mysql query to insert code into image description filled in wordpress

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I want to insert <--noads--> tag in my wordpress images description. I have lot of images in media gallery, so I want to get a fast way to add this code with existing description of the images, and I think this is the only way to do this. I'm new to MySQL so can you please provide me code to insert this tag in all images description without loosing already entered data.

i tried :

update wp_posts set post_content =
replace(post_content,'Text to find','text to replace with');
but this code is for find and replace, im new to mysql so unable to modify this code to add text.

 

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I think you are talking about the ALT tag, right?

It sounds like you also want to add the SAME description over and over, correct?

Let me know so I can answer further.