1. Modify all data
UPDATE table_name
SET {col_name = EXPRESSION}[,...n]
Example 1: Change all users gender to male
UPDATE users SET user_sex = '男'
Example 2: Increase all game scores of all players by 100 points
UPDATE scores SET score = score+100
2. Modify the characteristic data
UPDATE table_name SET {col_name = expression}[,...n] WHERE condition_expression
Example: Change the gender of players whose QQ is "12302" to female.
UPDATE users SET user_sex = "女" WHERE user_qq = "12302"