Question

我正在尝试创建以下功能：

CREATE FUNCTION fn_WarrantyTrend
returns @myTable table
(
    Years int 
)
AS
BEGIN
    insert into @myTable
    SELECT distinct YEAR(CurDate) from EOD_Main ORDER BY YEAR(CurDate) ASC
    RETURN 
END

我收到了这些错误：

Msg 102，Level 15，State 1，Procedure fn_WarrantyTrend，Line 2
'return'附近的语法不正确。
消息1087，第15级，状态2，程序fn_WarrantyTrend，第8行
必须声明表变量“@myTable”。

Answer 1

如果从您编写的语法中收到错误，则应consult the documentation：

CREATE FUNCTION dbo.fn_WarrantyTrend -- always use schema prefix
(
    @Years int -- need @variable syntax here
)
-- parameter list comes *before* RETURNS
RETURNS TABLE -- you should use an inline table-valued function when possible
AS
  RETURN 
  (
    SELECT DISTINCT CurDate = YEAR(CurDate) -- should alias the output column
      FROM dbo.EOD_Main -- again, always use SCHEMA prefix
      --ORDER BY YEAR(CurDate) ASC -- not possible to ORDER BY here without TOP
          -- the outer query that calls the function should apply any ORDER BY
  );

但有趣的是，您使用此@Years参数，并且从不使用它...

您还应该考虑创建函数WITH SCHEMABINDING。并here is background on always using the schema prefix。

尝试编译函数的语法不正确

1 个答案: