Check out example codes for "mysql change value". It will help you in understanding the concepts better.

Code Example 1

mysql> UPDATE tableName SET sometotal = sometotal+10 WHERE Id = 4;

Code Example 2

UPDATE [LOW_PRIORITY] [IGNORE] table_name 
SET 
    column_name1 = expr1,
    column_name2 = expr2,
    ...
[WHERE
    condition];

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