ALTER VIEW

通过使用另一个 QUERY 来修改现有的视图。

语法

ALTER VIEW [ <database_name>. ]view_name [ (<column>, ...) ] AS SELECT query

示例

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 |       499.0 |
|    2 |       500.0 |
+------+-------------+

ALTER VIEW tmp_view(c1) AS SELECT * from numbers(3);

SELECT * FROM tmp_view;
+------+
| c1   |
+------+
|    0 |
|    1 |
|    2 |
+------+