Some database vendors understood how valuable developers are for them. Others didn’t. And when their products will gradually fade, in favor of free open-source platforms easy to install and use, they will ask themselves why. I’ve seen this in the past and we assist today to another wave. People don’t change…
Most database products ship with some test sample databases you can use for practice. We’ll summaries here the most significant and free example databases from well-known relational database products. Each will be introduced with one or more model diagrams, and a list of tables, with total number of records and the estimated occupied size.
Connect to most popular database types to extract metadata. Generate flexible and dynamic database diagrams with our free Model Xtractor. Export them as Graphviz DOT files. And render them instantly on Graphviz online applications, by simply pasting the content of the exported files.
Visual description of the ROWS, RANGE and GROUPS window function clauses. Understand what frame is selected when used on a set with duplicate values. Get the difference between a current row and a current group. Think in terms of either individual rows, or groups with duplicates. Use offset rows, groups or values.