多种联结语句

 



-----内联结3个表返回产品的折扣信息-----





SELECT p.Name,s.DiscountPct from Sales.SpecialOffer s



inner JOIN Sales.SpecialOfferProduct o ON



s.SpecialOfferID=o.SpecialOfferID



INNER JOIN Production.Product p ON



o.ProductID=p.ProductID



WHERE p.Name ='All-Purpose Bike Stand'





-----外联结2个表返回税率状态、省-----



SELECT s.CountryRegionCode,s.StateProvinceCode,t.TaxType,t.TaxRate FROM Person.StateProvince s



LEFT OUTER JOIN Sales.SalesTaxRate t ON



s.StateProvinceID=t.StateProvinceID



-----比较内联结-----

SELECT s.CountryRegionCode,s.StateProvinceCode,t.TaxType,t.TaxRate FROM Person.StateProvince s



INNER JOIN Sales.SalesTaxRate t ON



s.StateProvinceID=t.StateProvinceID





-----交叉联结-----



SELECT s.CountryRegionCode,s.StateProvinceCode,t.TaxType,t.TaxRate FROM Person.StateProvince s



CROSS JOIN Sales.SalesTaxRate t





-----实现自联结-----



SELECT e.EmployeeID,e.Title,m.Title AS ManagerTitle



from HumanResources.Employee e



LEFT OUTER JOIN HumanResources.Employee m ON

e.ManagerID = m.EmployeeID



-----使用衍生表------



SELECT DISTINCT s.PurchaseOrderNumber

FROM Sales.SalesOrderHeader s

INNER JOIN (SELECT SalesOrderID

FROM Sales.SalesOrderDetail

WHERE UnitPrice BETWEEN 1000 AND 2000) d ON

s.SalesOrderID=d.SalesOrderID







-----使用 UNION 组合结果集-----



SELECT SalesPersonID,GETDATE() QuotaDate,SalesQuota

FROM Sales.SalesPerson

WHERE SalesQuota>0

UNION 

SELECT SalesPersonID,QuotaDate,SalesQuota

FROM Sales.SalesPersonQuotaHistory

WHERE SalesQuota>0

ORDER BY SalesPersonID DESC,QuotaDate DESC