引用符Graph

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Graph

引用符仅适用于nGQL扩展。

引用符列表Graph

引用符	说明
$^	引用起始点。更多信息请参见Graph。
$$	引用目的点。更多信息请参见Graph。
$-	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Graph。

示例Graph

# 返回起始点和目的点的年龄。
nebula> GO FROM "player100" OVER follow YIELD $^.player.age AS SrcAge, $$.player.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 follow._dst AS id | \
        GO FROM $-.id OVER serve \
        YIELD $^.player.name AS Player, $$.team.name AS Team;
+-----------------+-----------+
| Player          | Team      |
+-----------------+-----------+
| "Tony Parker"   | "Spurs"   |
+-----------------+-----------+
| "Tony Parker"   | "Hornets" |
+-----------------+-----------+
| "Manu Ginobili" | "Spurs"   |
+-----------------+-----------+

---

最后更新: 2021年7月15日