Oracle Sql开发人员如何显示空的外键

我在做Oracle数据库项目，名为“Theatre booking system”。我想通过Customer_Concession和Member_Concession显示折扣价格。可以使用的外键是Ticket表中的bookingId，cconcessionId和mconcessionId。我想要显示所有票证，即使其中一个id不存在。如何编写SQL？你能帮我吗？谢谢。Oracle Sql开发人员如何显示空的外键

SELECT t.ticketId, pro.name "Production name", PRICE.LEVELID "Price level", 
Price.price "Price", (Price.price - ccons.discountPrice - mcons.discountPrice) 
"Discounted Price", t.seatNo "Seat", t.rowNo "Row", t.block "Block", 
per.performance_date "Performance date", per.start_time "Start time", 
per.end_time "End time", t.availability "Availability" 

FROM Ticket t, Production pro, Performance per, Price, Price_level, 
Booking, Customer, Customer_Concession ccons, Member_concession mcons 

WHERE t.performanceid = per.performanceid AND 
    t.PRODUCTIONID = Price.PRODUCTIONID AND 
    t.levelId = Price.levelId AND 
    Price.PRODUCTIONID = pro.PRODUCTIONID AND 
    Price.levelId = Price_level.levelId AND 
    t.bookingId = Booking.bookingId AND 
    Booking.customerId = Customer.customerId AND 
    ccons.cconcessionId = t.cconcessionId AND 
    mcons.mconcessionId = t.mconcessionId 

ORDER BY t.ticketId

来源

2012-03-26 wholee1

你在找什么叫做LEFT OUTER JOIN。

更多信息，请访问这个网站：http://www.oreillynet.com/network/2002/04/23/fulljoin.html

来源

2012-03-26 20:09:03

Oh..it很容易解决！谢谢！ – wholee1 2012-03-26 20:28:37

尝试...

WHERE t.performanceid = per.performanceid AND 
     t.PRODUCTIONID = Price.PRODUCTIONID AND 
     t.levelId = Price.levelId AND 
     Price.PRODUCTIONID = pro.PRODUCTIONID AND 
     Price.levelId = Price_level.levelId AND 
     t.bookingId = Booking.bookingId(+) AND 
     Booking.customerId = Customer.customerId(+) AND 
     ccons.cconcessionId(+) = t.cconcessionId AND 
     mcons.mconcessionId(+) = t.mconcessionId

（注意旧的语法）

来源

2012-03-26 20:26:55 cagcowboy

谢谢队友！我解决了它！ :) – wholee1 2012-03-26 20:34:30

Oracle Sql开发人员如何显示空的外键

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