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content/post/ch-liveview.md

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+---
+title: "ClickHouse 视图之 Live View"
+date: 2020-10-08T19:05:00+08:00
+lastmod: 2020-10-08T19:05:00+08:00
+tags: []
+categories: ["clickhouse"]
+---
+
+# Live View 视图简介
+- 类似时间监听器
+- 需设置 allow_experimental_live_view 为 1，检查
+    ```sql
+    SELECT name, value FROM system.settings WHERE name LIKE '%live_view%';
+    ```
+
+# 创建 Live View 视图
+- 创建
+    ```sql
+    CREATE LIVE VIEW lv_name AS SELECT count(*) FROM table_name;
+    ```
+
+- 监听
+    ```sql
+    WATCH lv_name
+    ```
+