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Detailed information on rules and restrictions

巴扎黑
Release: 2017-06-10 17:22:57
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View introduction requires MySQL 5 MySQL 5 adds support for views. Therefore, the contents of this chapter apply to MySQL 5 and later versions. Views are virtual tables. Unlike tables that contain data, views only contain queries that dynamically retrieve the data when used. The best way to understand the view is to look at an example: Input: select cust_name , cust_contact from customers, orders, orderitems where customers.cust_id = orders.cust_id and orderutems.order_num = order.orders.order_num and prod_id = 'TNT2'; this query Used to retrieve customers who have ordered a specific product. Anyone who needs this

1. Introduction to mysql views and why they are used and their rules and limitations

Detailed information on rules and restrictions

##Introduction: Requires MySQL 5 MySQL 5 adds support for views. Therefore, the contents of this chapter apply to MySQL 5 and later versions. Views are virtual tables. Unlike tables that contain data, views only contain queries that dynamically retrieve the data when used. The best way to understand views is to look at an example:

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