Navicat for PostgreSQL is an easy-to-use graphical tool for PostgreSQL database development. From writing simple SQL queries to developing complex databases, Navicat for PostgreSQL is designed to accommodate a wide range of users, from PostgreSQL beginners to seasoned developers... (
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The program works with the following extensions: 
nppt, 
nppb, 
nppd, 
nppe, 
nppi, 
nppj, 
nppeq and 
nppev