沒有重複值

Question

我的問題是我想要插入值而不重複值。

ALTER PROCEDURE [dbo].[SD_Sproc_Result] 
    -- Add the parameters for the stored procedure here 
     @employeeid varchar(100), 
     @providercode varchar(100) 

AS 
BEGIN 

     Insert into TR_employeesprovidercode (employeeid, providercode) values 
     (@employeeid, @providercode) 

END 

Answer 1

試試這個：

IF NOT EXISTS(SELECT * FROM TR_employeesprovidercode 
        WHERE employeeid = @employeeid 
        AND providercode = @providercode) 
BEGIN 
     Insert into TR_employeesprovidercode (employeeid, providercode) 
     values (@employeeid, @providercode) 
END 

或者，您可以創建包含兩列的表的唯一約束僱員和providercode。

ALTER TABLE myTable 
ADD UNIQUE (employeeid, providercode); 

Answer 2

您需要定義一些領域unique和使用INSERT IGNORE...

http://dev.mysql.com/doc/refman/5.5/en/insert.html

閱讀有關IGNORE關鍵字。

http://dev.mysql.com/doc/refman/5.0/en/constraint-primary-key.html

閱讀關於unique-keys。