-- 创建自定义函数,用语合并连接
CREATE FUNCTION f_book
(@id int)
RETURNS varchar
AS
BEGIN
DECLARE @book varchar(8000)
SET @book = ''
SELECT @book = @book + ',' + book FROM t2 WHERE id = @id
SET @book = SUBSTRING(@book,2,8000)
RETURN (@book)
END
GO-- 调用
SELECT id,name,dbo.f_book(id) book FROM t1
CREATE FUNCTION f_book
(@id int)
RETURNS varchar
AS
BEGIN
DECLARE @book varchar(8000)
SET @book = ''
SELECT @book = @book + ',' + book FROM t2 WHERE id = @id
SET @book = SUBSTRING(@book,2,8000)
RETURN (@book)
END
GO-- 调用
SELECT id,name,dbo.f_book(id) book FROM t1
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