Titlebook: Beginning Oracle Programming; Sean Dillon,Christopher Beck,Howard Rogers Book 2002 Sean Dillon and Christopher Beck and Thomas Kyte and Jo

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客观

https://doi.org/10.1007/978-3-540-70605-2 view just as if you were accessing a normal table. You can select from it, join to it, and in some cases, you can INSERT, UPDATE, and DELETE from it. As such, a view can be considered a .. There are four types of views in Oracle:

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车床

https://doi.org/10.1007/978-3-658-02972-2. In Chapter 6, we looked at how Oracle helps you optimize your queries through the use of the Rule-and Cost-based optimizers. However, the optimizers can only suggest execution plans (in the case of the Cost-based optimizer on the basis of its own statistics), rather than optimize their actual execution. This is where tuning comes into play.

假装是你

The New 9, Sample Schemas,ng the trusty SCOTT schema for simple queries, updates, and deletes in order to learn, test, and/or tune their databases. These schemas are what we call .. Sample schemas are collections of database objects such as tables, views, and indexes, which come prepopulated with data representative of a small or medium-sized company.

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Procedures, Functions, and Packages, Well that is not the case at all. Developers can name their PL/SQL blocks, parameterize them, store them in the database and reference or run them from any database client or facility such as SQL*Plus, Pro*C, or even JDBC.

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Triggers, given no indication that Oracle is executing triggers, unless of course the trigger causes an error that the developer has not handled properly. In that case the event that caused the trigger to fire will fail.