关键字¶

关键字是 nGQL 中具有特殊含义的词，例如CREATE TAG语句中的CREATE和TAG。需要经过特殊处理才能作为标识符使用的关键字被称为保留关键字，而能够直接作为标识符使用的这部分关键字被称为非保留关键字。

不建议在创建 Schema 时使用关键字。如果必须使用关键字，请注意一下规则：

使用保留关键字或特殊字符作为标识符时，必须用反引号（`）包围，例如 `AND`。否则，会返回语义错误，创建失败。

使用非保留关键字作为标识符时：
- 若其包含大写字母，必须用反引号（`）包围，例如 `Comment`。否则，虽然能创建成功，系统会自动将标识符转化为全小写字母，也即 `comment`。
- 若其为全小写字母，可以不使用反引号（`）包围。

nebula> CREATE TAG TAG(name string);
[ERROR (-1004)]: SyntaxError: syntax error near `TAG'

nebula> CREATE TAG `TAG` (name string);
Execution succeeded

nebula> CREATE TAG SPACE(name string);
Execution succeeded

nebula> CREATE TAG 中文(简体 string);
Execution succeeded

nebula> CREATE TAG `￥%特殊 字符&*+-*/` (`q~！（）=  wer` string);
Execution succeeded

保留关键字¶

ACROSS
ADD
ALTER
AND
AS
ASC
ASCENDING
BALANCE
BOOL
BY
CASE
CHANGE
COMPACT
CREATE
DATE
DATETIME
DELETE
DESC
DESCENDING
DESCRIBE
DISTINCT
DOUBLE
DOWNLOAD
DROP
DURATION
EDGE
EDGES
EXISTS
EXPLAIN
FALSE
FETCH
FIND
FIXED_STRING
FLOAT
FLUSH
FROM
GEOGRAPHY
GET
GO
GRANT
IF
IGNORE_EXISTED_INDEX
IN
INDEX
INDEXES
INGEST
INSERT
INT
INT16
INT32
INT64
INT8
INTERSECT
IS
JOIN
LEFT
LIST
LOOKUP
MAP
MATCH
MINUS
NO
NOT
NULL
OF
ON
OR
ORDER
OVER
OVERWRITE
PATH
PROP
REBUILD
RECOVER
REMOVE
RESTART
RETURN
REVERSELY
REVOKE
SET
SHOW
STEP
STEPS
STOP
STRING
SUBMIT
TAG
TAGS
TIME
TIMESTAMP
TO
TRUE
UNION
UNWIND
UPDATE
UPSERT
UPTO
USE
VERTEX
VERTICES
WHEN
WHERE
WITH
XOR
YIELD

非保留关键字¶

ACCOUNT
ADMIN
AGENT
ALL
ALLSHORTESTPATHS
ANALYZER
ANY
ATOMIC_EDGE
AUTO
BASIC
BIDIRECT
BOTH
CHARSET
CLEAR
CLIENTS
COLLATE
COLLATION
COMMENT
CONFIGS
CONTAINS
DATA
DBA
DEFAULT
DIVIDE
DRAINER
DRAINERS
ELASTICSEARCH
ELSE
END
ENDS
ES_QUERY
FORCE
FORMAT
FULLTEXT
GOD
GRANTS
GRAPH
GROUP
GROUPS
GUEST
HDFS
HOST
HOSTS
HTTP
HTTPS
INTO
IP
JOB
JOBS
KILL
LEADER
LIMIT
LINESTRING
LISTENER
LOCAL
MERGE
META
NEW
NOLOOP
NONE
OFFSET
OPTIONAL
OUT
PART
PARTITION_NUM
PARTS
PASSWORD
PLAN
POINT
POLYGON
PROFILE
QUERIES
QUERY
READ
REDUCE
RENAME
REPLICA_FACTOR
RESET
ROLE
ROLES
S2_MAX_CELLS
S2_MAX_LEVEL
SAMPLE
SEARCH
SERVICE
SESSION
SESSIONS
SHORTEST
SHORTESTPATH
SIGN
SINGLE
SKIP
SNAPSHOT
SNAPSHOTS
SPACE
SPACES
STARTS
STATS
STATUS
STORAGE
SUBGRAPH
SYNC
TEXT
TEXT_SEARCH
THEN
TOP
TTL_COL
TTL_DURATION
USER
USERS
UUID
VALUE
VALUES
VARIABLES
VID_TYPE
WHITELIST
WRITE
ZONE
ZONES

最后更新: September 6, 2024