11 lines
780 B
Markdown
11 lines
780 B
Markdown
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# Query optimizations
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There are some tricks to consider when using the SQL API that might make your application a little faster.
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* Only request the fields you need. Selecting all columns will return a full version of your geometry in *the_geom* as well as a reprojected version in *the_geom_webmercator*.
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* Use PostGIS functions to simplify and filter out unneeded geometries when possible. One very handy function is, [ST_Simplify](http://www.postgis.org/docs/ST_Simplify.html).
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* Remember to build indexes that will speed up some of your more common queries.
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* Use *cartodb_id* to retrieve specific rows of your data, this is the unique key column added to every CartoDB table.
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<!-- TODO: Link to http://blog.cartodb.com/post/53301057653/faster-data-updates-with-cartodb -->
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