Cognizant Plsql Developer Interview Questions, Process, and Tips for Experienced

Oracle pl sql developer

Q1. Views and triggers basics
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Q2. Learning capabilities of new softwares
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I have a strong ability to learn new software quickly.
• I am a self-motivated learner and enjoy exploring new technologies.

• I am comfortable with online tutorials, documentation, and experimenting with new software.

• I have experience learning new software such as Oracle SQL Developer, Toad, and PL/SQL Developer.

• I am able to adapt to new software quickly and efficiently.
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Q1. What is view? Can we update in view?
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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
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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
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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?
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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. Types of cursors
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Types of cursors include implicit, explicit, and parameterized cursors.
• Implicit cursors are automatically created by Oracle when a SQL statement is executed.

• Explicit cursors are defined by the programmer using the DECLARE, OPEN, FETCH, and CLOSE statements.

• Parameterized cursors allow for dynamic SQL statements to be executed with different parameters.
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