default value supports expression (#1838)

Co-authored-by: dangleptr <37216992+dangleptr@users.noreply.github.com>
vesoft-inc · Feb 28, 2020 · 3208cab · 3208cab
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diff --git a/...guage/4.statement-syntax/1.data-definition-statements/create-tag-edge-syntax.md b/...guage/4.statement-syntax/1.data-definition-statements/create-tag-edge-syntax.md
@@ -47,7 +47,7 @@ CREATE {TAG | EDGE} [IF NOT EXISTS] {<tag_name> | <edge_name>}
 
 * **默认值约束**
 
-  您可以在创建标签/边时使用 `DEFAULT` 约束设置属性的默认值。如果没有指定其他值，那么会将默认值插入新的顶点或边。如果您不想使用默认值，也可以写一个用户指定的值。
+  您可以在创建标签/边时使用 `DEFAULT` 约束设置属性的默认值。如果没有指定其他值，那么会将默认值插入新的顶点或边。默认值可以为 **Nebula Graph** 支持的任一数据类型，且支持表达式。如果您不想使用默认值，也可以写一个用户指定的值。
 
   > 暂时不支持使用 `Alter` 更改默认值。
 

diff --git a/...guage/4.statement-syntax/1.data-definition-statements/create-tag-edge-syntax.md b/...guage/4.statement-syntax/1.data-definition-statements/create-tag-edge-syntax.md
@@ -47,7 +47,7 @@ You can use the `If NOT EXISTS` keywords when creating tags or edges. This keywo
 
 * **Default Constraint**
 
-    You can set the default value of a property when creating a tag/edge with the `DEFAULT` constraint. The default value will be added to all new vertices and edges IF no other value is specified. Also you can write a user-specified value if you don't want to use the default one.
+    You can set the default value of a property when creating a tag/edge with the `DEFAULT` constraint. The default value will be added to all new vertices and edges if no other value is specified. The default value can be any of the data type supported by  **Nebula Graph** or  expressions. Also you can write a user-specified value if you don't want to use the default one.
 
     > Using `Alter` to change the default value is not supported.