Explain please

Questions is a tool for analyzing large pools of data. * 1 point Data warehousing O Answer not given O Data marts Data mining "Customer_phone_number" can be a primary key for a customer table. * 2 points True False For example you boss needs to know the total sales amonut in tangail 1 point region. Which SQL code is correct ? * select sum(sales amount) from sales O select sum(sales amount) from sales where region = "Tangail" O select sum(salesamount) from sales where region = "Tangail" O select sum(salesamount) from sales where region = Tangail None of the above