can we read data from database?

Projects General Guidance
1

can we read data from database and can we display on arduino serial monitor?

2

can we read data from database and can we display on arduino serial monitor?

With the right hardware, the right scripts on the server, the right sketch on the Arduino, and a USB cable between the Arduino and a PC, yes.

3

if u have any example codes regarding this can u post here or else can u post a link where can i get the information regarding this.

4

Any example code I have would be useless for you. Re-read what I said. Describe what you actually have - hardware, server, database, scripts, etc.