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Working with NoSQL-like Features in SQL: Arrays, HSTORE, and Semi-Structured Models

SQL Kumar Prafull -
Table of Contents Introduction Why SQL Supports NoSQL-Like Structures Arrays in SQL: Definition and Use Cases Creating and Querying Array Columns Common Array Functions and Operators Unnesting Arrays with unnest() Searching Inside Arrays Aggregating and Constructing Arrays The HSTORE Data Type: Key-Value Storage in SQL Creating HSTORE Columns and Inserting Data Querying HSTORE Fields Updating and Deleting Keys in HSTORE Indexing Arrays and HSTORE Columns JSON vs HSTORE vs Arrays: When to Use...
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Version Control for SQL Scripts: Git, Database Migrations, and Change Management

Table of Contents Introduction Why Version Control Matters for SQL Using Git to Track SQL Scripts Best Practices for Organizing SQL Repositories Commit Strategies for Schema and Data Scripts Understanding...

SQL Performance Tuning with EXPLAIN PLAN: Understanding Query Optimization

Table of Contents Introduction Why SQL Performance Tuning Matters What Is EXPLAIN PLAN? Basic Usage of EXPLAIN PLAN (PostgreSQL, MySQL, Oracle) Understanding Query Execution Stages Interpreting Rows, Cost, Width, Time Common...

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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SQL

Window Functions in SQL: ROW_NUMBER(), RANK(), and DENSE_RANK() Explained

Table of Contents Introduction What Are Window Functions? Why Use Window Functions? Basic Syntax of a Window Function Introduction to ROW_NUMBER() Example: Using ROW_NUMBER() Introduction to RANK() Example: Using RANK() Introduction to DENSE_RANK() Example: Using DENSE_RANK() Key Differences Between the Three Using PARTITION BY with Window Functions Using ORDER BY in Window Functions Real-World Use Case: Top N Records per Group Pagination with ROW_NUMBER() Filtering First Row in Each Partition Performance Tips for Window Functions Common Errors...

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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 Columns Using Aggregate Functions with GROUP BY Using HAVING to Filter Groups GROUP BY vs WHERE Ordering...
SQL

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

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...
SQL

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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...
SQL

Using LIMIT and OFFSET in SQL

Table of Contents Introduction What is the LIMIT Clause? Syntax of LIMIT Why Use LIMIT? Basic Example of LIMIT What is the OFFSET Clause? Syntax of LIMIT with OFFSET Practical Pagination with...
SQL

Sorting Results with ORDER BY in SQL

Table of Contents Introduction What is the ORDER BY Clause? Basic Syntax of ORDER BY Sorting in Ascending Order (ASC) Sorting in Descending Order (DESC) Default Sorting Behavior Sorting by Multiple...
SQL

Logical Operators in SQL: AND, OR, NOT

Table of Contents Introduction What Are Logical Operators in SQL? The Role of Logical Operators in Filtering Basic Syntax and Usage Using AND to Combine Conditions Using OR to Widen...
SQL

Using the WHERE Clause for Filtering

Table of Contents Introduction What is the WHERE Clause? Basic Syntax of WHERE Filtering with Equality Conditions Using !=, <>, and NOT Greater Than and Less Than Comparisons Filtering Text with...
SQL

Introduction to the SELECT Statement

Table of Contents Introduction What is the SELECT Statement? Basic Syntax of SELECT Selecting All Columns with * Selecting Specific Columns Using Aliases with AS Selecting Distinct Records Filtering Results with WHERE Logical...
SQL

Basic Data Types in SQL

Table of Contents Introduction Why Data Types Matter in SQL Overview of SQL Data Type Categories Integer Types Decimal and Floating-Point Types Character and String Types Date and Time Types Boolean Type Binary...

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Today in History

Today in History – 28 April

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1701 John Norris of Britain met Aurangjeb at Parnela in South India. 1740 Thorle BajiRao Peshwa passed away at Raverkhedi near the banks of the Narmada river near Khargon and his son Balaji Baji Rao was placed on his father's throne as...
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