Jatuhkan pernyataan SELECT, tidak perlu, cukup gunakan nilai saat ini:
UPDATE some_table SET
column_1 = COALESCE(param_1, column_1),
column_2 = COALESCE(param_2, column_2),
column_3 = COALESCE(param_3, column_3),
column_4 = COALESCE(param_4, column_4),
column_5 = COALESCE(param_5, column_5)
WHERE id = some_id;