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Most beginners think JOIN only combines tables…But one wrong JOIN can DOUBLE or TRIPLE your rows 😳
Most beginners think JOIN only combines tables…
But one wrong JOIN can DOUBLE or TRIPLE your rows 😳
sql SELECT * FROM orders o JOIN customers c ON o.city = c.city;
If 10 customers exist in same city:
💥 your rows explode.
This is called:
🚨 Duplicate Explosion
Always check:
✅ Primary keys
✅ Duplicate values
✅ JOIN conditions
Видео Most beginners think JOIN only combines tables…But one wrong JOIN can DOUBLE or TRIPLE your rows 😳 канала Mohammad Rahmatullah
But one wrong JOIN can DOUBLE or TRIPLE your rows 😳
sql SELECT * FROM orders o JOIN customers c ON o.city = c.city;
If 10 customers exist in same city:
💥 your rows explode.
This is called:
🚨 Duplicate Explosion
Always check:
✅ Primary keys
✅ Duplicate values
✅ JOIN conditions
Видео Most beginners think JOIN only combines tables…But one wrong JOIN can DOUBLE or TRIPLE your rows 😳 канала Mohammad Rahmatullah
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13 мая 2026 г. 22:34:37
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