Wipro Oracle SQL and PLSQL Developer Interview Questions and Answers

Q1. Tell me about OLAP systems.
Ans. 
OLAP systems are designed for analyzing and managing large volumes of data from multiple perspectives.
• OLAP stands for Online Analytical Processing

• OLAP systems allow users to analyze data in real-time

• They provide advanced analytics capabilities like data mining, forecasting, and trend analysis

• Examples of OLAP systems include Oracle Essbase, Microsoft Analysis Services, and IBM Cognos
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Q2. How to process files in different formats and from different sources to load a single table in Oracle.
Ans. 
Use Oracle External Tables and SQL Loader to process files in different formats and from different sources to load a single table.
• Create External Tables in Oracle to define the structure of the files from different sources.

• Use SQL Loader to load data from the files into the External Tables.

• Transform and manipulate the data as needed using SQL queries before inserting into the final table.
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Q3. More questions on partitioning. Range and List partitioning. Interval partition, split partition etc
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Q4. Questions on indexes
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Q5. Questions on performance tuning
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SQL and PLSQL querys writing.

Q1. Self introduction ,and salary discussion
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Q2. Self introduction and salary discussion, company details.
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Q1. What is sql , index , stored proc , triggers
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Q1. What is view? Can we update in view?
Ans. 
A view is a virtual table created by a query. It does not store data itself but displays data from one or more tables. Views can be used for querying data as if it were a table.
• Views are created using a SELECT statement with optional joins, WHERE clauses, etc.

• Views can simplify complex queries by pre-defining joins and filters.

• Views do not store data themselves, they display data from underlying tables.

• Views can be upd...read more
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Q2. What is synonym?
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A synonym is an alternative name for a table, view, sequence, or other database object.
• Synonyms can be used to provide a different name for an object, making it easier to reference.

• They can be created to reference objects in other schemas or databases.

• Synonyms can be public (accessible to all users) or private (accessible only to the creator).
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Q3. What is sequence
Ans. 
A sequence is a database object in Oracle that generates unique numbers in a specified order.
• Used to generate unique numbers for primary key columns

• Can be used in INSERT statements to automatically generate values

• Can be defined to increment by a specific value and start at a specific number
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Q4. What is procedures?
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Procedures are named PL/SQL blocks that perform a specific task. They can accept parameters and return values.
• Procedures are stored in the database and can be called by other PL/SQL blocks or applications.

• They can accept input parameters to perform operations and can also return output values.

• Procedures help in modularizing code and promoting reusability.

• Example: CREATE PROCEDURE calculate_salary (emp_id IN NUMBER) IS
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Q5. What is difference between procedure and functions
Ans. 
Procedures do not return any value while functions return a value.
• Procedures are used to perform an action, while functions are used to calculate and return a value.

• Procedures do not have a return statement, while functions must have a return statement.

• Functions can be called from SQL queries, while procedures cannot be called directly in SQL queries.
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Q6. What is partitions?
Ans. 
Partitions in PL/SQL are used to divide a table into smaller, more manageable pieces.
• Partitions help improve query performance by allowing data to be stored in separate segments based on a specified criteria.

• Common partitioning methods include range, hash, list, and composite partitioning.

• Example: Partitioning a sales table by month can improve query performance when searching for sales data within a specific time fram
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Q1. Tell about your self
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Q2. Interested Technology
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Q1. What is SQL where it use
Ans. 
SQL is a programming language used for managing and manipulating relational databases.
• SQL stands for Structured Query Language

• It is used to communicate with databases to perform tasks such as querying data, updating records, and creating tables

• Examples of SQL commands include SELECT, INSERT, UPDATE, DELETE
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Q2. What is Join and Procedure
Ans. 
Join is used to combine rows from two or more tables based on a related column, while Procedure is a set of SQL statements that perform a specific task.
• Join is used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Procedure is a set of SQL statements stored in the database and executed when called

• Procedures can accept input parameters
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Q1. Architecture of sql
Ans. 
SQL architecture refers to the structure and components of a SQL database system.
• SQL architecture includes components like storage engine, query processor, and buffer manager.

• The storage engine manages data storage and retrieval, while the query processor processes SQL queries.

• The buffer manager handles caching and memory management to optimize performance.

• Examples of SQL architectures include MySQL, Oracle, and SQL Se
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Q2. Recovery models
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Q1. How to insert multiple values in one go
Ans. 
Use the INSERT INTO statement with multiple value sets separated by commas
• Use the INSERT INTO statement followed by the table name

• List the column names in parentheses after the table name

• Use the VALUES keyword followed by multiple value sets in parentheses, separated by commas

• Example: INSERT INTO table_name (column1, column2) VALUES (value1, value2), (value3, value4)
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Q2. Update query using joins
Ans. 
Update query using joins in SQL
• Use UPDATE statement with JOIN clause to update data in multiple tables

• Specify the tables to be updated and joined using ON clause

• Set the columns to be updated in SET clause
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