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add annotation to some examples of LOOKUP clause #2388

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Dec 6, 2023
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add annotation to some examples of LOOKUP clause #2388

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41e9d82
add annotation to some examples of `LOOKUP` clause
knqiufan Dec 5, 2023
305b7c1
Update 5.lookup.md
abby-cyber Dec 6, 2023
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25 changes: 23 additions & 2 deletions docs-2.0-zh/3.ngql-guide/7.general-query-statements/5.lookup.md
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Original file line number Diff line number Diff line change
Expand Up @@ -69,15 +69,18 @@ YIELD [DISTINCT] <return_list> [AS <alias>]
返回 Tag 为`player`且`name`为`Tony Parker`的点。

```ngql
# 创建 Tag 为 player 的复合属性索引 index_player。
nebula> CREATE TAG INDEX IF NOT EXISTS index_player ON player(name(30), age);

# 重建复合属性索引 index_player，返回任务 id。
nebula> REBUILD TAG INDEX index_player;
+------------+
| New Job Id |
+------------+
| 15 |
+------------+

# 返回所有 name 等于 Tony Parker 的点数据的 ID。
nebula> LOOKUP ON player \
WHERE player.name == "Tony Parker" \
YIELD id(vertex);
Expand All @@ -87,6 +90,7 @@ nebula> LOOKUP ON player \
| "player101" |
+---------------+

# 查询所有 name 等于 Tony Parker 的点数据，返回 name 和 age 属性值。
nebula> LOOKUP ON player \
WHERE player.name == "Tony Parker" \
YIELD properties(vertex).name AS name, properties(vertex).age AS age;
Expand All @@ -96,6 +100,7 @@ nebula> LOOKUP ON player \
| "Tony Parker" | 36 |
+---------------+-----+

# 查询所有 age 大于 45 的点数据，并返回点数据的 ID。
nebula> LOOKUP ON player \
WHERE player.age > 45 \
YIELD id(vertex);
Expand All @@ -106,6 +111,7 @@ nebula> LOOKUP ON player \
| "player140" |
+-------------+

# 查询所有 name 以 B 开头，且 age 在 22 和 30 之间的点数据，并返回 name 和 age 属性值。
nebula> LOOKUP ON player \
WHERE player.name STARTS WITH "B" \
AND player.age IN [22,30] \
Expand All @@ -117,6 +123,7 @@ nebula> LOOKUP ON player \
| "Blake Griffin" | 30 |
+-------------------------+------------------------+

# 查询所有 name 等于 Kobe Bryant 的点数据，返回点的 ID 和 name 属性值，并以此为起始点进行遍历，返回遍历结果。
nebula> LOOKUP ON player \
WHERE player.name == "Kobe Bryant"\
YIELD id(vertex) AS VertexID, properties(vertex).name AS name |\
Expand All @@ -135,15 +142,18 @@ nebula> LOOKUP ON player \
返回 Edge type 为`follow`且`degree`为`90`的边。

```ngql
# 创建 Edge type 为 follow，属性 degree 的索引 index_follow。
nebula> CREATE EDGE INDEX IF NOT EXISTS index_follow ON follow(degree);

# 重建属性索引 index_follow，返回任务 id。
nebula> REBUILD EDGE INDEX index_follow;
+------------+
| New Job Id |
+------------+
| 62 |
+------------+

# 查询并返回所有 degree 等于 90 的边。
nebula> LOOKUP ON follow \
WHERE follow.degree == 90 YIELD edge AS e;
+----------------------------------------------------+
Expand All @@ -154,6 +164,7 @@ nebula> LOOKUP ON follow \
| [:follow "player118"->"player131" @0 {degree: 90}] |
...

# 查询所有 degree 等于 90 的边，并返回 degree 属性值。
nebula> LOOKUP ON follow \
WHERE follow.degree == 90 \
YIELD properties(edge).degree;
Expand All @@ -164,6 +175,7 @@ nebula> LOOKUP ON follow \
| 90 |
...

# 根据 degree 属性值升序排列，并返回前 10 条 degree 属性值。
nebula> LOOKUP ON follow \
YIELD properties(edge).degree as degree \
| ORDER BY $-.degree \
Expand All @@ -183,6 +195,7 @@ nebula> LOOKUP ON follow \
| 70 |
+--------+

# 查询所有 degree 等于 60 的边，返回边的目的点 ID 和边的 degree 属性值，并为此起始点进行遍历，返回遍历结果。
nebula> LOOKUP ON follow \
WHERE follow.degree == 60 \
YIELD dst(edge) AS DstVID, properties(edge).degree AS Degree |\
Expand All @@ -206,22 +219,25 @@ nebula> LOOKUP ON follow \
- 查找所有 Tag 为`player`的点 VID。

```ngql
# 创建名为 player 的 Tag。
nebula> CREATE TAG IF NOT EXISTS player(name string,age int);

# 创建 Tag 为 player 的索引 player_index。
nebula> CREATE TAG INDEX IF NOT EXISTS player_index on player();

# 重建索引 player_index，返回任务 id。
nebula> REBUILD TAG INDEX player_index;
+------------+
| New Job Id |
+------------+
| 66 |
+------------+

# 插入两个点数据。
nebula> INSERT VERTEX player(name,age) \
VALUES "player100":("Tim Duncan", 42), "player101":("Tony Parker", 36);

# 列出所有的 player。类似于 MATCH (n:player) RETURN id(n) /*, n */。

nebula> LOOKUP ON player YIELD id(vertex);
+-------------+
| id(VERTEX) |
Expand All @@ -245,22 +261,25 @@ nebula> LOOKUP ON follow \
- 查找 Edge type 为`follow`的所有边的信息。

```ngql
# 创建名为 follow 的 Edge type。
nebula> CREATE EDGE IF NOT EXISTS follow(degree int);

# 创建 Edge type 为 follow 的索引 follow_index。
nebula> CREATE EDGE INDEX IF NOT EXISTS follow_index on follow();

# 重建索引 follow_index。
nebula> REBUILD EDGE INDEX follow_index;
+------------+
| New Job Id |
+------------+
| 88 |
+------------+

# 插入边数据。
nebula> INSERT EDGE follow(degree) \
VALUES "player100"->"player101":(95);

# 列出所有的 follow 边。类似于 MATCH (s)-[e:follow]->(d) RETURN id(s), rank(e), id(d) /*, type(e) */。

nebula)> LOOKUP ON follow YIELD edge AS e;
+-----------------------------------------------------+
| e |
Expand All @@ -276,6 +295,7 @@ nebula> LOOKUP ON follow \
统计 Tag 为`player`的点和 Edge type 为`follow`的边。

```ngql
# 统计 Tag 为 player 的点总数。
nebula> LOOKUP ON player YIELD id(vertex)|\
YIELD COUNT(*) AS Player_Number;
+---------------+
Expand All @@ -284,6 +304,7 @@ nebula> LOOKUP ON player YIELD id(vertex)|\
| 51 |
+---------------+

# 统计 Edge type 为 follow 的边总数。
nebula> LOOKUP ON follow YIELD edge AS e| \
YIELD COUNT(*) AS Follow_Number;
+---------------+
Expand Down