Effectively create and manage complex databases with Oracle! Systems and database expert Kevin Owens explores PL/SQL, Oracle's answer to the Structured Query Language (SQL), and teaches you what you need to know to build robust and complex databases
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Features • Write Protect Pin for Hardware Data Protection – Utilizes Different Array Protection Compared to the AT24C02/04/08/16 • Low-voltage and Standard-voltage Operation – 2.7 (VCC= 2.7V to 5.5V) – 1.8 (VCC= 1.8V to 5.5V) • Internally Organized
以前用Sql Server只会对图形界面进行操作,现在发现自己的Sql语言功底是越来越差了,例如如何为两个表添加关联,让他们级联更新和级联 删除。 到晚上查了一下,发现可以用两种办法 触发器方式: create trigger trg_A on A for update,delete as begin if exists(select 1 from inserted) update B set Name=(select Name from inserted) where Name=(selec