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If I have a view on a view on a view (etc.), is there a way to show the full query that this expands/flattens to?

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migrated from May 12 '13 at 0:04

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Just use explain or explain analyze on the main query. Views are merged/melted into the main query plan. – wildplasser May 11 '13 at 17:17
I mean I want to see SQL, not the query plan. – jl6 May 11 '13 at 17:18
I don't think you can do that. – wildplasser May 11 '13 at 17:20
up vote 3 down vote accepted

Not in PostgreSQL at this time. PostgreSQL doesn't actually build a single giant SQL statement; instead, it uses the plan tree of the view(s) and inserts that into the top level query's plan tree. To turn that back into SQL would require a deparser, something PostgreSQL doesn't have a the moment.

You can kind-of do-it-yourself by replacing references to the view with the text of the view query, but you need to understand that the effect isn't exactly the same, particularly where there are multiple references to the view.

You're best off using explain and/or explain analyze to observe what the query does.

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