How to delete external app from LaunchPad?

• For external application that displayed at LaunchPad, long click doesn't called up the cross symbol to allow the user to delete away the app.
• Below are some alternative way that I have come across from internet that might be useful
• Launch the "Terminal" window

# cd ~/Library/Application\ Support/Dock
# ls

• By listing the files in the folder, you will be able to find the database file
• Run the command below to delete away the application from LaunchPad

# sqlite3 [DATABASENAME].db "DELETE from apps WHERE title='[APPNAME]';"

[DATABASENAME] represent the database name that we discovered at previous steps
[APPNAME] represent the name of the app

• Run the command below to restart the launchpad. Voila, the external application is removed from LaunchPad.

# killall Dock