how to use update and set in mysql code example

Example 1: update table mysql

-- 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

Example 2: how to update rows from a table when certain conditions are met in mysql

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

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