From 253056ca535875ca549cc3f2db4b706561d8d8cd Mon Sep 17 00:00:00 2001
From: EmmyMiao87 <522274284@qq.com>
Date: Mon, 22 Mar 2021 10:50:55 +0800
Subject: [PATCH] [Docs] Modify schema change sql reference (#5530)

Modify the error examples
---
 .../sql-statements/Data Definition/ALTER TABLE.md            | 5 +++--
 .../sql-statements/Data Definition/ALTER TABLE.md            | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/docs/en/sql-reference/sql-statements/Data Definition/ALTER TABLE.md b/docs/en/sql-reference/sql-statements/Data Definition/ALTER TABLE.md
index 07a5a29eaf..0ddd8729c7 100644
--- a/docs/en/sql-reference/sql-statements/Data Definition/ALTER TABLE.md	
+++ b/docs/en/sql-reference/sql-statements/Data Definition/ALTER TABLE.md	
@@ -318,9 +318,10 @@ under the License.
         DROP COLUMN col2
         FROM example_rollup_index;
         
-    7. Modify the base index's col1 column to be of type BIGINT and move to the col2 column
+    7. Modify the base index's col1 key column to be of type BIGINT and move to the col2 column
+       (*Attention: Whether to modify the key column or the value column, complete column information need to be declared. For example, MODIFY COLUMN xxx COLUMNTYPE [KEY|agg_type]*)
         ALTER TABLE example_db.my_table
-        MODIFY COLUMN col1 BIGINT DEFAULT "1" AFTER col2;
+        MODIFY COLUMN col1 BIGINT KEY DEFAULT "1" AFTER col2;
 
     8. Modify the maximum length of the val1 column of the base index. The original val1 is (val1 VARCHAR(32) REPLACE DEFAULT "abc")
         ALTER TABLE example_db.my_table
diff --git a/docs/zh-CN/sql-reference/sql-statements/Data Definition/ALTER TABLE.md b/docs/zh-CN/sql-reference/sql-statements/Data Definition/ALTER TABLE.md
index e98672346c..9e5d2754c9 100644
--- a/docs/zh-CN/sql-reference/sql-statements/Data Definition/ALTER TABLE.md	
+++ b/docs/zh-CN/sql-reference/sql-statements/Data Definition/ALTER TABLE.md	
@@ -316,9 +316,10 @@ under the License.
         DROP COLUMN col2
         FROM example_rollup_index;
         
-    7. 修改 base index 的 col1 列的类型为 BIGINT，并移动到 col2 列后面
+    7. 修改 base index 的 key 列 col1 的类型为 BIGINT，并移动到 col2 列后面
+       (*注意，无论是修改 key 列还是 value 列都需要声明完整的 column 信息*) 例如：MODIFY COLUMN xxx COLUMNTYPE [KEY|agg_type] 
         ALTER TABLE example_db.my_table
-        MODIFY COLUMN col1 BIGINT DEFAULT "1" AFTER col2;
+        MODIFY COLUMN col1 BIGINT KEY DEFAULT "1" AFTER col2;
 
     8. 修改 base index 的 val1 列最大长度。原 val1 为 (val1 VARCHAR(32) REPLACE DEFAULT "abc")
         ALTER TABLE example_db.my_table