CGI Group Oracle SQL and PLSQL Developer Interview Questions and Answers

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?
Ans. 
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?
Ans. 
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. 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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Performance tunning and sql profiler

Q1. Types of Indexes
Ans. 
Types of indexes include clustered, non-clustered, unique, composite, and filtered indexes.
• Clustered indexes physically reorder the data in the table based on the index key.

• Non-clustered indexes create a separate structure for the index, pointing back to the original table data.

• Unique indexes ensure that no two rows have the same values in the indexed columns.

• Composite indexes are created on multiple columns to improve...read more
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Q2. Sceanrio based question
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Q1. Salary discussion
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Q2. Joining date and last working date
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Q1. Qquestions about your skills
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Asked question from basic aptitude topics

Q1. Asked question coding languages like c, python, java, SQL
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Q1. Discussed about terms and policies of company. Also work profile
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Q1. Tell me about yourself.
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