Question

我有一个非常简单的表

ID| Category| Amount
------------------------
1 | Size 1  | 50000.00
2 | Size 2  | 100000.00
3 | Size 3  | 500000.00

当传递的金额小于或等于50000.00时，我想返回类别“大小1” 通过金额时“尺寸2”小于或等于100000.00但大于“尺寸1” 当传递的数量小于或等于500000.00但大于“尺寸2”时，“尺寸3”

这样做的一个显而易见的方法是简单地使用if条件，但这只是一个例子，可以有任意数量的类别。所以我不能硬编码。

Answer 1

请参阅以下代码

public class TesteStackOverflow
{
    public TesteStackOverflow(decimal amout)
    {
        List<testTable> list = new List<testTable>();
        list.Add(new testTable { Id = 1, Category = "Size 1", Amount = 50000 });
        list.Add(new testTable { Id = 2, Category = "Size 2", Amount = 100000 });
        list.Add(new testTable { Id = 3, Category = "Size 3", Amount = 500000 });


        var r = (from n in list where amout <= n.Amount select n).First();

        if(r != null)
            System.Diagnostics.Debug.Print(r.Category);
        else
            System.Diagnostics.Debug.Print("Category not found");

    }
}

public class testTable
{
    public int Id { get; set; }
    public string Category { get; set; }
    public decimal Amount { get; set; }
}

Answer 2

一种简单的方式......

SELECT CATEGORY
FROM YourTable
WHERE AMOUNT = (SELECT MAX(AMOUNT)
                FROM YourTable
                WHERE AMOUNT <= YourValue)

Answer 3

您可以将限制放在表格中，然后加入它。

Answer 4

像

这样的东西

SELECT  TOP 1 *
FROM    @Table
WHERe   Amount >= @Val
ORDER BY Amount

SQL Fiddle DEMO

Answer 5

if not exists(
SELECT  TOP 1 *
FROM    tbl_TicketSizeMst
WHERe   Amount >= @amt
ORDER BY Amount
)
begin
select top 1 * FROM  tbl_TicketSizeMst
end
else 
begin
SELECT  TOP 1 *
FROM    tbl_TicketSizeMst1
WHERe   Amount >= @amt
ORDER BY Amount
end

Answer 6

使用以下定义创建视图：

; WITH x AS (
  SELECT id
       , category
       , amount
       , Row_Number() OVER (ORDER BY amount) As sequence
  FROM   your_table
)
SELECT x.id
     , x.category
     , Coalesce(prev.amount, 0) As lower_amount
     , x.amount As upper_amount
FROM   x
 LEFT
  JOIN x As prev
    ON prev.sequence + 1 = x.sequence

此视图将返回如下结果集：

id category lower_amount upper_amount
-- -------- ------------ ------------
1  Size 1        0.00     50000.00
2  Size 2    50000.00    100000.00
3  Size 3   100000.00    500000.00

然后您可以像这样查询此视图：

SELECT category
FROM   that_view
WHERE  @your_value >  lower_amount
AND    @your_value <= upper_amount

Answer 7

告诉我哪些样本数据不起作用（失败的地方）

Declare @t table(ID int, Category varchar(50), Amount float)
insert into @t
select 1 , 'Size 1', 50000.00 union all
select 2 , 'Size 2' , 100000.00 union all
select 3 , 'Size 3'  , 500000.00

Declare @input float=50000


select id,category ,amount from @t a
where a.Amount-@input=(select  min(a.Amount-@input) from @t a where a.Amount-@input>=0 )

根据日期中的金额值获取类别在sql中

7 个答案:

SQL Fiddle DEMO