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PL/SQL collections - Learn PL/SQL programming in simple and easy steps starting Both types of PL/SQL tables, i.e., the index-by tables and the nested tables 24 Nov 2016 This Oracle tutorial explains how to create, rename and drop indexes in by the optimizer to choose a "plan of execution" when SQL statements are executed. SQL Indexes - Learn SQL (Structured Programming Language) in simple and easy steps starting from basic to advanced concepts with examples including Lesson 6 Indexes, Part 1. A introduction to B-Tree indexes. Lesson Objectives. B-Tree Concepts. What are they? Why create them? How to create; Using the10 Aug 2017 Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, 13 Mar 2015 PLSQL stands for Procedural Language extensions to SQL, and is an Oracle Tutorial Indexes, Create, rename and drop indexes (performance tuning) Privileges Needed to Create Indexes. When using indexes in an application, you might need to request that the DBA grant privileges or make changes to Index in sql is created on existing tables to retrieve the rows quickly. When there are In Oracle there are two types of SQL index namely, implicit and explicit.