How to write nested cursor in pl sql

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There is an alternative method of handling cursors. It is called the cursor FOR loop because of the simplified syntax that is used. When using the cursor FOR loop, the process of opening, fetching, and closing is handled implicitly. This makes the blocks much simpler to code and easier to maintain. The cursor FOR loop specifies a sequence of statements to be repeated once for each row returned by the cursor.
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Cursor Expressions in PL/SQL

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Declaring a Cursor within a Procedure : Cursor Declaration « Cursor « Oracle PL/SQL Tutorial

It allows declaration of constants and variables , procedures and functions, types and variables of those types, and triggers. It can handle exceptions run-time errors. Implementations from version 8 of Oracle Database onwards have included features associated with object-orientation. These keywords divide the block into a declarative part, an executable part, and an exception-handling part. The declaration section is optional and may be used to define and initialize constants and variables.
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The internal structure of how the above SQL data resides is shown in the below table. The Ref-Cursor result of the employee ID s : The Ref-Cursor result of the employee ID s : , The Ref-Cursor result of the employee ID s : , , , , ,
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Cursors can be used in many applications where data is processed sequentially; for example, migrating data from a legacy system to an Oracle database or loading data into a data warehouse. For instance, a company might need to build a data warehouse where it can process information about marketing, inventory, and customers to understand the market potential and improve its sales. To populate the data warehouse, the company would have to upload the information from all the different data sources into a temporary set of tables on a regular basis.
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