We would like to understand how the data is made available in the below tables. And why there are some investments (in inv_investments table) for which there are no corresponding records in these tables.
prj_baseline_details
prj_baselines
Version: 15.8
These two are tables related with the Baselines. If an investment does not hold any baselines then no data would be available against either prj_baselines or prj_baseline_details table for that investment.
We can check if there are any baselines against a project by navigating to Home -> Project -> {Specific Project} -> Properties -> Baseline subpage. A sample screenshot is below.