Using MySQL UPDATE statement you can update existing data in a table. it can be a single column or multiple rows.
UPDATE users SET user_address = 'Kolkata, India', user_state = 'WB' WHERE user_id = 247
You can also update fields depends on JOIN query on two or more tables.
UPDATE users INNER JOIN score ON user.score_value = score.score_value SET rank = rank * score_value
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