如何创建SQL Server函数以返回int？

Question

我正在尝试创建一个SQL函数,用于测试参数是以某个术语开头还是包含该术语,但不是以它开头.

基本上,如果参数以term开头,则函数返回0.否则返回1.

这是我所拥有的函数的骨骼,我正在尝试从我发现的另一个函数中进行调整:

CREATE FUNCTION [dbo].[fnGetRelevance] 
(   
    @fieldName nvarchar(50),
    @searchTerm nvarchar(50)
)

RETURNS @value int -- this is showing an error, it seems to expect table but all I want is an int
(
    -- does this need to be here? If so, what should it be?
)

AS

BEGIN

    declare @field TABLE(Data nvarchar(50))

    insert into @field
        select Data from @fieldName

    if (Data like @searchTerm + '%') -- starts with
    begin       
        return 0
    end
    else if (Data like '%' + @searchTerm + '%' and Data not like @searchTerm + '%') -- contains, but doesn't start with 
    begin       
        return 1
    end

END

GO

Answer 1

您不为返回值提供变量名称,只提供其类型,并且不需要parens;

CREATE FUNCTION [dbo].[fnGetRelevance] 
(   
    @fieldName nvarchar(50),
    @searchTerm nvarchar(50)
)

RETURNS int
AS
....

也;

select Data from @fieldName

如果不起作用,则需要动态SQL从名称中包含变量的对象中进行选择.