How to write pl sql procedure

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All the statements of a block are passed to oracle engine all at once which increases processing speed and decreases the traffic. SQL statements are passed to Oracle engine one at a time which increases traffic and decreases speed. SQL has no facility of error checking during manipulation of data. It is declarative, that defines what needs to be done, rather than how things need to be done. Execute as a single statement.
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PL/SQL Function

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PL/SQL Tutorial - PL/SQL - passing parameters in procedures and functions.

Inputs Each procedure has predefined input parameters, which must be passed in the predefined order. The parameters identify the transaction being processed and the context in which the program is called. You can derive additional inputs from any Oracle table based on the predefined input parameters. Logic The procedure uses the inputs and performs any logical processing and calculations. The program can be a simple program, such that it returns a fixed number, or it can be a complex algorithm that performs a number of functions.
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PL/SQL Loops

The call spec tells Oracle Database which Java method to invoke when a call is made. It also tells the database what type conversions to make for the arguments and return value. Stored procedures offer advantages in the areas of development, integrity, security, performance, and memory allocation. Oracle Database Application Developer's Guide - Fundamentals for more information on stored procedures, including how to call stored procedures and for information about registering external procedures. You can also create a procedure as part of a package.
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The parameter mode specifies whether a parameter can be read from or write to. An IN parameter is read-only. You can reference an IN parameter inside a procedure, but you cannot change its value.
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