MySQL：使用不同的条件更新不同的列

Question

Please how can I update different columns base on different and specific conditions. For example:

UPDATE table
SET col1 = val1 WHERE col1 > 2
SET col2 = val2 WHERE col2 > 1

Is is possible to write an SQL UPDATE statement like this Where different columns will be updated base on separate conditions?

Answer 1

Use case :

UPDATE table
    SET col1 = (CASE WHEN col1 > 2 THEN val1 ELSE col1 END),
        col2 = (CASE WHEN col2 > 1 THEN val2 ELSE col2 END);

You can also add WHERE col1 > 2 or col2 > 1 so MySQL does not attempt to update all rows.