ALTER VIEW
Alter the existing view by using another QUERY.
Syntax
ALTER VIEW [db.]view_name AS SELECT query
Examples
CREATE VIEW tmp_view AS SELECT number % 3 AS a, avg(number) FROM numbers(1000) GROUP BY a ORDER BY a;
SELECT * FROM tmp_view;
+------+-------------+
| a    | avg(number) |
+------+-------------+
|    0 |       499.5 |
|    1 |         499 |
|    2 |         500 |
+------+-------------+
ALTER VIEW tmp_view AS SELECT * from numbers(3);
SELECT * FROM tmp_view;
+--------+
| number |
+--------+
|      0 |
|      1 |
|      2 |
+--------+