From 15c3bc840f20e5538ec5eb837faeb4c09d5f4a43 Mon Sep 17 00:00:00 2001
From: randomJoe211 <69501902+randomJoe211@users.noreply.github.com>
Date: Wed, 25 May 2022 11:26:07 +0800
Subject: [PATCH] Update 9.type-conversion.md

---
 docs-2.0/3.ngql-guide/3.data-types/9.type-conversion.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs-2.0/3.ngql-guide/3.data-types/9.type-conversion.md b/docs-2.0/3.ngql-guide/3.data-types/9.type-conversion.md
index ebe7f8f3f41..103b065d73c 100644
--- a/docs-2.0/3.ngql-guide/3.data-types/9.type-conversion.md
+++ b/docs-2.0/3.ngql-guide/3.data-types/9.type-conversion.md
@@ -9,6 +9,7 @@
 | toBoolean() | 将字符串转换为布尔。 |
 | toFloat() | 将整数或字符串转换为浮点数。 |
 | toInteger() | 将浮点或字符串转换为整数。|
+| toString() | 将非复合类型的数据，例如数字、布尔值等，转换为字符串。|
 | toSet()   |将列表或集合转换为集合。|
 | type() |  返回字符串格式的关系类型。  |
 
@@ -72,6 +73,13 @@ nebula> MATCH (n:player) \
 | 2     |
 +-------+
 
+nebula> RETURN toString(9669) AS int2str, toString(null) AS null2str;
++---------+----------+
+| int2str | null2str |
++---------+----------+
+| "9669"  | __NULL__ |
++---------+----------+
+
 nebula> RETURN toSet(list[1,2,3,1,2]) AS list2set;
 +-----------+
 | list2set  |