alter table mysql
ALTER TABLE contacts
ADD last_name varchar(40) NOT NULL
AFTER contact_id,
ADD first_name varchar(35) NULL
AFTER last_name;alter table mysql
ALTER TABLE contacts
ADD last_name varchar(40) NOT NULL
AFTER contact_id,
ADD first_name varchar(35) NULL
AFTER last_name;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 conditionalter table query in mysql
ALTER TABLE `employees`CHANGE `emp_id` `emp_id` int(11) NULL;Copyright © 2021 Codeinu
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