[mysql] Set value to NULL in MySQL

I want a value to be set to NULL if nothing is put into the text box in the form I'm submitting. How can I make this happen? I've tried inserting 'NULL' but this just adds the word NULL into the field.

I'm not sure what code I should provide for this, I'm just writing an UPDATE query.

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Source: Stackoverflow.com

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[mysql] Set value to NULL in MySQL

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