Sql Preventing Divide By Zero

  1 ALTER PROCEDURE links_GetAllLinks
2 @startRowIndex INT,
3 @maximumRows INT,
4 @sortExpression nvarchar(50)
5 AS
6
7
8
9
10
11 SET @startRowIndex = @startRowIndex + 1
12 --SELECT @TopicsFrom = CASE @TopicsDays WHEN '1' THEN DATEADD(day,-1,getdate()) WHEN '2' THEN DATEADD(day,-7,getdate()) WHEN '3' THEN DATEADD(day,-14,getdate()) WHEN '4' THEN DATEADD(month,-1,getdate()) WHEN '5' THEN DATEADD(month,-3,getdate()) WHEN '6' THEN DATEADD(month,-6,getdate()) WHEN '7' THEN DATEADD(year,-1,getdate()) ELSE DATEADD(year,-1,getdate()) END
13 -- populate the table CAST(getdate() as int)
14
15
16 IF @sortExpression LIKE ''
17 BEGIN
18 SET @sortExpression = 'links_Links.link_date'
19 END
20 DECLARE @sql nvarchar(4000)
21 SET @sql = 'Declare @Links TABLE
22 (RowNumber INT,
23 link_id INT,
24 cat_id INT,
25 cat_title VARCHAR(100),
26 sub_id INT,
27 sub_name VARCHAR(100),
28 link_aproved BIT,
29 link_name VARCHAR(100),
30 link_url varchar(100),
31 link_desc varchar(500),
32 link_date datetime,
33 link_rating INT,
34 link_ratingscount INT,
35 link_ratingvalue INT,
36 link_poster uniqueidentifier,
37 link_comments INT,
38 hit_date datetime);INSERT INTO @Links
39 SELECT ROW_NUMBER() OVER (ORDER BY ' + @sortExpression + '), links_Links.link_id, links_Links.cat_id, links_Categories.cat_title, links_Links.sub_id, links_SubCategories.sub_name, links_Links.link_aproved, links_Links.link_name, links_Links.link_url, links_Links.link_desc, links_Links.link_date, links_Links.link_rating, links_Links.link_ratingscount, (links_Links.link_rating/links_Links.link_ratingscount) as link_ratingvalue, links_Links.link_poster, links_Links.link_comments, links_Links.hit_date
40 FROM links_Links INNER JOIN
41 links_Categories ON links_Categories.cat_id = links_Links.cat_id INNER JOIN
42 links_SubCategories ON links_SubCategories.sub_id = links_Links.sub_id
43 WHERE links_Links.link_aproved = 1;SELECT * from @Links
44 WHERE RowNumber BETWEEN ' + CONVERT(nvarchar(10), @startRowIndex) + ' AND (' + CONVERT(nvarchar(10), @startRowIndex) + ' + ' + CONVERT(nvarchar(10), @maximumRows) + ') - 1'
45
46
47
48 EXEC sp_executesql @sql
49
50
51 RETURN at row 39, i define a field by dividing to values. I use these for ratings (finding the mean). The problem is, when a new link is submited, it has no ratings, so it performs a divide by zero. how do I check if the column "link_ratingscount" is zero? if it is, then return a zero, and if it is not zero, then do the divide?