Lossless-Join vs Dependency-Preservation | GATE DA 2027 DBMS & Data Warehousing in Hindi

Table todi, wapas jodi - aur paanch rows ki jagah aath nikal aayin. Teen rows kabhi thi hi nahi. ⏱ CHAPTERS 0:00 Introduction 0:44 The idea 1:43 Building it up 2:30 Project R onto the two pieces 3:18 R1 join R2 gives 8 rows, not 5 4:30 The trap 5:22 The binary lossless-join test 6:23 Verdict: LOSSY 7:27 The idea: common attribute 8:13 Cut on Teacher instead 9:21 Join the good pieces back: exactly 5 rows, zero spurious 10:08 The idea: split 10:51 The formula 11:41 Building it up: split 12:51 Real GATE question 13:33 Real GATE question: option 14:28 Building it up: topic 15:31 The idea: counter 16:13 All four boxes are reachable 17:39 The common-attribute test is only valid for TWO pieces 19:21 Recap ✅ REAL GATE QUESTIONS SOLVED IN THIS VIDEO • GATE DA 2025 Q16 (answer: C) Har answer official GATE answer key se verify kiya gaya hai. ⬅ PICHHLA VIDEO: Normal Forms — 5 GATE PYQs Solved | GATE DA 2027 in Hindi ➡ AGLA VIDEO: Lossless-Join vs Dependency-Preservation — 5 GATE PYQs Solved | GATE DA 2027 in Hindi 📚 POORA COURSE — 220 videos, syllabus order mein:    • GATE DA 2027 Complete Course in Hindi — Fu...   🎯 GATE DA 2027 ki taiyari kaise shuru karein:    • How to Prepare for GATE DA 2027   ▶ CHANNEL:    / @datarekha   Ye poora course bilkul free hai — har topic, har exercise video. Sabko same level par seekhne aur compete karne ka haq hai.