MySQL : MySQL 'ERROR 1046 (3D000): No database selected' on update query

MySQL : MySQL "ERROR 1046 (3D000): No database selected" on update query
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

Let me give you a quick introduction about myself,
Hey there, I am Delphi, pleased to make your acquaintance.
I am willing to help you find the solutions to your questions.
MySQL : MySQL "ERROR 1046 (3D000): No database selected" on update query
Let me know if you have more specific queries by commenting or chatting with me.
If you have an answer, or any insights to the answer, please comment below.
Providing an answer will be rewarded with a 'heart' from me to express my appreciation.
selected" update MySQL : No database 1046 (3D000): query "ERROR on MySQL