Sql 具有可变条件和错误消息的存储过程

在我的过程中，变量@year应该采用两种形式：1：如果@year=1，选择所有年份。2:@Year=输入的年份

以下是我的代码示例：

CREATE PROC spProcName (@Year)
AS
BEGIN 
SELECT Year AS [YEAR], Item AS [ITEM]
FROM Sales
WHERE Year = @YEAR

我可以让它在@Year=2013年运行，但我不知道如何合并@Year=1来选择所有年份。我猜是凯斯

---

我还有许多其他类似的条件和其他变量，所以我不能只创建一个IF语句

约翰答案的替代方案，但准等效：

Where Year = Case when @Year = 1 Then Year else @Year end

WHERE (@year=1 OR year=@year)

---

在这种情况下，最好在查询结束时添加

选项（重新编译）

，否则，如果

年份

列中存在索引，则查询将无法选择索引。

@user107242乐意提供帮助。

--If you give value 1 it will select all the records from table year wise else if you give year like 2016 it fetches all the record based on given year
ALTER PROC spProcName (@Year int)
AS
BEGIN
  IF @Year = 1
  BEGIN
    SELECT
      [Year] AS [YEAR],
      Item AS [ITEM]
    FROM Sales
        ORDER BY [Year]
  END
  ELSE
    SELECT
      [Year] AS [YEAR],
      Item AS [ITEM]
    FROM Sales
        WHERE DATEPART(YEAR, CAST([Year] AS date)) = @year
END