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

Code Example 1

-- Set New Employee Password 
UPDATE employee
SET employee.password = '1234'
WHERE employee.email = '[email protected]';

Code Example 2

UPDATE table_name

SET column1=value, column2=value2,...

WHERE some_column=some_value 

Code Example 3

UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value

Code Example 4

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

Code Example 5

UPDATE table_name
SET variable = 'changed field', variable = 'another changed field'
WHERE firstline_name = 1;

Code Example 6

-- Things in brackets are optional
-- IGNORE modifier updates rows even if errors occur (ie: the rows that cause errors are simply not updated)
UPDATE [IGNORE] table_name 
SET 
    column_name1 = expr1,
    column_name2 = expr2,
    ...
[WHERE 
    condition]; -- WHERE tells us which rows to update based on said condition

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