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The following is an Oracle syntax example of a row level trigger that is called AFTER an update FOR EACH ROW affected. This trigger is called on an update to a phone book database. When the trigger is called it adds an entry into a separate table named phone_book_audit.
Every refactoring to a database leaves the system in a working state, thus not causing maintenance lags, provided the meaningful data exists in the production environment. A database refactoring is conceptually more difficult than a code refactoring ; code refactorings only need to maintain behavioral semantics while database refactorings also ...
A table (called the referencing table) can refer to a column (or a group of columns) in another table (the referenced table) by using a foreign key.The referenced column(s) in the referenced table must be under a unique constraint, such as a primary key.
However, Oracle databases store schema objects logically within a tablespace of the database. The data of each object is physically contained in one or more of the tablespace's datafiles . For some objects (such as tables, indexes, and clusters) a database administrator can specify how much disk space the Oracle RDBMS allocates for the object ...
My husband and I separated, and I moved into an apartment near our family home. We wanted to prioritize keeping things stable for our three children.
Surrogate keys typically do not change while the row exists. This has the following advantages: Applications cannot lose their reference to a row in the database (since the identifier does not change). The primary or natural key data can always be modified, even with databases that do not support cascading updates across related foreign keys.
Penn State University is playing its first game in the College Football Playoff in just a few days and is facing a shakeup in the quarterback room thanks to the sport’s wide-open transfer rules.
Arizona authorities believe a man was lured out of his home to his death by a stranger seeking help with his car. Paul Clifford, 53, was found dead near a "smoldering vehicle" by Redington Pass in ...