How to add drop down filter for all panels where the data is getting collected from different table from postgres

[mattabrams]

welcome to the forum, @pawanyadav

It sounds like you want to use chained variables. Here are some useful starting points and example dashboards in our public sandbox

• example dashboard
• chained variables docs
• variables
• variable examples

Here are the docs on template variables. And here is a list of good examples on play.grafana.org that use template variables. You can inspect each dashboard to see just how the variables are constructed.