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Database Normalization – Normal Forms 1NF 2NF 3NF Table Examples

Database Normalization – Normal Forms 1NF 2NF 3NF Table Examples – Normal Forms are important for ensuring that data is structured logically, reducing redundancy, and maintaining data integrity. Database Normalization – Normal Forms 1NF 2NF 3NF: If a table is not properly normalized and has data redundancy(repetition) then it will not only consume extra memory […]

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SQL

Common Table Expression CTE in SQL

Common Table Expression CTE in SQL – The WITH clause in MySQL is used to specify a Common Table Expression. CTE in SQL: A CTE is the result set of a query which exists temporarily and for use only within the context of a larger query. Much like a derived table, the result of a

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Data Analysis

Types of Sampling Techniques in Data Analytics

Types of Sampling Techniques in Data Analytics| What is Sampling? Data sampling techniques is a statistical method that involves selecting a part of a population of data to create representative samples. Let’s say we want to know the percentage of people who use iPhones in a city, for example. One way to do this is

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Data Analysis

What Is a Data Analyst?

What Is a Data Analyst? A data analyst is a problem solver who prepares and analyzes data to provide organizations with insights that help them make better business decisions. In these organizations, the job of the data analyst is to assign a numerical value to these important business functions so performance can be assessed and

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SQL

SQL Order of Execution – Strong Understanding

Understanding SQL query order can help you diagnose why a query won’t run, and even more frequently will help you optimize your queries to run faster. What is SQL Order of Execution? SQL order of execution refers to the order in which the different clauses in the query are evaluated. It’s worth understanding because the

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SQL

SQL vs. PL/SQL

SQL vs. PL/SQL: Structured Query Language (SQL) is a standard Database language that is used to create, maintain and retrieve the relational database. PL/SQL is a block-structured language that enables developers to combine the power of SQL with procedural statements. Project Scenario: Online Retail Order Processing System The Goal: Develop a backend system for an

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SQL

CTE vs. SUBQUERY | When should you use JOINs and CTEs instead of subqueries in SQL

When should you use JOINs and CTEs instead of subqueries in SQL – CTE vs. SUBQUERY: With the WITH statement, you can create temporary tables to store results, making complex queries more readable and maintainable. Subqueries, also known as inner queries, are powerful tools to embed one query within another. By nesting queries within parentheses

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SQL

SQL DDL – Data Definition Language Commands

SQL DDL – Data Definition Language Commands -SQL commands are extensively used to interact with databases, enabling users to perform a wide range of actions on database systems. Understanding these commands is crucial for effectively managing and manipulating data. Types of SQL Commands: There are four types of SQL commands: DDL, DML, DCL, TCL. Data

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SQL

SQL SELECT Statement

The SQL SELECT Statement is the most commonly used command in Structured Query Language. It is used to access the records from one or more database tables and views. SQL SELECT Query: The SELECT statement in SQL is used to fetch or retrieve data from a database. It allows users to access the data and

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SQL

SQL CREATE TABLE

SQL CREATE TABLE statement is used to create table in a database. Let’s see the simple syntax to create the table. CREATE TABLE Syntax: CREATE table table_name(Column1 datatype (size),column2 datatype (size),..columnN datatype(size)); Here table_name is name of the table, column is the name of column. Users can define the table structure by specifying the column’s

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