QuickXpert Infotech Software Developer Interview Questions, Process, and Tips

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Q1. What is normal types of SQL views
Ans. 
Normal types of SQL views include simple views, complex views, and materialized views.
• Simple views are based on a single table or multiple tables with a simple join.

• Complex views involve more complex queries, such as subqueries or aggregations.

• Materialized views store the result of a view as a physical table for improved performance.
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Q2. What is database and data
Ans. 
A database is a structured collection of data, while data refers to the raw facts and statistics that are stored in a database.
• A database is a software system that organizes and stores data in a structured manner.

• Data refers to the raw facts and statistics that are stored in a database.

• Databases are used to store, retrieve, and manage large amounts of data efficiently.

• Examples of databases include MySQL, Oracle, MongoD...read more
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Q3. What is sub queries of sql
Ans. 
Subqueries in SQL are queries nested within another query. They can be used to retrieve data for further analysis or filtering.
• Subqueries are enclosed within parentheses and can be used in SELECT, FROM, WHERE, and HAVING clauses.

• They can be used to retrieve a single value, a list of values, or a table of values.

• Subqueries can be correlated or non-correlated, depending on whether they reference the outer query.

• Examples ...read more
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Q4. What are pl/SQL types
Ans. 
PL/SQL types are data types used in PL/SQL programming language.
• PL/SQL types include scalar, composite, reference, and lob types.

• Scalar types include number, varchar2, date, boolean, etc.

• Composite types include record and table types.

• Reference types include cursor and object types.

• LOB types include BLOB, CLOB, NCLOB, and BFILE.

• PL/SQL types are used to define variables, parameters, and functions in PL/SQL programs.
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Q5. What are operating system
Ans. 
Operating systems are software that manage computer hardware and software resources.
• Operating systems provide an interface between users and computer hardware.

• They manage computer memory, processes, and file systems.

• Examples include Windows, macOS, Linux, and Android.
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