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docs: Update frequently-asked-questions-page.mdx (#14837) 

* Update frequently-asked-questions-page.mdx

refine answer for first question, added SQL Lab query description.

* fix EOL lint

Co-authored-by: Ville Brofeldt <ville.v.brofeldt@gmail.com>
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kurtiswen 2021-11-22 01:36:10 +08:00 committed by GitHub
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docs/src/pages/docs/frequently-asked-questions-page.mdx
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@ -24,6 +24,9 @@ will do its own _GROUP BY_ and doing the work twice might slow down performance.
Whether you use a table or a view, the important factor is whether your database is fast enough to
serve it in an interactive fashion to provide a good user experience in Superset.
However, if you are using the SQL Lab, there is no such limitation, you can write sql query to join
multiple tables as long as your db account has access to the tables.
### How BIG can my datasource be?
It can be gigantic! Superset acts as a thin layer above your underlying databases or data engines.