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mediumDSA

JSONB querying and GIN indexing — how do you query and index schemaless data efficiently?

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01

Understand the problem

Use @>, ->, ->>, ?, and GIN with jsonb_path_ops vs default ops for containment vs path extraction.

jsonbgin-indexpostgres
02

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Sketch your approach before reading the solution — that's what interviews test.

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03

Study the solution

Store as JSONB (binary, indexable). Use @> for containment (“contains this JSON”), ->/->> for path extraction, and ? for key existence. Index with GIN — jsonb_path_ops is smaller/faster for @> only; default jsonb_ops supports @>, ?, ?&.

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04

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