城院數(shù)據(jù)庫系統(tǒng)原理實驗(共9頁)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上分別用相關(guān)子查詢和不相關(guān)子查詢,查詢沒有生成過訂單的員工姓名.select LastName,FirstNamefrom Employeeswhere not exists(select *from Orderswhere Employees.EmployeeID=EmployeeID)select LastName,FirstNamefrom Employeeswhere EmployeeID in(select EmployeeIDfrom Orderswhere Employees.EmployeeID<>Orders.EmployeeID)查詢自己

2、下級生成的訂單數(shù)量最多的員工.(注:每個下級員工的訂單數(shù)和最多)select employeeidfrom Employeeswhere employeeid in(select employeeidfrom ordersgroup by employeeid having count(orderid)>=all(select count(orderid) from ordersgroup by employeeid)and reportsto is not null查詢訂單最多的城市名稱。select shipcityfrom Ordersgroup by shipcity havin

3、g count(orderid)>=all(select count(orderid) from Ordersgroup by shipcity)查詢訂單數(shù)量最多的產(chǎn)品的供應(yīng)商select companyname from supplierswhere supplierid in(select supplierid from productswhere productid in(select productidfrom orderdetailsgroup by productid having count(orderid)>=all(select count(orderid)fro

4、m orderdetailsgroup by productid)查詢訂單金額最高的員工姓名select LastName,FirstNamefrom Employeeswhere employeeid in(select employeeidfrom orderswhere orderid in(select orderid from orderdetailswhere quantity*Unitprice=(select max(quantity*Unitprice)from orderdetails)查詢產(chǎn)品種類數(shù)最多的供應(yīng)商名稱select supplierid from produc

5、tsgroup by supplierid having count(productid)>=all(select count(distinct productid) from productsgroup by supplierid)將訂單數(shù)最多的員工的備注信息改為”優(yōu)秀員工”update employeesset notes='優(yōu)秀員工'where employeeid in(select employeeid from ordersgroup by employeeid having count(orderid)>=all(select count(orderi

6、d) from orders group by employeeid)通過一個SQL語句建立表,字段包括產(chǎn)品ID,產(chǎn)品名稱,訂單中產(chǎn)品總量(其中產(chǎn)品ID為主碼),并通過一個SQL語句填充這張表.insert into chanpinselect ductid,ductname,count(quantity)from OrderDetails b,products awhere ductid=ductidgroup by ductid,ductname在員工表中找一個員工,刪除這個員工相關(guān)的所有數(shù)據(jù)(多個SQL語句)select * from employeesselect * from orders where employeeid=8delete from employees where employeeid=8;delete from orders where employee