Save data from retool column to mysql column


I have editable column in my table, and i want to take value entered by a user and save it mysql, so the value would be kept and wont be left empty after page is refreshed. No i have this query: UPDATE
user_notes = {{table.selectedRow.user_notes}}
name = {{}}

which is being triggered with a button save. But the values are not being saved. Table displays data from sql.

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how do you do to query in sql in a massive way the data of all the rows of a column you have in a table ?