eolas/Databases/SQL/5_UPDATE.md

categories	tags
Databases Programming_Languages	SQL

SQL: The UPDATE query

With UPDATE we modify existing records.

Schematic syntax

UPDATE [table_name]
SET [field]
WHERE [conditional expression/filter]

Real example

UPDATE manufacturer
SET url = '<http://www.hp.co.uk>'
WHERE manufacturer_id = 4; --typically this will be the primary key as you are updating and existing record and need to identify it uniquely

Multiple fields

UPDATE manufacturer
SET url = '<http://www.apple.co.uk>',
    year_founded = 1977
WHERE manufacturer_id = 2;