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Why does adding a JOIN completely modify the query planner behaviour?

score 96 · Answer 1 · 2015-06-08 14:27:03

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Why does adding a JOIN completely modify the query planner behaviour?

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TechQA.

List Question

Why does adding a JOIN completely modify the query planner behaviour?

When dealing with databases, does adding a different table when we can use a simple hash a good thing?

Aggregate and count in PostgreSQL

Rails HABTM: Select everything a that a record 'has'

Trigger using data from inserted row

Select results where joined table contains records with an attribute, but without another

DB candidate as CouchDB/Schema replacement

How do I properly add data in SQLAlchemy?

Postgres in Conda Environment (Ubuntu 14.04)

How to customize the output of the Postgres Pseudo Encrypt function?

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