Thanks James and Tim,
I have used your coding and I now have the following:
SELECT
100.0*SUM(CAST(tbl1.Star AS tinyint))/Count(*) AS Perc,
tbl1.RecID,
Count(*) AS CountOfID,
SUM(CAST(tbl1.Star AS tinyint)) AS CountOfStar,
tbl2.RankID,
(CASE WHEN 100.0*SUM(CAST(tbl1.Star AS...