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Python Programming Language Specials
Python is a popular high-level, interpreted programming language known for its readability and ease of use. Python was invented by Guido Van Rossum and it was first released in February, 1991. The name python is inspired from Monte Python Flying Circus,...
Indexing in SQL- Explain with examples
Indexing in SQL is a technique used to improve the performance of queries by creating special data structures (indexes) that allow for faster data retrieval. Indexes are created on one or more columns of a table, and they store the values of those columns in a sorted...
Pattern matching in SQL- Like Operator
LIKE Operator: The LIKE operator is used to search for a specified pattern in a column. It allows the use of wildcards: % (percent sign): Matches zero or more characters. _ (underscore): Matches any single character. Examples: SELECT * FROM employees WHERE last_name...
Order of appearance and execution in the SELECT query?
For Appearance( So Few Jawans & Workers Go Home On Late) SELECT – FROM – JOIN – ON – WHERE – GROUP BY – HAVING – ORDER BY – LIMIT FROM – JOIN – ON – WHERE – GROUP BY – HAVING – SELECT – ORDER...
Functions in SQL- Examples
SQL provides various functions to perform operations on data stored in a database. Here are some commonly used SQL functions categorized based on their functionality: Aggregate Functions: COUNT(): Counts the number of rows. SUM(): Calculates the sum of values. AVG():...
Types of SQL commands
Data Definition Language (DDL) – to define and modify the structure of a database. Data Manipulation Language (DML) – to access, manipulate, and modify data in a database. Data Control Language (DCL) – to control user access to the data in the database...
What is Normalization, Denormalization concepts in Database Design?
Normalization and denormalization are two opposing database design techniques aimed at achieving different goals. Let's explore each concept: Normalization: Normalization is the process of organizing the data in a database to minimize redundancy and dependency. The...
What are Windows Functions in SQL, explain the usage
How to design and create well-structured and efficient database schema in SQL
Designing a well-structured and efficient database schema in SQL involves several steps and considerations. Here's a comprehensive guide to help you design a database schema that meets your application requirements while ensuring efficiency, scalability, and...
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