From de10062a0cdbe7db638bcb04559c1d7b9e0bf13a Mon Sep 17 00:00:00 2001
From: "max.zhu@vesoft.com" <86282370+izhuxiaoqing@users.noreply.github.com>
Date: Mon, 18 Oct 2021 15:02:10 +0800
Subject: [PATCH] Update 4.fetch.md (#811)

* Update 4.fetch.md

* Update 4.fetch.md
---
 .../7.general-query-statements/4.fetch.md           | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/docs-2.0/3.ngql-guide/7.general-query-statements/4.fetch.md b/docs-2.0/3.ngql-guide/7.general-query-statements/4.fetch.md
index b7dc66c916b..5e56cac9f5d 100644
--- a/docs-2.0/3.ngql-guide/7.general-query-statements/4.fetch.md
+++ b/docs-2.0/3.ngql-guide/7.general-query-statements/4.fetch.md
@@ -1,5 +1,7 @@
 # FETCH
 
+<!-- This topic needs to be modified after compulsory use of YIELD in 3.0. Refer to https://confluence.nebula-graph.io/pages/viewpage.action?pageId=10723963 -->
+
 The `FETCH` statement retrieves the properties of the specified vertices or edges.
 
 ## OpenCypher Compatibility
@@ -13,7 +15,7 @@ This topic applies to native nGQL only.
 ```ngql
 FETCH PROP ON {<tag_name>[, tag_name ...] | *} 
 <vid> [, vid ...] 
-[YIELD <output>]
+[YIELD <return_list> [AS <alias>]]; 
 ```
 
 |Parameter|Description|
@@ -21,7 +23,8 @@ FETCH PROP ON {<tag_name>[, tag_name ...] | *}
 |`tag_name`|The name of the tag.|
 |`*`|Represents all the tags in the current graph space.|
 |`vid`|The vertex ID.|
-|`output`|Specifies the information to be returned. For more information, see [`YIELD`](../8.clauses-and-options/yield.md). If there is no `YIELD` clause, `FETCH` returns all the matched information.|
+|`YIELD`|Define the output to be returned. The defined properties and `VertexID` are returned. For details, see [`YIELD`](../8.clauses-and-options/yield.md). If there is no `YIELD` clause, `vertices_` is returned by default, which contains all the information about the vertex. |
+|`AS`| Set an alias.|
 
 ### Fetch vertex properties by one tag
 
@@ -42,9 +45,9 @@ Use a `YIELD` clause to specify the properties to be returned.
 
 ```ngql
 nebula> FETCH PROP ON player "player100" \
-        YIELD player.name;
+        YIELD player.name AS name;
 +-------------+--------------+
-| VertexID    | player.name  |
+| VertexID    | name         |
 +-------------+--------------+
 | "player100" | "Tim Duncan" |
 +-------------+--------------+
@@ -132,7 +135,7 @@ FETCH PROP ON <edge_type> <src_vid> -> <dst_vid>[@<rank>] [, <src_vid> -> <dst_v
 |`src_vid`|The VID of the source vertex. It specifies the start of an edge.|
 |`dst_vid`|The VID of the destination vertex. It specifies the end of an edge.|
 |`rank`|The rank of the edge. It is optional and defaults to `0`. It distinguishes an edge from other edges with the same edge type, source vertex, destination vertex, and rank.|
-|`output`|Specifies the information to be returned. For more information, see [`YIELD`](../8.clauses-and-options/yield.md). If there is no `YIELD` clause, `FETCH` returns all the matched information.|
+|`YIELD`|Define the output to be returned. The defined properties, `SrcVertexID`, `DstVertexID`, and `rank` are returned. For details, see [`YIELD`](../8.clauses-and-options/yield.md). If there is no `YIELD` clause, `edges_` is returned by default, which contains all the information about the edge. |
 
 ### Fetch all properties of an edge