SQL语句:select max(orderprice) from order
SQL语句:select sum(orderprice) from order
SQL语句:select avg(orderprice) from order
SQL语句:select ceiling(1.6) 向上取整函数
SQL语句:select floor(7.2) 向下取整函数
SQL语句:select round(123.456,2) 四舍五入函数
SQL语句:select power(2,3)
SQL语句:select pi()
SQL语句:select square(3)
SQL语句:select sqrt(9)
SQL语句:select exp(10)
SQL语句:select len("中华人民共和国")
SQL语句:select left('abcd',2)
SQL语句:select right('abcd',2)
SQL语句:select substring(‘abcdef’,3,2)
SQL语句:select lower(‘aBcd’)
SQL语句:select replicate(‘abcd’,2)
SQL语句:select stuff(‘abcdef’,3,2,‘qp’)
SQL语句:select trim(' aaa bbb ccc ')
SQL语句:select Ltrim(' aaa bbb ccc ')
SQL语句:select Rtrim(' aaa bbb ccc ')
SQL语句:select reverse(‘abcd’)
SQL语句:select charindex('a','cdad')
SQL语句:select str(123)