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列表运算符

Nebula Graph支持使用列表(List)运算符进行运算。支持的运算符如下。

名称 说明
+ 连接列表。
IN 元素是否存在于列表中。
[] 使用下标操作符访问列表中的元素。

示例

nebula> YIELD [1,2,3,4,5]+[6,7] AS myList;
+-----------------------+
| myList                |
+-----------------------+
| [1, 2, 3, 4, 5, 6, 7] |
+-----------------------+

nebula> RETURN size([NULL, 1, 2]);
+------------------+
| size([NULL,1,2]) |
+------------------+
| 3                |
+------------------+

nebula> RETURN NULL IN [NULL, 1];
+--------------------+
| (NULL IN [NULL,1]) |
+--------------------+
| true               |
+--------------------+

nebula> WITH [2, 3, 4, 5] AS numberlist \
    UNWIND numberlist AS number \
    WITH number \
    WHERE number IN [2, 3, 8] \
    RETURN number;
+--------+
| number |
+--------+
| 2      |
+--------+
| 3      |
+--------+

nebula> WITH ['Anne', 'John', 'Bill', 'Diane', 'Eve'] AS names RETURN names[1] AS result;
+--------+
| result |
+--------+
| "John" |
+--------+

最后更新: 2021年3月23日