Answers for "mysql update with where"

update all rows mysql

UPDATE tableName SET columnName = yourValue;
#to update multiple columns:
UPDATE tableName SET column1 = value1, column2 = value2; #and so on

mysql update add to existing value

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

mysql update

UPDATE table_name SET field1 = new-value1, field2 = new-value2
[WHERE Clause]

mysql update set

CREATE TABLE copy LIKE original;

ALTER TABLE copy DISABLE KEYS;
SET unique_checks=0; SET foreign_key_checks=0; 

INSERT INTO copy SELECT * FROM original;

ALTER TABLE copy ENABLE KEYS;
SET unique_checks=1; SET foreign_key_checks=1;