how to update a column in mysql code example

Example 1: mysql update query

UPDATE table_name SET field1 = 'value 1', field2 = 'value 2'
WHERE field3 = 'value 3'

Example 2: update all rows mysql

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

Example 3: update column mysql with alter

ALTER TABLE table_name
  MODIFY column_name column_definition
    [ FIRST | AFTER column_name ];

Example 4: change column in mysql

#Alter is used
#alter table TableName change CurrentColumnName NewColumnName Specification(size);
alter table TableName change name firstname varchar(30);