How to write function inside declare block in plsql

A standalone function is a function a subprogram that returns a single value that is stored in the database. The call specification tells the database which Java method, or which named function in which shared library, to invoke when an invocation is made. It also tells the database what type conversions to make for the arguments and return value. Oracle Database Java Developer's Guide. Users who were granted privileges on the function before it was redefined can still access the function without being regranted the privileges.
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PL/SQL - DBMS Output - Tutorialspoint

The exceptions can have different causes such as coding mistakes, bugs, even hardware failures. It is not possible to anticipate all potential exceptions, however, you can write code to handle exceptions to enable the program to continue running as normal. When an exception occurs in the executable section, the execution of the current block stops and control transfers to the exception-handling section. After an exception handler executes, control transfers to the next statement of the enclosing block. If an exception occurs but there is no exception handler, then the exception propagates , which we will discuss in the unhandled exception propagation tutorial. If you execute the block and enter the customer id as zero, Oracle will issue the following error:. Note that the following line does not execute at all because control transferred to the exception handling section.
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PL/SQL - Strings

They are referred as a nested block. Nested blocks are very common when we want to perform the certain process, and at the same time, the code for these process should be kept in a separate container block. Nested block concept will help the programmer to improve the readability by separating the complex things into each block and to handle the exception for each block inside the main outer block. This can be nested either in the execution part or in the exception handling part.
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Use of Cursor The major function of a cursor is to retrieve data, one row at a time, from a result set, unlike the SQL commands which operate on all the rows in the result set at one time. Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table. Hence the size of the cursor is limited by the size of this pre-defined area. Fetch: When the cursor is opened, rows can be fetched from the cursor one by one or in a block to perform data manipulation.
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