keywords.md

title	summary	aliases
Keywords	Keywords and Reserved Words	/docs/dev/keywords-and-reserved-words/ /docs/dev/reference/sql/language-structure/keywords-and-reserved-words/ /tidb/dev/keywords-and-reserved-words/

Keywords

This article introduces the keywords in TiDB, the differences between reserved words and non-reserved words and summarizes all keywords for the query.

Keywords are words that have special meanings in SQL statements, such as SELECT, UPDATE, and DELETE. Some of them can be used as identifiers directly, which are called non-reserved keywords. Some of them require special treatment before being used as identifiers, which are called reserved keywords. However, there are special non-reserved keywords that might still require special treatment. It is recommended that you treat them as reserved keywords.

To use the reserved keywords as identifiers, you must enclose them in backticks `:

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)

The non-reserved keywords do not require backticks, such as BEGIN and END, which can be successfully used as identifiers in the following statement:

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

Query OK, 0 rows affected (0.09 sec)

In the special case, the reserved keywords do not need backticks if they are used with the . delimiter:

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

Query OK, 0 rows affected (0.08 sec)

Starting from v7.5.3 and v7.6.0, TiDB provides a full list of keywords in the INFORMATION_SCHEMA.KEYWORDS table.

Keyword list

The following list shows the keywords in TiDB. Reserved keywords are marked with (R). Reserved keywords for Window Functions are marked with (R-Window). Special non-reserved keywords that need to be escaped with backticks ` are marked with (S).

A

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

B

• 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

C

• 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
• CHECKSUM_CONCURRENCY
• 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
• COMPRESSION_LEVEL
• COMPRESSION_TYPE
• 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

D

• 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

E

• ELSE (R)
• ELSEIF (R)
• ENABLE
• ENABLED
• ENCLOSED (R)
• ENCRYPTION
• ENCRYPTION_KEYFILE
• ENCRYPTION_METHOD
• 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

F

• 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

G

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

H

• 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

I

• IDENTIFIED
• IF (R)
• IGNORE (R)
• IGNORE_STATS
• 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)

J

• JOB
• JOBS
• JOIN (R)
• JSON

K

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

L

• 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)
• LOAD_STATS
• LOCAL
• LOCALTIME (R)
• LOCALTIMESTAMP (R)
• LOCATION
• LOCK (R)
• LOCKED
• LOGS
• LONG (R)
• LONGBLOB (R)
• LONGTEXT (R)
• LOW_PRIORITY (R)

M

• 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

N

• 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

O

• 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)

P

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

Q

• QUARTER
• QUERIES
• QUERY
• QUICK

R

• RANGE (R)
• RANK (R-Window)
• RATE_LIMIT
• READ (R)
• REAL (R)
• REBUILD
• RECOMMEND
• 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

S

• 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
• 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

T

• TABLE (R)
• TABLES
• TABLESAMPLE (R)
• TABLESPACE
• TABLE_CHECKSUM
• 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

U

• 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)

V

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

W

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

X

• X509
• XOR (R)

Y

• YEAR
• YEAR_MONTH (R)

Z

• ZEROFILL (R)