update query on multiple tables in mysql code example

Example 1: mysql update two tables at once

UPDATE t1 LEFT JOIN t2 ON t1.id = t2.f_key
   SET t1.value = t1.value + 1,
       t2.value = t2.value + 1
 WHERE t1.id = condition

Example 2: mysql update multiple rows with different values

UPDATE config
   SET config_value = CASE config_name 
                      WHEN 'name1' THEN 'value' 
                      WHEN 'name2' THEN 'value2' 
                      ELSE config_value
                      END
 WHERE config_name IN('name1', 'name2');

Example 3: mysql update one table from another table multiple columns

update  tabe2 set subject_id = (SELECT GROUP_CONCAT(sub_id SEPARATOR ', ') as sub_id FROM tabe1)

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Sql Example

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