存储过程出现错误.

ALTER PROCEDURE [getArticles]
@startRowIndex int,
@maximumRows int,
@categoryID int,
@totalRows int output
AS

DECLARE @first_id int,@startRow int

SET @startRowIndex = (@startRowIndex-1)*@maximumRows

IF @startRowIndex = 0
SET @startRowIndex = 1

SET ROWCOUNT @startRowIndex
SELECT @first_id = ID FROM article where categoryID=@categoryID ORDER BY ID
PRINT @first_id
SET ROWCOUNT @maximumRows

SELECT * FROM [article] WHERE ID>=@first_id and categoryID=@categoryID ORDER BY ID

SET ROWCOUNT 0

SELECT @totalRows = COUNT(ID) FROM [article] where categoryID = @categoryID //错误计算表[article]中categoryID = @categoryID的数据条数.错误提示GO附近有错误.
GO

另外如果我要用到 like:
若有参数keyword为null 则不用like 怎么修改此存储过程?
where (title like @keyword)

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