Question

我在我的sql过程中编写两个查询，以根据我的asp.net应用程序中用户提供的参数检索数据。

IF @Action = 'ID'
  SELECT Name,FirstName,LastName,Employee_ID,Location FROM Salary WHERE  Employee_ID=@Employee_ID
ELSE IF @Action = 'LASTNAME'
  SELECT Name,FirstName,LastName,Employee_ID,Location FROM Salary WHERE LastName  like '%' + @LastName + '%'

现在我想要的是将查询组合成单个查询，这样无论ID是作为参数传递还是传递姓氏，我都必须能够获取数据。

非常感谢任何帮助。提前致谢。

Answer 1

如果所有参数可以一起使用：

SELECT Name,FirstName,LastName,Employee_ID,Location FROM Salary 
WHERE Employee_ID=@Employee_ID or LastName  like '%' + @LastName + '%';

一个参数 - 一个电话：

SELECT Name,FirstName,LastName,Employee_ID,Location FROM Salary 
WHERE (@Employee_ID is not null and Employee_ID=@Employee_ID)
   or (@Employee_ID is null and LastName  like '%' + @LastName + '%')

Answer 2

试试这个 -

SELECT 
      Name
    , FirstName
    , LastName
    , Employee_ID
    , Location 
FROM dbo.Salary 
WHERE Employee_ID = ISNULL(@Employee_ID, Employee_ID)
    OR LastName  LIKE '%' + @LastName + '%'

Answer 3

SELECT Name,FirstName,LastName,Employee_ID,Location 
FROM Salary 
WHERE  (@Action = 'ID'       AND Employee_ID  = @Employee_ID)
OR     (@Action = 'LASTNAME' AND LastName  like '%' + @LastName + '%')

Answer 4

这解决了我的问题

SELECT Name, FirstName, LastName, Employee_ID, Location FROM Salary
WHERE Employee_ID = ISNULL(@Employee_ID, Employee_ID) and LastName  LIKE '%' + 
ISNULL(@LastName,LastName) + '%'

SQL Query通过组合两个查询来检索数据

4 个答案: