sql-common-pitfalls-mistakes.md
SQL
Top 10 Common SQL Mistakes Data Analysts Make (and How to Fix Them)
Discover the 10 most frequent SQL errors data analysts face, backed by real‑world stats, and learn p...
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sql-constraints-data-integrity.md
SQL
Enforcing Data Integrity with SQL Constraints: Primary Keys and Foreign Keys
Learn how primary key and foreign key constraints safeguard data integrity in SQL, with practical ex...
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SQL
Why You Should Avoid SQL Cursors and What to Use Instead
Discover the performance pitfalls of SQL cursors, when they’re justified, and practical set‑based al...
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SQL
How to Read and Interpret a SQL Execution Plan – A Practical Guide for Data Professionals
Master the art of reading SQL execution plans with step‑by‑step guidance, key operators, common warn...
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SQL
SQL for Beginners – Part 1: Understanding SELECT and Basic Queries
Learn the fundamentals of SQL SELECT statements, filtering, sorting and limiting results. Ideal for ...
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SQL
The Four Types of SQL Joins: A Deep Dive with Real‑World Examples
Discover inner, left, right, and full outer joins with clear examples, performance tips, and best‑pr...
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SQL
Using SQL LAG and LEAD for Comparing Rows in Time‑Series Data
Learn how SQL LAG and LEAD window functions let you compare current, previous and future rows in tim...
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SQL
How to Handle NULL Values in SQL: COALESCE and IS NULL Explained
Master NULL handling in SQL with COALESCE and IS NULL. Learn syntax, performance tips, real‑world ex...
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SQL
Database Partitioning in SQL: Boosting Query Speed on Massive Tables
Discover how SQL table partitioning—across SQL Server, MySQL and PostgreSQL—can slash query times, s...
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SQL
A Step‑by‑Step Walkthrough of Recursive CTEs in SQL
Discover how recursive common table expressions (CTEs) work, with clear syntax, real‑world examples ...
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SQL
SQL Security Best Practices for Data Analysts and Developers
Discover essential SQL security best practices for data analysts and developers, covering authentica...
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SQL
SQL Set Operators Demystified: UNION, INTERSECT and EXCEPT Explained for Data Analysts
Discover how UNION, INTERSECT and EXCEPT work in SQL, their performance impact, cross‑database synta...
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SQL
Creating and Using SQL User‑Defined Functions (UDFs): A Practical Guide for Data Analysts
Learn how to create, optimise and maintain scalar, table‑valued and inline UDFs in SQL Server, Postg...
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