SQL语句作业,看不懂答:declare @kexue varchar(10),@round varchar(20), @str varchar(20), @cast nvarchar(50)select @kexue = CHARINDEX('科学','计算机科学与技术专业'), @round = ROUND(26.213+124.1869,2),str = STR(234.5678,6,2),@cast = '25+12='+CAST(37 AS NVARCHAR)print '第一个查询结果...