SQL

External Tables

In Oracle SQL, external tables provide a way to query data stored outside the database in a flat file. These files can be in various formats such as CSV, text, or XML. External tables allow you to treat external data files as if they were database tables, making it easy to integrate external data into

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INDEX

Syntax Types of Indexes By creating an index on the LastName column, the database can efficiently find the rows with the specified last name, resulting in faster query performance. Example 2: Creating Index on 1 column Creating Index on 2 columns

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