Pl Sql Interview Questions And Answers
Comprehensive Guide: Common PL/SQL Interview Questions and Answers
Pl Sql Interview Questions And Answers
PL/SQL interview questions typically cover a range of topics including basic syntax, data types, control structures, error handling, procedures, functions, triggers, and performance tuning. Some common PL/SQL interview questions may include explaining the difference between functions and procedures, the purpose of triggers, how to handle exceptions, and ways to optimize code performance. It is essential to be well-versed in PL/SQL concepts, practice coding examples, and be ready to explain your thought process behind solving problems during the interview.
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1 - What is PL/SQL?
PL/SQL (Procedural Language/Structured Query Language) is Oracle's procedural extension of SQL used to enhance the capabilities of SQL by providing procedural constructs such as loops, conditional statements, and error handling within SQL.
2) Explain the architecture of PL/SQL.
PL/SQL follows a client server architecture where the PL/SQL block is first sent to the Oracle server, which compiles and executes it within the server's memory. This reduces network traffic and improves performance as only the results are sent back to the client.
3) What are the different types of PL/SQL blocks?
There are three types of PL/SQL blocks: anonymous blocks, stored procedures, and functions. Anonymous blocks are ad hoc blocks of code, while stored procedures and functions are named blocks of code that can be reused.
4) What are the advantages of using PL/SQL?
PL/SQL offers advantages such as improved performance due to reduced network traffic, better security with encapsulation of code in stored procedures, enhanced productivity with reusable code blocks, and better error handling capabilities.
5) How do you handle exceptions in PL/SQL?
Exceptions in PL/SQL can be handled using the EXCEPTION block where specific exceptions can be caught and appropriate actions can be taken, such as logging the error, retrying the operation, or propagating the exception to a higher level.
6) Explain the difference between a stored procedure and a function.
A stored procedure is a subroutine that performs specific tasks and may or may not return a value. On the other hand, a function is a subroutine that always returns a value and is used to calculate and return a single value.
7) What are cursors in PL/SQL?
Cursors are used to process a set of rows returned by a SQL query one row at a time. They provide control over the context area that contains the query result and allow for manipulation of data row by row.
8) How do you declare variables in PL/SQL?
Variables in PL/SQL are declared using the DECLARE keyword followed by the variable name and its data type. Variables can also be assigned default values during declaration.
9) What is a trigger in PL/SQL?
Triggers are special types of stored procedures that are automatically executed or fired when certain events occur in a database. These events can be inserts, updates, deletes, or schema alterations.
10) How can you improve the performance of PL/SQL code?
Performance of PL/SQL code can be improved by optimizing SQL queries, minimizing context switches between PL/SQL and SQL engine, bulk processing with FORALL statements, using proper indexes, and avoiding unnecessary looping.
These are some common PL/SQL interview questions and answers to help you prepare for your interview.
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