mysql insert exists update
INSERT INTO table (column_list) VALUES (value_list) ON DUPLICATE KEY UPDATE c1 = v1, c2 = v2, ...;
mysql insert exists update
INSERT INTO table (column_list) VALUES (value_list) ON DUPLICATE KEY UPDATE c1 = v1, c2 = v2, ...;
mysql insert into if not exists
INSERT INTO table_name (firstname, lastname) SELECT 'NEW FIRSTNAME', 'NEW LASTNAME' FROM DUAL WHERE NOT EXISTS( SELECT 1 FROM table_name WHERE firstname = 'NEW FIRSTNAME' AND lastname = 'NEW LASTNAME' ) LIMIT 1;
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