sql - 在存储过程 ms sql 中转换

Question

我有选择和过滤数据的存储过程。例如 ：

select CONVERT(nvarchar,[Date],120) , [FirstName] , [LastName]
FROM myDB
WHERE  (@Date IS NULL OR @Date = '' OR [Date] = @Date)
       (@FirstName IS NULL OR @FirstName  = '' OR [FirstName] = @FirstName)
       (@LastName IS NULL OR @LastName  = '' OR [LastName] = @LastName)

当我按名字或/和姓氏过滤时，它可以工作，但是当我想按数据过滤时它不起作用，我认为可能存在转换问题？我喜欢执行：

exec myProc '2013-02-03','',''

Answer 1

可能这对你有帮助-

SELECT 
      CONVERT(NVARCHAR,[Date],120) 
    , [FirstName] 
    , [LastName]
FROM myDB
WHERE ISNULL(@Date, [Date]) = [Date] --<--
    AND (ISNULL(@FirstName, '') = '' OR [FirstName] = @FirstName) 
    AND (ISNULL(@LastName, '') = '' OR [LastName] = @LastName)