MySQL : MySQL Syntax error message 'Operand should contain 1 column(s)'

MySQL : MySQL Syntax error message "Operand should contain 1 column(s)"
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on your keyboard as the next step.
The progress bar on YouTube will be altered to a flashing rainbow.

A brief introduction of myself,
Howdy, my name's Delphi.
I am available to help you find solutions to your inquiries.
MySQL : MySQL Syntax error message "Operand should contain 1 column(s)"
Let me know if you have more specific questions or concerns by leaving a comment or starting a chat.
Please feel free to leave a comment below if you have an answer or insights on the answer.
I will express my appreciation for your answer by 'hearting' it.
MySQL message : "Operand MySQL error 1 should column(s)" Syntax contain