gda-sql-5.0: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/debug/usr/bin/gda-sql-5.0 - from package: libgda-5.0-4-dbg
/usr/bin/gda-sql-5.0 - from package: libgda-5.0-bin

You may install the required package with command apt-get install {package}
Error in other languages:
gda-sql-5.0: bevel nie gevind nie
gda-sql-5.0: comandă negăsită
gda-sql-5.0: comando não encontrado
gda-sql-5.0: commande introuvable
gda-sql-5.0: command not found
gda-sql-5.0: käsku ei ole
gda-sql-5.0: không tìm thấy lệnh
gda-sql-5.0: komanda nerasta
gda-sql-5.0: Kommando nicht gefunden.
gda-sql-5.0: kommandot finns inte
gda-sql-5.0: komut yok
gda-sql-5.0: nie znaleziono polecenia
gda-sql-5.0: níor aimsíodh an t-ordú
gda-sql-5.0: no se encontró la orden
gda-sql-5.0: no s'ha trobat l'ordre
gda-sql-5.0: opdracht niet gevonden
gda-sql-5.0: parancs nem található
gda-sql-5.0: perintah tidak ditemukan
gda-sql-5.0: príkaz nenájdený
gda-sql-5.0: příkaz nenalezen
gda-sql-5.0: команда не найдена
gda-sql-5.0: командата не е открита
gda-sql-5.0: 命令找不到
gda-sql-5.0: コマンドが見つかりません