PostgreSQL
SQL Union – What is a Union and how to combine two or more SQL Select queries
Updated 1st December 2023
The SQL UNION Operator is used to combine two or more SELECT statements together into one set of results. Things to know about SQL Union Operator To execute a SQL UNION statement successfully, you need to be away of the requirements of a UNION statement. Example using SQL UNION In our example we have 2
How to transform geometries with PostGIS
Updated 2nd October 2023
PostGIS is a power extention for PostgreSQL databases. It provides a suite of tools to handle and manipulate geographic data. At times, you may need to transform geometries with PostGIS for different base maps or to perform more accurate calculations, such as calculating the area of a polygon. Transform geometry with PostGIS PostGIS has a
How to install PostGIS
Updated 2nd October 2023
PostGIS is a plugin which adds support for storing, indexing and querying geographic data in PostgreSQL databases. To get started with PostGIS, you will need to install the extension on your PostgreSQL database. If you are using PostgreSQL as a service from a cloud provider, you may already have PostGIS installed. How to check if