How to delete part of a MySQL database record?

I want to delete part of a record. For example, a column called "message" contains the following string:

"Hi, My name is John"

I want to delete just "John" from开发者_开发技巧 the above while retaining the "Hi, My name is" part in tact.

How can this be done?

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You don't delete anything; the row is updated.

UPDATE table_name SET
message = "Hi, My name is"
WHERE message = "Hi, My name is John"

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This would work:

UPDATE SomeTable SET message = REPLACE(message, "John", "") WHERE id = 123;