sql MS SQL ANSI-Standard与非ANSI内部联接

Posted 2021-05-13

-- Sample code using the AdventureWorks2017 DB

-- ANSI-Standard Inner Join
SELECT TOP 5
       P.ProductID,
       P.Name,
       P.ListPrice,
       SOD.LineTotal
FROM Sales.SalesOrderDetail SOD
    [Inner] JOIN Production.Product P   
    -- The 'Inner' Is Optional
        ON P.ProductID = SOD.ProductID
WHERE SOD.UnitPrice > 1000
ORDER BY SOD.UnitPrice DESC;

-- non-ANSI / Old Style Inner Join
SELECT TOP 5
       P.ProductID,
       P.Name,
       P.ListPrice,
       SOD.LineTotal
FROM Sales.SalesOrderDetail SOD,
     Production.Product P
WHERE P.ProductID = SOD.ProductID
      AND SOD.UnitPrice > 1000
ORDER BY SOD.UnitPrice DESC;