Advanced Queries

Multi-table Join


The plots table in the Portal database can be joined to the surveys table by joining plot_id to plot_id and the species table can be joined to the surveys table by joining species_id to species_id.

The Portal mammal data include data from a number of different experimental manipulations. You want to do a time-series analysis of the population dynamics of all of the species at the site, taking into account the different experimental manipulations. Write a query that returns the year, month, day, genus and species of every individual as well as the plot_id and plot_type of the plot they are captured on. Save this query as species_plot_data.

[click here for output]