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I applied via Recruitment Consulltant and was interviewed in Dec 2024. There was 1 interview round.
Public and private procedures in PL/SQL control the visibility and accessibility of procedures within a package.
Public procedures can be accessed by other packages or programs outside the package.
Private procedures can only be accessed within the package where they are defined.
Public procedures are declared in the package specification using the 'PUBLIC' keyword.
Private procedures are declared in the package body witho...
I applied via Recruitment Consulltant and was interviewed in Dec 2024. There was 1 interview round.
I applied via Naukri.com and was interviewed in Jan 2024. There were 2 interview rounds.
What people are saying about Clover Infotech
I applied via Naukri.com and was interviewed in Sep 2024. There was 1 interview round.
Optimizing stored procedures involves using proper indexing, reducing unnecessary loops, and minimizing database calls.
Use proper indexing on columns used in WHERE clauses to improve query performance
Avoid using cursors and loops whenever possible, as they can be inefficient
Minimize the number of database calls by combining multiple queries into a single query or using temporary tables
Consider using bulk processing tec...
Optimizing SQL queries involves using indexes, minimizing data retrieval, avoiding unnecessary joins, and optimizing query structure.
Use indexes on columns frequently used in WHERE clauses
Minimize data retrieval by selecting only necessary columns
Avoid unnecessary joins by using EXISTS or IN clauses instead
Optimize query structure by using appropriate join types and conditions
Returning clause is used to return a value from a function or procedure in PL/SQL.
Used to return a single value from a function or procedure
Can be used to return multiple values using OUT parameters
Helps in passing values back to the calling program
Triggers can lead to performance issues, complexity, and potential for unintended consequences.
Triggers can make code harder to debug and maintain
They can lead to cascading effects if not carefully implemented
Performance can be impacted if triggers are not optimized
Triggers can introduce dependencies between different parts of the codebase
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
Joins are used to retrieve data from multiple tables based on a related column.
Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;
Some built-in functions in SQL include AVG, COUNT, MAX, MIN, SUM, and CONCAT.
AVG: Calculates the average value of a numeric column
COUNT: Counts the number of rows in a result set
MAX: Returns the maximum value in a column
MIN: Returns the minimum value in a column
SUM: Calculates the sum of values in a column
CONCAT: Concatenates two or more strings together
Types of cursors in database management systems include implicit, explicit, and parameterized cursors.
Implicit cursors are automatically created by the database when a SQL statement is executed.
Explicit cursors are defined by the programmer and give more control over the result set.
Parameterized cursors allow for dynamic SQL statements with parameters.
Examples: SELECT statement using implicit cursor, DECLARE, OPEN, FET...
Procedures are used to perform an action, while functions return a value.
Procedures do not return a value, while functions do.
Functions can be used in SQL queries, while procedures cannot.
Functions can be called from within SQL statements, while procedures cannot.
Procedures can have OUT parameters to return multiple values, while functions can only return a single value.
Use a subquery to find the third highest salary in a table.
Use the RANK() function to assign a rank to each salary in descending order.
Filter the results to only include rows with a rank of 3.
Consider handling ties in salaries appropriately.
A package is a collection of related procedures, functions, variables, and other PL/SQL constructs.
Packages help organize and encapsulate code for easier maintenance and reuse.
They can contain both public and private elements.
Packages can be used to group related functionality together, improving code modularity.
Example: CREATE PACKAGE my_package AS ... END my_package;
Resolved a critical bug causing data loss and implemented a new feature for better user experience.
Identified root cause of data loss bug by analyzing database queries and logs
Collaborated with cross-functional teams to prioritize and implement a fix
Designed and implemented a new feature based on user feedback to enhance usability
Different types of indexes include B-tree, Bitmap, Function-based, and Reverse key indexes.
B-tree indexes are the most common type and are suitable for most indexing needs.
Bitmap indexes are used for columns with low cardinality, such as gender or status columns.
Function-based indexes are created based on expressions or functions applied to columns.
Reverse key indexes store keys in reverse order to reduce contention in
Analytical functions in SQL are used to perform calculations across a set of rows related to the current row.
Analytical functions operate on a group of rows and return a single result for each row.
They can be used to calculate running totals, moving averages, rank, percentiles, etc.
Examples include ROW_NUMBER(), RANK(), DENSE_RANK(), SUM() OVER(), AVG() OVER().
Aggregate functions in SQL are functions that operate on a set of values and return a single value as output.
Aggregate functions include functions like SUM, AVG, COUNT, MIN, and MAX.
They are used with the GROUP BY clause to perform calculations on groups of rows.
Examples: SELECT SUM(salary) FROM employees; SELECT AVG(age) FROM students GROUP BY class;
I identified and optimized slow-performing SQL queries by analyzing execution plans and indexing strategies.
Identified slow-performing SQL queries using tools like Oracle SQL Developer or TOAD.
Analyzed execution plans to understand query performance bottlenecks.
Optimized queries by rewriting SQL code, adding indexes, or restructuring data.
Used tools like Explain Plan or SQL Tuning Advisor to improve query performance.
R...
Data modeling is the process of creating a visual representation of data structures and relationships within a database.
Data modeling helps in organizing and understanding complex data systems.
It involves identifying entities, attributes, and relationships between them.
Examples include ER diagrams, UML diagrams, and relational data models.
I conducted thorough analysis by reviewing code, logs, and discussing with team members.
Reviewed code to identify potential issues
Analyzed logs for error messages and patterns
Discussed with team members to gather insights and perspectives
Used debugging tools to trace the root cause
A trigger in database management is a special type of stored procedure that is automatically executed when certain events occur in a database.
Triggers can be used to enforce business rules, maintain referential integrity, and automate repetitive tasks.
There are two main types of triggers: row-level triggers and statement-level triggers.
Row-level triggers are fired for each row affected by a triggering statement, while ...
I applied via Naukri.com and was interviewed in Oct 2024. There was 1 interview round.
Developed a PL/SQL project for managing inventory and sales data in a retail store.
Designed database tables to store product information, sales transactions, and customer details.
Implemented PL/SQL procedures and functions for adding, updating, and querying data.
Created triggers to enforce business rules and maintain data integrity.
Developed reports using PL/SQL queries to analyze sales performance and inventory levels
I work on performance optimization by analyzing query execution plans, indexing, and code refactoring.
Analyzing query execution plans to identify bottlenecks
Creating appropriate indexes to improve query performance
Refactoring code to optimize resource usage
Using tools like Explain Plan and SQL Tuning Advisor
I applied via Approached by Company and was interviewed in Sep 2023. There were 3 interview rounds.
Window functions in SQL are used to perform calculations across a set of table rows related to the current row.
Window functions are used to calculate values based on a set of rows related to the current row.
They allow you to perform calculations without grouping the rows into a single output row.
Examples of window functions include ROW_NUMBER(), RANK(), and LAG().
Packages in PL/SQL are used to group related procedures, functions, variables, and other PL/SQL constructs together for better organization and security.
Packages help in modularizing code for easier maintenance and debugging
They provide encapsulation and hide implementation details
Packages can contain multiple procedures, functions, variables, cursors, and exceptions
They improve performance by reducing network traffic
E...
Create a function based on shared logic
Identify common logic that can be reused in multiple functions
Create a separate function to encapsulate the shared logic
Call the shared function from other functions where the logic is needed
I applied via Referral and was interviewed before Jun 2023. There was 1 interview round.
Oracle pl sql developer
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based on 11 reviews
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