docs: update sql docs (#3126)

4paradigm · Mar 22, 2023 · 7d429c6 · 7d429c6
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diff --git a/docs/en/reference/sql/dml/DELETE_STATEMENT.md b/docs/en/reference/sql/dml/DELETE_STATEMENT.md
@@ -12,8 +12,8 @@ TableName ::=
 
 **Description**
 
-`DELETE` statement will delete all data from the first index of specific column value. 
-
+- `DELETE` statement will delete all data from the index of specific column value of online table.
+- The filter columns sepcified by `WHERE` must be an index column and the condition can only be `=`.
 
 ## Examples
 

diff --git a/docs/en/reference/sql/dml/INSERT_STATEMENT.md b/docs/en/reference/sql/dml/INSERT_STATEMENT.md
@@ -14,6 +14,9 @@ value_list:
     value [, value] ...
 ```
 
+**Description**
+- `INSERT` statement only works in online execute mode
+
 ## Examples
 
 ```SQL

diff --git a/docs/zh/openmldb_sql/dml/DELETE_STATEMENT.md b/docs/zh/openmldb_sql/dml/DELETE_STATEMENT.md
@@ -12,7 +12,8 @@ TableName ::=
 
 **说明**
 
-`DELETE` 语句删除指定列的索引下面对应值的所有数据。
+- `DELETE` 语句删除在线表指定列的索引下面对应值的所有数据
+- `WHERE` 指定的筛选列必须是索引列并且只能是等于
 
 ## Examples
 

diff --git a/docs/zh/openmldb_sql/dml/INSERT_STATEMENT.md b/docs/zh/openmldb_sql/dml/INSERT_STATEMENT.md
@@ -14,6 +14,9 @@ value_list:
     value [, value] ...
 ```
 
+**说明**
+- `INSERT` 只能用在在线模式
+
 ## Examples
 
 ```SQL