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

Code Example 1

UPDATE table_name
SET column1 = value1, column2 = value2
WHERE condition <= condition AND condition != condition;

Code Example 2

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

Code Example 3

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

Code Example 4

-- 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

Code Example 5

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

Code Example 6

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

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