PL/SQL need and benefits

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Need for PL/SQL

SQL statements are defined in term of constraints we wish to fix on the result of a query. Such a language is commonly referred to as declarative. This contrasts with the so called procedural languages where a program specifies a list of operations to be performed sequentially to achieve the desired result. PL/SQL adds selective  (i.e. if…then…else…) and iterative constructs (i.e. loops) to SQL.

PL/SQL is most useful to write triggers  and stored procedures. Stored procedures are units of procedural code stored in a compiled form within the database.

Benefits of PL/SQL

    • Block Structures: PL SQL consists of blocks of code, which can be nested within each other. Each block forms a unit of a task or a logical module. PL/SQL Blocks can be stored in the database and reused.
    •  Procedural Language Capability: PL SQL consists of procedural language constructs such as conditional statements (if else statements) and loops like (FOR loops).
    •  Better Performance: PL SQL engine processes multiple SQL statements simultaneously as a single block, thereby reducing network traffic.
  • Error Handling: PL/SQL handles errors or exceptions effectively during the execution of a PL/SQL program. Once an exception is caught, specific actions can be taken depending upon the type of the exception or it can be displayed to the user with a message.
Relational database, oracle and PL/SQL
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