Question

so suppose there’s a table:

id column1 column2

 1   333     4444

Where id is a primary key

And then I do

REPLACE INTO table (id, column2) VALUES (1, 55)

This will cause column1 to become null…is there a way to specify the query such that it will leave whatever existing value of column1 is when REPLACE matches an existing entry?

Answer 1

Use INSERT ... ON DUPLICATE KEY UPDATE:

INSERT INTO table (id, column2) VALUES (1, 55)
ON DUPLICATE KEY UPDATE column2 = VALUES(column2)