20-keywords.md

---
sidebar_label: 保留关键字
title: 保留关键字
description: TDengine 保留关键字的详细列表
---

## 保留关键字

目前 TDengine 有 200 多个内部保留关键字，这些关键字如果需要用作库名、表名、超级表名、子表名、数据列名及标签列名等，无论大小写，需要使用符号 `` ` `` 将关键字括起来使用，例如 \`ADD\`。

关键字列表如下：

### A

- ABORT
- ACCOUNT
- ACCOUNTS
- ADD
- AFTER
- AGGREGATE
- ALL
- ALTER
- ANALYZE
- AND
- APPS
- AS
- ASC
- AT_ONCE
- ATTACH

### B

- BALANCE
- BEFORE
- BEGIN
- BETWEEN
- BIGINT
- BINARY
- BITAND
- BITNOT
- BITOR
- BLOCKS
- BNODE
- BNODES
- BOOL
- BUFFER
- BUFSIZE
- BY

### C

- CACHE
- CACHEMODEL
- CACHESIZE
- CASCADE
- CAST
- CHANGE
- CLIENT_VERSION
- CLUSTER
- COLON
- COLUMN
- COMMA
- COMMENT
- COMP
- COMPACT
- CONCAT
- CONFLICT
- CONNECTION
- CONNECTIONS
- CONNS
- CONSUMER
- CONSUMERS
- CONTAINS
- COPY
- COUNT
- CREATE
- CURRENT_USER

### D

- DATABASE
- DATABASES
- DBS
- DEFERRED
- DELETE
- DELIMITERS
- DESC
- DESCRIBE
- DETACH
- DISTINCT
- DISTRIBUTED
- DIVIDE
- DNODE
- DNODES
- DOT
- DOUBLE
- DROP
- DURATION

### E

- EACH
- ENABLE
- END
- EVERY
- EXISTS
- EXPIRED
- EXPLAIN

### F

- FAIL
- FILE
- FILL
- FIRST
- FLOAT
- FLUSH
- FOR
- FROM
- FUNCTION
- FUNCTIONS

### G

- GLOB
- GRANT
- GRANTS
- GROUP

### H

- HAVING

### I

- ID
- IF
- IGNORE
- IMMEDIATE
- IMPORT
- IN
- INDEX
- INDEXES
- INITIALLY
- INNER
- INSERT
- INSTEAD
- INT
- INTEGER
- INTERVAL
- INTO
- IS
- ISNULL

### J

- JOIN
- JSON

### K

- KEEP
- KEY
- KILL

### L

- LAST
- LAST_ROW
- LICENCES
- LIKE
- LIMIT
- LINEAR
- LOCAL

### M

- MATCH
- MAX_DELAY
- MAXROWS
- MERGE
- META
- MINROWS
- MINUS
- MNODE
- MNODES
- MODIFY
- MODULES

### N

- NCHAR
- NEXT
- NMATCH
- NONE
- NOT
- NOTNULL
- NOW
- NULL
- NULLS

### O

- OF
- OFFSET
- ON
- OR
- ORDER
- OUTPUTTYPE

### P

- PAGES
- PAGESIZE
- PARTITIONS
- PASS
- PLUS
- PORT
- PPS
- PRECISION
- PREV
- PRIVILEGE

### Q

- QNODE
- QNODES
- QTIME
- QUERIES
- QUERY

### R

- RAISE
- RANGE
- RATIO
- READ
- REDISTRIBUTE
- RENAME
- REPLACE
- REPLICA
- RESET
- RESTRICT
- RETENTIONS
- REVOKE
- ROLLUP
- ROW

### S

- SCHEMALESS
- SCORES
- SELECT
- SEMI
- SERVER_STATUS
- SERVER_VERSION
- SESSION
- SET
- SHOW
- SINGLE_STABLE
- SLIDING
- SLIMIT
- SMA
- SMALLINT
- SNODE
- SNODES
- SOFFSET
- SPLIT
- STABLE
- STABLES
- STAR
- STATE
- STATE_WINDOW
- STATEMENT
- STORAGE
- STREAM
- STREAMS
- STRICT
- STRING
- SUBSCRIPTIONS
- SYNCDB
- SYSINFO

### T

- TABLE
- TABLES
- TAG
- TAGS
- TBNAME
- TIMES
- TIMESTAMP
- TIMEZONE
- TINYINT
- TO
- TODAY
- TOPIC
- TOPICS
- TRANSACTION
- TRANSACTIONS
- TRIGGER
- TRIM
- TSERIES
- TTL

### U

- UNION
- UNSIGNED
- UPDATE
- USE
- USER
- USERS
- USING

### V

- VALUE
- VALUES
- VARCHAR
- VARIABLE
- VARIABLES
- VERBOSE
- VGROUP
- VGROUPS
- VIEW
- VNODES

### W

- WAL
- WAL_FSYNC_PERIOD
- WAL_LEVEL
- WAL_RETENTION_PERIOD
- WAL_RETENTION_SIZE
- WAL_ROLL_PERIOD
- WAL_SEGMENT_SIZE
- WATERMARK
- WHERE
- WINDOW_CLOSE
- WITH
- WRITE

### \_

- \_C0
- \_IROWTS
- \_QDURATION
- \_QEND
- \_QSTART
- \_ROWTS
- \_WDURATION
- \_WEND
- \_WSTART