Zoho Oracle SQL and PLSQL Developer Interview Questions, Process, and Tips

Q1. What is normalization
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down data into smaller, more manageable tables

• It helps in reducing data redundancy by eliminating duplicate data

• Normalization ensures data integrity by enforcing relationships between tables

• There are different normal forms such as 1NF, 2NF, 3NF, and BCNF
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Q2. What is indexing
Ans. 
Indexing is a technique used to improve the performance of database queries by creating a data structure that allows for faster retrieval of data.
• Indexes are created on columns in a database table to speed up the retrieval of rows that match a certain condition.

• They work similar to an index in a book, allowing the database to quickly locate the rows that satisfy a query.

• Examples of indexes include primary keys, unique
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Q1. SQL based questions
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Q2. PLSQL based questions
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Q1. Questioned about each and every objects in database. procedures, functions with examples write Fibonacci series using plsql block joins, subqueries written a sql query to fetch weekdays
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Sql coding challenge

Q1. Syntax of stored procedure What is cursors Joins Cte
Ans. 
Stored procedures are used to store SQL queries for reuse. Cursors are used to iterate through a result set. Joins combine data from multiple tables. CTEs are temporary result sets.
• Stored procedures are used to store SQL queries for reuse

• Cursors are used to iterate through a result set

• Joins combine data from multiple tables

• Common Table Expressions (CTEs) are temporary result sets
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Q1. Explain how an Select statement is parsed in Oracle database
Ans. 
The parsing of a SELECT statement in Oracle database involves several steps.
• The statement is first checked for syntax errors.

• The query is then parsed to identify the objects involved and their relationships.

• The optimizer determines the most efficient execution plan.

• The plan is executed and the result set is returned.
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Q2. Explain how an insert/update is parsed in Oracle database
Ans. 
An insert/update statement in Oracle database is parsed by the SQL parser to check syntax and semantics.
• The SQL parser first checks the syntax of the insert/update statement to ensure it follows the rules of the SQL language.

• Next, the parser checks the semantics of the statement, which involves verifying the existence and accessibility of the tables and columns referenced in the statement.

• During parsing, the parser als...read more
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Q1. How do access elements in XML/JSON data
Ans. 
To access elements in XML/JSON data, use appropriate methods like XPath for XML and dot notation for JSON.
• For XML data, use XPath expressions to navigate and extract specific elements or attributes.

• For JSON data, use dot notation to access nested objects or arrays.

• In PL/SQL, you can use XMLTable or JSON_TABLE functions to extract data from XML or JSON respectively.
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Q2. Explain different pragma objects
Ans. 
Pragma objects in PL/SQL provide compiler directives for controlling program behavior.
• Pragma AUTONOMOUS_TRANSACTION: Allows a subprogram to execute SQL statements independently of the calling program.

• Pragma EXCEPTION_INIT: Associates an exception name with an Oracle error number.

• Pragma INLINE: Suggests the compiler to inline the code of a subprogram at the call site.

• Pragma RESTRICT_REFERENCES: Specifies the purity leve...read more
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Q1. Where do you see yourself in 5 years from now
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Quant and verbal related questions

Q1. All questions related to SQL and some python questions
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Q2. Explain about VIEW in SQL
Ans. 
A VIEW in SQL is a virtual table created by a query. It does not store data itself but displays data from one or more tables.
• Views are used to simplify complex queries by storing them as a virtual table.

• They can be used to restrict access to specific columns or rows of a table.

• Views can also be used to join multiple tables and present the data in a more readable format.

• Changes made to the underlying tables are reflecte...read more
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