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SQL for Financial Analytics: Profit & Loss Reporting, Forecasting, and Ratio Analysis

Table of Contents Introduction Importance of SQL in Financial Analysis Core Financial Statements in Data Tables Building a Profit & Loss (P&L) Report in SQL Structuring Accounts: Revenue vs...
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Data Warehousing Concepts in SQL: Understanding Star and Snowflake Schemas

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SQL with APIs and JSON Fields in PostgreSQL: Working with Semi-Structured Data

Table of Contents Introduction Why JSON Support Matters in Modern SQL PostgreSQL JSON vs JSONB Creating Tables with JSON Fields Inserting JSON Data (from APIs or files) Accessing JSON Properties...
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SQL for Data Engineering: ETL Concepts and Building Scalable Data Pipelines

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Working with JSON in SQL: Storing, Querying, and Manipulating JSON Data

Table of Contents Introduction Why Use JSON in SQL Databases? Storing JSON Data in Tables JSON Data Types and Columns Basic JSON Syntax Inserting JSON Values Retrieving JSON Data Accessing JSON Fields...

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Error Handling in SQL: Managing Exceptions and Ensuring Reliable Transactions

Table of Contents Introduction Why Error Handling Matters in SQL Types of Errors in SQL Syntax Errors vs Runtime Errors Understanding Transaction Errors Rollbacks for Safe Error Recovery Error Handling in...

Stored Procedures and Functions in SQL: Encapsulating Logic for Reuse and Automation

Table of Contents Introduction What Are Stored Procedures and Functions? Benefits of Using Stored Routines Stored Procedures vs Functions: Key Differences Syntax for Creating Stored Procedures Executing a Stored Procedure Parameters...

Triggers in SQL: Automating Database Behavior

Table of Contents Introduction What Is a Trigger in SQL? Why Use Triggers? Types of Triggers Syntax of a Trigger BEFORE vs AFTER Triggers INSERT, UPDATE, and DELETE Triggers Trigger Events: Row-Level...

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FULL OUTER JOIN and CROSS JOIN in SQL — Concepts and Use Cases

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Table of Contents Introduction What is a FULL OUTER JOIN? Syntax of FULL OUTER JOIN When to Use FULL OUTER JOIN FULL OUTER JOIN Example Filtering with FULL OUTER JOIN Handling...

LEFT JOIN vs RIGHT JOIN in SQL — A Detailed Comparison with Examples

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Table of Contents Introduction What are SQL Joins? Overview of LEFT JOIN Overview of RIGHT JOIN LEFT JOIN Syntax RIGHT JOIN Syntax Understanding Table Positioning Visualizing LEFT vs RIGHT JOIN Practical Use Case:...

INNER JOIN in SQL Explained with Examples

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Table of Contents Introduction What is an INNER JOIN? Syntax of INNER JOIN How INNER JOIN Works INNER JOIN with Real Tables INNER JOIN with Aliases Filtering with INNER JOIN INNER JOIN...

Understanding Joins in SQL

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Table of Contents Introduction What is a Join in SQL? Why Do We Use Joins? Types of Joins in SQL INNER JOIN Explained LEFT JOIN Explained RIGHT JOIN Explained FULL OUTER JOIN...

Basic Subqueries and Their Use Cases in SQL

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Table of Contents Introduction What is a Subquery? Types of Subqueries Why Use Subqueries? Syntax of a Subquery Subqueries in SELECT Clause Subqueries in FROM Clause Subqueries in WHERE Clause Single-Row vs Multi-Row...

Using the IN, BETWEEN, and LIKE Operators in SQL

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Table of Contents Introduction Why Use Conditional Operators? The Role of IN, BETWEEN, and LIKE Basic Syntax Recap The IN Operator IN with Numbers IN with Strings IN with Subqueries NOT IN Clause Performance...

Using the IN, BETWEEN, and LIKE Operators in SQL

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Table of Contents Introduction Why Use Conditional Operators? The Role of IN, BETWEEN, and LIKE Basic Syntax Recap The IN Operator IN with Numbers IN with Strings IN with Subqueries NOT IN Clause Performance...

Aliasing Columns and Tables in SQL

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Table of Contents Introduction What is an Alias in SQL? Why Use Aliases? Syntax of Aliases in SQL Column Aliases with AS Column Aliases Without AS Table Aliases with AS Table Aliases...

Filtering Groups with HAVING in SQL

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Table of Contents Introduction What is the HAVING Clause? Difference Between WHERE and HAVING Why Use HAVING? Basic Syntax of HAVING Simple Example with HAVING Using HAVING with COUNT() Filtering on SUM()...

Grouping Data with GROUP BY in SQL

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Table of Contents Introduction What is GROUP BY in SQL? Basic Syntax of GROUP BY When to Use GROUP BY Simple GROUP BY Example Grouping by One Column Grouping by Multiple...

Aggregate Functions in SQL: COUNT, SUM, AVG, MIN, MAX

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Table of Contents Introduction What are Aggregate Functions? Syntax of Aggregate Functions Using COUNT() to Count Records Counting Non-NULL vs All Rows Using SUM() for Totaling Values Applying SUM() with Filters Using...

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Introduction What is NULL in SQL? NULL vs Zero vs Empty String Why NULL Exists in Databases Checking for NULL: IS NULL and IS NOT NULL Using NULL in...
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