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add annotation to some examples of comparison clause #2417

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Jan 11, 2024
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add annotation to some examples of comparison clause #2417

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8 changes: 8 additions & 0 deletions docs-2.0-zh/3.ngql-guide/5.operators/1.comparison.md
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Original file line number Diff line number Diff line change
Expand Up @@ -119,20 +119,23 @@ nebula> YIELD 1 != '1';
### `IS [NOT] NULL`

```ngql
# 返回关于 null 的一些判断结果。
nebula> RETURN null IS NULL AS value1, null == null AS value2, null != null AS value3;
+--------+----------+----------+
| value1 | value2 | value3 |
+--------+----------+----------+
| true | __NULL__ | __NULL__ |
+--------+----------+----------+

# 返回关于 NULL 的一些属性信息。
nebula> RETURN length(NULL), size(NULL), count(NULL), NULL IS NULL, NULL IS NOT NULL, sin(NULL), NULL + NULL, [1, NULL] IS NULL;
+--------------+------------+-------------+--------------+------------------+-----------+-------------+------------------+
| length(NULL) | size(NULL) | count(NULL) | NULL IS NULL | NULL IS NOT NULL | sin(NULL) | (NULL+NULL) | [1,NULL] IS NULL |
+--------------+------------+-------------+--------------+------------------+-----------+-------------+------------------+
| __NULL__ | __NULL__ | 0 | true | false | __NULL__ | __NULL__ | false |
+--------------+------------+-------------+--------------+------------------+-----------+-------------+------------------+

# 创建 map 数据，判断 map 的 name 属性是否不为 NULL。
nebula> WITH {name: null} AS `map` \
RETURN `map`.name IS NOT NULL;
+----------------------+
Expand All @@ -141,6 +144,7 @@ nebula> WITH {name: null} AS `map` \
| false |
+----------------------+

# 创建 map1、map2、map3 的数据，并判断返回其 name 属性是否为 NULL。
nebula> WITH {name: 'Mats', name2: 'Pontus'} AS map1, \
{name: null} AS map2, {notName: 0, notName2: null } AS map3 \
RETURN map1.name IS NULL, map2.name IS NOT NULL, map3.name IS NULL;
Expand All @@ -150,6 +154,7 @@ nebula> WITH {name: 'Mats', name2: 'Pontus'} AS map1, \
| false | false | true |
+-------------------+-----------------------+-------------------+

# 查询所有 Tag 为 player 的点数据，判断并返回点的 age 属性是否为 NULL、name 属性是否不为 NULL、empty 属性是否为 NULL。
nebula> MATCH (n:player) \
RETURN n.player.age IS NULL, n.player.name IS NOT NULL, n.player.empty IS NULL;
+----------------------+---------------------------+------------------------+
Expand All @@ -163,20 +168,23 @@ nebula> MATCH (n:player) \
### `IS [NOT] EMPTY`

```ngql
# 判断 null 是否不存在。
nebula> RETURN null IS EMPTY;
+---------------+
| NULL IS EMPTY |
+---------------+
| false |
+---------------+

# 判断 a 字符串是否存在。
nebula> RETURN "a" IS NOT EMPTY;
+------------------+
| "a" IS NOT EMPTY |
+------------------+
| true |
+------------------+

# 遍历所有 player100 指向的目的点，并返回目的点数据 name 属性存在的点 id。
nebula> GO FROM "player100" OVER * WHERE properties($$).name IS NOT EMPTY YIELD dst(edge);
+-------------+
| dst(EDGE) |
Expand Down