引用符¶
nGQL 提供引用符来表示WHERE
和YIELD
子句中的属性,或者复合查询中管道符之前的语句输出结果。
openCypher 兼容性¶
引用符仅适用于原生 nGQL。
引用符列表¶
引用符 | 说明 |
---|---|
$^ |
引用起始点。更多信息请参见引用属性。 |
$$ |
引用目的点。更多信息请参见引用属性。 |
$- |
引用复合查询中管道符之前的语句输出结果。更多信息请参见管道符。 |
示例¶
# 返回起始点和目的点的年龄。
nebula> GO FROM "player100" OVER follow YIELD properties($^).age AS SrcAge, properties($$).age AS DestAge;
+--------+---------+
| SrcAge | DestAge |
+--------+---------+
| 42 | 36 |
| 42 | 41 |
+--------+---------+
# 返回 player100 追随的 player 的名称和团队。
nebula> GO FROM "player100" OVER follow \
YIELD dst(edge) AS id | \
GO FROM $-.id OVER serve \
YIELD properties($^).name AS Player, properties($$).name AS Team;
+-----------------+-----------+
| Player | Team |
+-----------------+-----------+
| "Tony Parker" | "Spurs" |
| "Tony Parker" | "Hornets" |
| "Manu Ginobili" | "Spurs" |
+-----------------+-----------+
最后更新:
September 4, 2023