I was recently performing an analysis on the database for my dissertation software, and wanted to look at one particular set of rows.  The table I was looking at is called Nodes, and because each node (represented by a row in the table) can optionally belong to a group, the ...

I’ve spent the last few blog posts in this series talking about PostgreSQL’s arrays — how to create them, query them, and even create them with the ARRAY function.  But there are cases in which I would like to do the opposite — turn a PostgreSQL array to rows. There ...

So far in this series, I have described how you can create arrays and retrieve information from them — both the actual data stored in the array, and information about the array, such as its length. But the coolest trick, or set of tricks, that I use in PostgreSQL is ...

So far, this series has looked at how to create PostgreSQL arrays, how to retrieve data from them, and how to get the length of an array’s outer and inner dimensions. But one of the most common actions that we’ll want to do with an array is look inside to ...