports\

Condition 4

Insert Following records where both UniversityID AND CollegeID is non zero

INSERT INTO dbo.tblSetting (UniversityID, CollegeID, cItem, cDescription, cValue) VALUES(177,65,'FileUploadPath','File Upload Path','\\XYZ\UnivCollegeReports\')

SELECT TOP 1 * FROM tblSetting WHERE cItem = 'FileUploadPath' AND

(UniversityID = 177 OR UniversityID = 0) AND (CollegeID = 65 OR CollegeID = 0)ORDER BY CollegeID DESC , UniversityID DESC

Here our 1st, 2nd, 3rd conditions are not satisfied, however 4th condition is valid. So its output is

ID	UniversityID	CollegeID	cItem	cDescription	cValue
4	177	65	FileUploadPath	File Upload Path	\\XYZ\UnivCollegeReports\

As you can analyze we are using same SELECT query for all output

SELECT TOP 1 * FROM tblSetting WHERE cItem = 'FileUploadPath' AND

(UniversityID = 177 OR UniversityID = 0) AND (CollegeID = 65 OR CollegeID = 0)ORDER BY CollegeID DESC , UniversityID DESC

I believe there are multiple ways of doing this in SQL Server. Let me know if you have any other way of achieving the desire result.

Please leave your comments / suggestion.