What Is a Database Index? Seq Scan vs Index Scan on 200,000 Rows (PostgreSQL EXPLAIN)

What Is a Database Index? Seq Scan vs Index Scan on 200,000 Rows (PostgreSQL EXPLAIN)

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B-Tree Equality vs Range Scans: Index Scan, Bitmap Heap Scan or Seq Scan? (PostgreSQL EXPLAIN)
B-Tree Equality vs Range Scans: Index Scan, Bitmap Heap Scan or Seq Scan? (PostgreSQL EXPLAIN)
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B-Tree Equality vs Range Scans: Index Scan, Bitmap Heap Scan or Seq Scan? (PostgreSQL EXPLAIN)

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