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csobier 2017-02-13 17:31:21 -05:00 committed by GitHub
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doc/making_calls.md
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# Making Calls to the SQL API
CARTO is based on the rock solid PostgreSQL database. All of your tables reside a single database, which means you can perform complex queries joining tables, or carrying out geospatial operations. The best place to learn about PostgreSQL's SQL language is the [official documentation](http://www.postgresql.org/docs/9.1/static/).
CARTO is based on the rock solid PostgreSQL database. All of your tables reside in a single database, which means you can perform complex queries joining tables, or carrying out geospatial operations. The best place to learn about PostgreSQL's SQL language is the [official documentation](http://www.postgresql.org/docs/9.1/static/).
CARTO is also based on PostGIS, so you can view the [official PostGIS reference](http://postgis.refractions.net/docs/) to know what functionality we support in terms of geospatial operations. All of our tables include a column called *the_geom,* which is a geometry field that indexes geometries in the EPSG:4326 (WGS 1984) coordinate system. All tables also have an automatically generated and updated column called *the_geom_webmercator*. We use the column internally to quickly create tiles for maps.