关键字

本文介绍 TiDB 的关键字，对保留字和非保留字作出区分，并汇总所有的关键字以供查询使用。

关键字是 SQL 语句中具有特殊含义的单词，例如 SELECT，UPDATE，DELETE 等等。它们之中有的能够直接作为标识符，被称为非保留关键字（简称非保留字），但有需要经过特殊处理才能作为标识符的字，被称为保留关键字（简称保留字）。但是，也存在一些特殊的非保留关键字，有时候可能也需要进行特殊处理，推荐你将它们当作保留关键字处理。

对于保留字，必须使用反引号包裹，才能作为标识符被使用。例如：

CREATE TABLE select (a INT);

ERROR 1105 (HY000): line 0 column 19 near " (a INT)" (total length 27)

CREATE TABLE `select` (a INT);

Query OK, 0 rows affected (0.09 sec)

而非保留字则不需要反引号也能直接作为标识符。例如 BEGIN 和 END 是非保留字，以下语句能够正常执行：

CREATE TABLE `select` (BEGIN int, END int);

Query OK, 0 rows affected (0.09 sec)

有一种特殊情况，如果使用了限定符 .，那么也不需要用反引号：

CREATE TABLE test.select (BEGIN int, END int);

Query OK, 0 rows affected (0.08 sec)

TiDB 从 v7.6.0 开始提供 INFORMATION_SCHEMA.KEYWORDS 表，可以用于查询 TiDB 中所有的关键字。

关键字列表

下表列出了 TiDB 中所有的关键字。其中保留字用 (R) 来标识。窗口函数的保留字用 (R-Window) 来标识。需要用反引号 ` 包裹的特殊非保留字用 (S) 来标识。

ACCOUNT
ACTION
ADD (R)
ADMIN
ADVISE
AFTER
AGAINST
AGO
ALGORITHM
ALL (R)
ALTER (R)
ALWAYS
ANALYZE (R)
AND (R)
ANY
ARRAY (R)
AS (R)
ASC (R)
ASCII
ATTRIBUTE
ATTRIBUTES
AUTO_ID_CACHE
AUTO_INCREMENT
AUTO_RANDOM
AUTO_RANDOM_BASE
AVG
AVG_ROW_LENGTH

BACKEND
BACKUP
BACKUPS
BATCH
BDR
BEGIN
BERNOULLI
BETWEEN (R)
BIGINT (R)
BINARY (R)
BINDING
BINDINGS
BINDING_CACHE
BINLOG
BIT
BLOB (R)
BLOCK
BOOL
BOOLEAN
BOTH (R)
BTREE
BUCKETS
BUILTINS
BY (R)
BYTE

CACHE
CALIBRATE
CALL (R)
CANCEL
CAPTURE
CARDINALITY
CASCADE (R)
CASCADED
CASE (R)
CAUSAL
CHAIN
CHANGE (R)
CHAR (R)
CHARACTER (R)
CHARSET
CHECK (R)
CHECKPOINT
CHECKSUM
CIPHER
CLEANUP
CLIENT
CLIENT_ERRORS_SUMMARY
CLOSE
CLUSTER
CLUSTERED
CMSKETCH
COALESCE
COLLATE (R)
COLLATION
COLUMN (R)
COLUMN_FORMAT
COLUMN_STATS_USAGE
COLUMNS
COMMENT
COMMIT
COMMITTED
COMPACT
COMPRESSED
COMPRESSION
CONCURRENCY
CONFIG
CONNECTION
CONSISTENCY
CONSISTENT
CONSTRAINT (R)
CONTEXT
CONTINUE (R)
CONVERT (R)
CORRELATION
CPU
CREATE (R)
CROSS (R)
CSV_BACKSLASH_ESCAPE
CSV_DELIMITER
CSV_HEADER
CSV_NOT_NULL
CSV_NULL
CSV_SEPARATOR
CSV_TRIM_LAST_SEPARATORS
CUME_DIST (R-Window)
CURRENT
CURRENT_DATE (R)
CURRENT_ROLE (R)
CURRENT_TIME (R)
CURRENT_TIMESTAMP (R)
CURRENT_USER (R)
CURSOR (R)
CYCLE

DATA
DATABASE (R)
DATABASES (R)
DATE
DATETIME
DAY
DAY_HOUR (R)
DAY_MICROSECOND (R)
DAY_MINUTE (R)
DAY_SECOND (R)
DDL
DEALLOCATE
DECIMAL (R)
DECLARE
DEFAULT (R)
DEFINER
DELAY_KEY_WRITE
DELAYED (R)
DELETE (R)
DENSE_RANK (R-Window)
DEPENDENCY
DEPTH
DESC (R)
DESCRIBE (R)
DIGEST
DIRECTORY
DISABLE
DISABLED
DISCARD
DISK
DISTINCT (R)
DISTINCTROW (R)
DIV (R)
DO
DOUBLE (R)
DRAINER
DROP (R)
DRY
DUAL (R)
DUPLICATE
DYNAMIC

ELSE (R)
ELSEIF (R)
ENABLE
ENABLED
ENCLOSED (R)
ENCRYPTION
END
ENFORCED
ENGINE
ENGINES
ENUM
ERROR
ERRORS
ESCAPE
ESCAPED (R)
EVENT
EVENTS
EVOLVE
EXCEPT (R)
EXCHANGE
EXCLUSIVE
EXECUTE
EXISTS (R)
EXIT (R)
EXPANSION
EXPIRE
EXPLAIN (R)
EXTENDED

FAILED_LOGIN_ATTEMPTS
FALSE (R)
FAULTS
FETCH (R)
FIELDS
FILE
FIRST
FIRST_VALUE (R-Window)
FIXED
FLOAT (R)
FLOAT4 (R)
FLOAT8 (R)
FLUSH
FOLLOWING
FOR (R)
FORCE (R)
FOREIGN (R)
FORMAT
FOUND
FROM (R)
FULL
FULLTEXT (R)
FUNCTION

GENERAL
GENERATED (R)
GLOBAL
GRANT (R)
GRANTS
GROUP (R)
GROUPS (R-Window)

HANDLER
HASH
HAVING (R)
HELP
HIGH_PRIORITY (R)
HISTOGRAM
HISTOGRAMS_IN_FLIGHT
HISTORY
HOSTS
HOUR
HOUR_MICROSECOND (R)
HOUR_MINUTE (R)
HOUR_SECOND (R)
HYPO

IDENTIFIED
IF (R)
IGNORE (R)
ILIKE (R)
IMPORT
IMPORTS
IN (R)
INCREMENT
INCREMENTAL
INDEX (R)
INDEXES
INFILE (R)
INNER (R)
INOUT (R)
INSERT (R)
INSERT_METHOD
INSTANCE
INT (R)
INT1 (R)
INT2 (R)
INT3 (R)
INT4 (R)
INT8 (R)
INTEGER (R)
INTERSECT (R)
INTERVAL (R)
INTO (R)
INVISIBLE
INVOKER
IO
IPC
IS (R)
ISOLATION
ISSUER
ITERATE (R)

JOB
JOBS
JOIN (R)
JSON

KEY (R)
KEYS (R)
KEY_BLOCK_SIZE
KILL (R)

LABELS
LAG (R-Window)
LANGUAGE
LAST
LAST_BACKUP
LAST_VALUE (R-Window)
LASTVAL
LEAD (R-Window)
LEADING (R)
LEAVE (R)
LEFT (R)
LESS
LEVEL
LIKE (R)
LIMIT (R)
LINEAR (R)
LINES (R)
LIST
LOAD (R)
LOCAL
LOCALTIME (R)
LOCALTIMESTAMP (R)
LOCATION
LOCK (R)
LOCKED
LOGS
LONG (R)
LONGBLOB (R)
LONGTEXT (R)
LOW_PRIORITY (R)

MASTER
MATCH (R)
MAXVALUE (R)
MAX_CONNECTIONS_PER_HOUR
MAX_IDXNUM
MAX_MINUTES
MAX_QUERIES_PER_HOUR
MAX_ROWS
MAX_UPDATES_PER_HOUR
MAX_USER_CONNECTIONS
MB
MEDIUMBLOB (R)
MEDIUMINT (R)
MEDIUMTEXT (R)
MEMBER
MEMORY
MERGE
MICROSECOND
MIDDLEINT (R)
MINUTE
MINUTE_MICROSECOND (R)
MINUTE_SECOND (R)
MINVALUE
MIN_ROWS
MOD (R)
MODE
MODIFY
MONTH

NAMES
NATIONAL
NATURAL (R)
NCHAR
NEVER
NEXT
NEXTVAL
NO
NOCACHE
NOCYCLE
NODEGROUP
NODE_ID
NODE_STATE
NOMAXVALUE
NOMINVALUE
NONCLUSTERED
NONE
NOT (R)
NOWAIT
NO_WRITE_TO_BINLOG (R)
NTH_VALUE (R-Window)
NTILE (R-Window)
NULL (R)
NULLS
NUMERIC (R)
NVARCHAR

OF (R)
OFF
OFFSET
OLTP_READ_ONLY
OLTP_READ_WRITE
OLTP_WRITE_ONLY
ON (R)
ON_DUPLICATE
ONLINE
ONLY
OPEN
OPTIMISTIC
OPTIMIZE (R)
OPTION (R)
OPTIONAL
OPTIONALLY (R)
OR (R)
ORDER (R)
OUT (R)
OUTER (R)
OUTFILE (R)
OVER (R-Window)

PACK_KEYS
PAGE
PARSER
PARTIAL
PARTITION (R)
PARTITIONING
PARTITIONS
PASSWORD
PASSWORD_LOCK_TIME
PAUSE
PERCENT
PERCENT_RANK (R-Window)
PER_DB
PER_TABLE
PESSIMISTIC
PLACEMENT (S)
PLUGINS
POINT
POLICY
PRECEDING
PRECISION (R)
PREPARE
PRESERVE
PRE_SPLIT_REGIONS
PRIMARY (R)
PRIVILEGES
PROCEDURE (R)
PROCESS
PROCESSLIST
PROFILE
PROFILES
PROXY
PUMP
PURGE

QUARTER
QUERIES
QUERY
QUICK

RANGE (R)
RANK (R-Window)
RATE_LIMIT
READ (R)
REAL (R)
REBUILD
RECOVER
RECURSIVE (R)
REDUNDANT
REFERENCES (R)
REGEXP (R)
REGION
REGIONS
RELEASE (R)
RELOAD
REMOVE
RENAME (R)
REORGANIZE
REPAIR
REPEAT (R)
REPEATABLE
REPLACE (R)
REPLICA
REPLICAS
REPLICATION
REQUIRE (R)
REQUIRED
RESET
RESOURCE
RESPECT
RESTART
RESTORE
RESTORES
RESTRICT (R)
RESUME
REUSE
REVERSE
REVOKE (R)
RIGHT (R)
RLIKE (R)
ROLE
ROLLBACK
ROLLUP
ROUTINE
ROW (R)
ROW_COUNT
ROW_FORMAT
ROW_NUMBER (R-Window)
ROWS (R-Window)
RTREE
RUN

SAMPLERATE
SAMPLES
SAN
SAVEPOINT
SECOND
SECOND_MICROSECOND (R)
SECONDARY
SECONDARY_ENGINE
SECONDARY_LOAD
SECONDARY_UNLOAD
SECURITY
SELECT (R)
SEND_CREDENTIALS_TO_TIKV
SEPARATOR
SEQUENCE
SERIAL
SERIALIZABLE
SESSION
SESSION_STATES
SET (R)
SETVAL
SHARD_ROW_ID_BITS
SHARE
SHARED
SHOW (R)
SHUTDOWN
SIGNED
SIMPLE
SKIP
SKIP_SCHEMA_FILES
SLAVE
SLOW
SMALLINT (R)
SNAPSHOT
SOME
SOURCE
SPATIAL (R)
SPLIT
SQL (R)
SQL_BIG_RESULT (R)
SQL_BUFFER_RESULT
SQL_CACHE
SQL_CALC_FOUND_ROWS (R)
SQL_NO_CACHE
SQL_SMALL_RESULT (R)
SQL_TSI_DAY
SQL_TSI_HOUR
SQL_TSI_MINUTE
SQL_TSI_MONTH
SQL_TSI_QUARTER
SQL_TSI_SECOND
SQL_TSI_WEEK
SQL_TSI_YEAR
SQLEXCEPTION (R)
SQLSTATE (R)
SQLWARNING (R)
SSL (R)
START
STARTING (R)
STATISTICS
STATS
STATS_AUTO_RECALC
STATS_BUCKETS
STATS_COL_CHOICE
STATS_COL_LIST
STATS_EXTENDED (R)
STATS_HEALTHY
STATS_HISTOGRAMS
STATS_LOCKED
STATS_META
STATS_OPTIONS
STATS_PERSISTENT
STATS_SAMPLE_PAGES
STATS_SAMPLE_RATE
STATS_TOPN
STATUS
STORAGE
STORED (R)
STRAIGHT_JOIN (R)
STRICT_FORMAT
SUBJECT
SUBPARTITION
SUBPARTITIONS
SUPER
SWAPS
SWITCHES
SYSTEM
SYSTEM_TIME

TABLE (R)
TABLES
TABLESAMPLE (R)
TABLESPACE
TABLE_CHECKSUM
TELEMETRY
TELEMETRY_ID
TEMPORARY
TEMPTABLE
TERMINATED (R)
TEXT
THAN
THEN (R)
TIDB
TiDB_CURRENT_TSO (R)
TIFLASH
TIKV_IMPORTER
TIME
TIMESTAMP
TINYBLOB (R)
TINYINT (R)
TINYTEXT (R)
TO (R)
TOKEN_ISSUER
TOPN
TPCC
TPCH_10
TRACE
TRADITIONAL
TRAILING (R)
TRANSACTION
TRIGGER (R)
TRIGGERS
TRUE (R)
TRUNCATE
TSO
TTL
TTL_ENABLE
TTL_JOB_INTERVAL
TYPE

UNBOUNDED
UNCOMMITTED
UNDEFINED
UNICODE
UNION (R)
UNIQUE (R)
UNKNOWN
UNLOCK (R)
UNSET
UNSIGNED (R)
UNTIL (R)
UPDATE (R)
USAGE (R)
USE (R)
USER
USING (R)
UTC_DATE (R)
UTC_TIME (R)
UTC_TIMESTAMP (R)

VALIDATION
VALUE
VALUES (R)
VARBINARY (R)
VARCHAR (R)
VARCHARACTER (R)
VARIABLES
VARYING (R)
VIEW
VIRTUAL (R)
VISIBLE

WAIT
WARNINGS
WEEK
WEIGHT_STRING
WHEN (R)
WHERE (R)
WHILE (R)
WIDTH
WINDOW (R-Window)
WITH (R)
WITHOUT
WORKLOAD
WRITE (R)

X509
XOR (R)

YEAR
YEAR_MONTH (R)

ZEROFILL (R)