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Thread 3 / 5 Day 54/365 🚀 – Keys & Constraints • Candidate Key • Primary Key • Foreign Key • Integrity Constraints • Entity & Referential Integrity Constraints maintain correctness. No integrity → no reliable system. #DBMS #SQLBasics #DatabaseConcepts #DeveloperGrowth

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#SQLBasics UNION vs UNION ALL — Quick Difference UNION → Combines results and removes duplicates UNION ALL → Combines results and keeps duplicates Performance: UNION ALL is faster (no sorting) Rule: Use UNION when you need unique rows. Use UNION ALL when you need all rows.

#SQLBasics COUNT(*), COUNT(1) & COUNT(column) — Quick Difference COUNT(*) → Counts all rows (fastest & most common) COUNT(1) → Same as COUNT(*) — counts all rows COUNT(column) → Counts only NON-NULL values in that column Follow for more...

Microsoft SQL Server Nivel Inicial ⏱️ 4.2 hours ⭐ 4.35 👥 1,450 🔄 Sep 2023 💰 $14.99 → 100% OFF comidoc.com/udemy/aprendes… #SQLServer #MSSQL #SQLBasics #udemy

يا حبايبنا فين وحشتونا ..لسه فكرنا ؟ ولا نستونا ! تلخيص أول ساعة من كورس 29 ساعة #SQL #sqlbasics 1/6

Day - 16 : Subqueries Learned how subqueries work in SQL, using one query inside another to filter data in a simple, smarter way. #SQLWITHIDC #SQL #sqlbasics

Day 15 of the IDC 21 Days of SQL Challenge organized by @indiandataclub @dpdzero #SQLWithIDC #SQL #sqlbasics

Day 14 of the IDC 21 Days of SQL Challenge organized by @indiandataclub @dpdzero #SQLWithIDC #SQL #sqlbasics

Day 13 of the IDC 21 Days of SQL Challenge organized by @indiandataclub @dpdzero #SQLWithIDC #SQL #sqlbasics

Day 12 of the IDC 21 Days of SQL Challenge organized by @indiandataclub @dpdzero #SQLWithIDC #SQL #sqlbasics