Arama Sonuçları: "#SQLBasics"

12 sonuç
Inflictt
Inflictt@Saksham1172975·
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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KJ_DataEngineer
KJ_DataEngineer@Heisenberg_Baba·
#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.
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KJ_DataEngineer
KJ_DataEngineer@Heisenberg_Baba·
#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...
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❤احمد عاشور
❤احمد عاشور@Gr33nArrow1996·
يا حبايبنا فين وحشتونا ..لسه فكرنا ؟ ولا نستونا ! تلخيص أول ساعة من كورس 29 ساعة #SQL #sqlbasics 1/6
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Vennu Sanjana
Vennu Sanjana@VennuSanjana·
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
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