SQL去计算一位小数的问题

表字段为int类型

CASE WHEN MyRequiredPeriod IS NULL THEN '-' ELSE CAST(ROUND(MyRequiredPeriod/3600,1) AS NVARCHAR(50)) END,这样取出来的小数后面带0，怎样才让能让这个字段取得两位小数呢

 CASE WHEN MyRequiredPeriod IS NULL THEN '-' ELSE CAST(ROUND(MyRequiredPeriod/3600,2) AS NVARCHAR(50)) END

cast(13.145 as decimal(10, 2))

http://blog.itpub.net/22392018/year-201405-list-1/