Updating data, UPDATE operator

To edit existing records in tables, there is an SQL operator UPDATE.

General query structure with the UPDATE operator

MySQL 8.1
UPDATE table_name
SET table_field1 = table_field_value1,
    table_fieldN = table_field_valueN
[WHERE the_conditions_of_the_limitations]

So, for example, if you need to change the name, the request will look like this:

MySQL 8.1
UPDATE FamilyMembers
SET member_name = "Andie Anthony"
WHERE member_name = "Andie Quincey";

member_id	status	member_name	birthday
1	father	Headley Quincey	1960-05-13T00:00:00.000Z
2	mother	Flavia Quincey	1963-02-16T00:00:00.000Z
3	varchar(50)	Andie Anthony	1983-06-05T00:00:00.000Z
4	daughter	Lela Quincey	1985-06-07T00:00:00.000Z
5	daughter	Annie Quincey	1988-04-10T00:00:00.000Z
6	father	Ernest Forrest	1961-09-11T00:00:00.000Z
7	mother	Constance Forrest	1968-09-06T00:00:00.000Z
8	daughter	Wednesday Addams	2005-01-13T00:00:00.000Z

Be careful when updating data. If you skip the WHERE operator, all entries will be updated.

In data update requests, you can change values based on previous values.

MySQL 8.1
UPDATE Payments
SET unit_price = unit_price * 2;

It is also allowed to assign values of some columns to other columns. But at the same time, of course, column types must be compatible.