Good Postgres graphical client for Windows

One option would be to use phpPgAdmin on the server. It’s a web app, but it’s lightweight and easy to install.

It can paginate results, so it can handle large result sets. It can’t do everything that pgAdmin can do, but for everyday use I prefer it.

Use PgAdmin.

However - I don't think you'll find much that won't use a large amount of memory when you have a result set with 1.5 million rows...

PgAdmin has the ability to limit automatically the number of rows returned - so you can get an overview, but not sit for an hour waiting for your results to turn up. If you write a query to return that many rows though, than you are going to have problems.

(You can also look at the limit SQL command, to restrict how many results you get back)

Try official pgAdmin. http://www.pgadmin.org/download/windows.php

NOTE: This is the same answer I gave this duplicate question.

I recommended dbVis. The client runs on Mac, Windows and Linux and supports a variety of database servers, including PostgreSQL.