Add examples for generated columns (pingcap#9955)

qiancai · Jun 22, 2022 · efe1945 · efe1945
1 parent 23fbb67
commit efe1945
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/generated-columns.md b/generated-columns.md
@@ -47,7 +47,9 @@ CREATE TABLE person (
     id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
     name VARCHAR(255) NOT NULL,
     address_info JSON,
-    city VARCHAR(64) AS (JSON_UNQUOTE(JSON_EXTRACT(address_info, '$.city'))),
+    city VARCHAR(64) AS (JSON_UNQUOTE(JSON_EXTRACT(address_info, '$.city'))), -- 虚拟生成列
+    -- city VARCHAR(64) AS (JSON_UNQUOTE(JSON_EXTRACT(address_info, '$.city'))) VIRTUAL, -- 虚拟生成列
+    -- city VARCHAR(64) AS (JSON_UNQUOTE(JSON_EXTRACT(address_info, '$.city'))) STORED, -- 存储生成列
     KEY (city)
 );
 ```