用户在其中输入名称的文本框，可以是名字或姓氏，或同时输入名字和姓氏，然后在屏幕上显示记录数据。存储过程逻辑失败

Question

i have a text box where user enters name can be first name,last name or both.This all is entered in a single user input text box.Then the sql stored procedure should search for name(first,name,last name) can even be multiple records where the user can select a specific name from repetitive name in a popup or a simple table. I am don't have much skills in sql server.I am having problems getting the logic right.

The code till now is as follows-

create PROCEDURE [dbo].[getfullnamereturnTest]
@NameSearch nvarchar(max)
AS

begin

   if exists (select * from testingtable where firstname='@NameSearch') 
begin
select distinct testingtable.firstname,testingtable.lastname,testingtable.country  from testingtable inner join
(
select testingtable.firstname,COUNT(*) as repitingnamesno
from testingtable
where testingtable.firstname ='@NameSearch'
group by testingtable.firstname
having count(testingtable.firstname)>1)
subq ON testingtable.firstname = subq.firstname
end
else if exists (select * from testingtable where lastname='@NameSearch')
begin
select distinct testingtable.firstname,testingtable.lastname,testingtable.country  from testingtable inner join
(
select testingtable.lastname,COUNT(*) as repitingnamesno
from testingtable
where testingtable.lastname ='@NameSearch'
group by testingtable.lastname
having count (testingtable.lastname)>1 )
subq ON testingtable.lastname = subq.lastname
end

else
begin
select distinct testingtable.firstname,testingtable.lastname,testingtable.country  from testingtable inner join
(
select testingtable.firstname,testingtable.lastname,COUNT(*) as repitingnamesno
from testingtable
where testingtable.firstname+testingtable.lastname ='@NameSearch'
group by testingtable.firstname,testingtable.lastname
having count (testingtable.firstname+testingtable.lastname)>1 ) 
subq ON testingtable.firstname = subq.firstname AND testingtable.lastname = subq.lastname
end
end
go

Searching for last name with 'reddy'

exec getfullnamereturnTest @NameSearch='reddy'

The stored procedure returns empty table.Even when it consists of multiple records on name.But when i just executed the query without input parameter as below and it works fine.

 if exists (select * from testingtable where firstname='reddy') 
begin
select distinct testingtable.firstname,testingtable.lastname,testingtable.country  from testingtable inner join
(
select testingtable.firstname,COUNT(*) as repitingnamesno
from testingtable
where testingtable.firstname ='reddy'
group by testingtable.firstname
having count(testingtable.firstname)>1)
subq ON testingtable.firstname = subq.firstname
end
else if exists (select * from testingtable where lastname='reddy')
begin
select distinct testingtable.firstname,testingtable.lastname,testingtable.country  from testingtable inner join
(
select testingtable.lastname,COUNT(*) as repitingnamesno
from testingtable
where testingtable.lastname ='reddy'
group by testingtable.lastname
having count (testingtable.lastname)>1 )
subq ON testingtable.lastname = subq.lastname
end

else
begin
select distinct testingtable.firstname,testingtable.lastname,testingtable.country  from testingtable inner join
(
select testingtable.firstname,testingtable.lastname,COUNT(*) as repitingnamesno
from testingtable
where testingtable.firstname+testingtable.lastname ='reddy'
group by testingtable.firstname,testingtable.lastname
having count (testingtable.firstname+testingtable.lastname)>1 ) 
subq ON testingtable.firstname = subq.firstname AND testingtable.lastname = subq.lastname
end

It returns output as below: enter image description here

The table consists of the following values. enter image description here

Table data-

CREATE TABLE [dbo].[testingtable](  [firstname] [nvarchar](50) NULL,    [lastname] [nvarchar](50) NULL,     [country] [nvarchar](max) NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO

INSERT INTO testingtable (firstname, lastname, country) 
   VALUES ('sruthi','Yarramreddy' , 'IND'), 
          ('sruthi','chiluka' , 'US'),
          ('amulya', 'reddy', 'BZ'), 
          ('amulya', 'Choudary', 'Uk'),
          ('avasya', 'Koneru', 'US'),
           ('avasya', 'Koneru', 'AUS'),
          ('amulya', 'reddy', 'BZ'),
           ('avasya', 'Koneru', 'US'),
           ('sruthi','K' , 'AUS'),
           ('sruthi','yaramreddy' , 'AUS');

Answer 1

Not sure if this is really what you are after but here is my best guess.

select firstname, lastname, country
from testingtable
where firstname = @NameSearch
    OR lastname = @NameSearch

Also, Country should NOT be varchar(max). It should a char(2) or char(3) depending on which standard you are using. You seem to be mixing 2 and 3 character country codes. It should also be a foreign key to a Country table.

For querying basics the Stairways series on SQL Server Central is awesome. http://www.sqlservercentral.com/stairway/75773/