本节很重要，请大家收藏，避免在编写程序的时候踩坑。因为关键字是被 TDengine 系统使用的，如果你在 SQL 中使用了保留关键词，并且没有被反引号包括时，会报语法错误，当你不知道这个是保留关键词时，就会反复检测语法，最后发现语法也没问题，而是保留关键词的问题，了解了这章内容，你就不会再踩这些坑了。
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：
关键字 说明 ABORT ACCOUNT ACCOUNTS ADD AFTER AGGREGATE ALIAS ALIVE ALL ALTER ANALYZE 3.3.4.3+ AND ANODE 3.3.4.3+ ANODES 3.3.4.3+ ANOMALY_WINDOW 3.3.4.3+ ANTI APPS ARBGROUPS ARROW AS ASC ASOF ASYNC 3.3.6.0+ AT_ONCE ATTACH AUTO 3.3.5.0+ ASSIGN 3.3.6.0+
关键字 说明 BALANCE BEFORE BEGIN BETWEEN BIGINT BIN BINARY BITAND BITAND BITNOT BITOR BLOB BLOCKS BNODE BNODES BOOL BOTH BUFFER BUFSIZE BWLIMIT BY
关键字 说明 CACHE CACHEMODEL CACHESIZE CASE CAST CHANGE CHILD CLIENT_VERSION CLUSTER COLON COLS 3.3.6.0+ COLUMN COMMA COMMENT COMP COMPACT COMPACTS COMPACT_INTERVAL 3.3.5.0+ COMPACT_TIME_OFFSET 3.3.5.0+ COMPACT_TIME_RANGE 3.3.5.0+ CONCAT CONFLICT CONNECTION CONNECTIONS CONNS CONSUMER CONSUMERS CONTAINS CONTINUOUS_WINDOW_CLOSE 3.3.6.0+ COPY COUNT COUNT_WINDOW CREATE CREATEDB CURRENT_USER
关键字 说明 DATABASE DATABASES DBS DECIMAL 3.3.6.0+ DEFERRED DELETE DELETE_MARK DELIMITERS DESC DESCRIBE DETACH DISK_INFO 3.3.5.0+ DISTINCT DISTRIBUTED DIVIDE DNODE DNODES DOT DOUBLE DROP DURATION
关键字 说明 EACH ELSE ENABLE ENCRYPT_ALGORITHM ENCRYPT_KEY ENCRYPTIONS END EQ EVENT_WINDOW EVERY EXCEPT EXISTS EXPIRED EXPLAIN
关键字 说明 FAIL FHIGH 3.3.4.3+ FILE FILL FILL_HISTORY FIRST FLOAT FLOW 3.3.4.3+ FLUSH FOR FORCE FORCE_WINDOW_CLOSE 3.3.4.3+ FROM FROWTS 3.3.4.3+ FULL FUNCTION FUNCTIONS
关键字 说明 GE GEOMETRY GLOB GRANT GRANTS GROUP GT
关键字 说明 ID IF IGNORE ILLEGAL IMMEDIATE IMPORT IN INDEX INDEXES INITIALLY INNER INSERT INSTEAD INT INTEGER INTERSECT INTERVAL INTO IPTOKEN IROWTS IROWTS_ORIGIN 3.3.5.0+ IS IS_IMPORT ISFILLED ISNULL
关键字 说明 KEEP KEEP_TIME_OFFSET KEY KILL
关键字 说明 LANGUAGE LAST LAST_ROW LE LEADER LEADING LEFT LEVEL 3.3.0.0 - 3.3.2.11 LICENCES LIKE LIMIT LINEAR LOCAL LOGS LP LSHIFT LT
关键字 说明 MACHINES MATCH MAX_DELAY MAXROWS MEDIUMBLOB MERGE META META_ONLY 3.3.6.0+ MINROWS MINUS MNODE MNODES MODIFY MODULES
关键字 说明 NCHAR NE NEXT NMATCH NONE NORMAL NOT NOTIFY 3.3.6.0+ NOTIFY_HISTORY 3.3.6.0+ NOTNULL NOW NULL NULL_F NULLS
关键字 说明 OF OFFSET ON ONLY ON_FAILURE 3.3.6.0+ OR ORDER OUTER OUTPUTTYPE
关键字 说明 PAGES PAGESIZE PARTITION PASS PAUSE PI PLUS PORT POSITION PPS PRECISION PREV PRIMARY PRIVILEGE PRIVILEGES
关键字 说明 QDURATION QEND QNODE QNODES QSTART QTAGS QTIME QUERIES QUERY QUESTION
关键字 说明 RAISE RAND RANGE RATIO READ RECURSIVE REGEXP 3.3.6.0+ REDISTRIBUTE REM REPLACE REPLICA RESET RESTORE RESTRICT RESUME RETENTIONS REVOKE RIGHT ROLLUP ROW ROWTS RP RSHIFT
关键字 说明 S3_CHUNKPAGES S3_COMPACT S3_KEEPLOCAL SCHEMALESS SCORES SELECT SEMI SERVER_STATUS SERVER_VERSION SESSION SET SHOW SINGLE_STABLE SLASH SLIDING SLIMIT SMA SMALLINT SMIGRATE SNODE SNODES SOFFSET SPLIT STABLE STABLES STAR START STATE STATE_WINDOW STATEMENT STORAGE STREAM STREAMS STRICT STRING STT_TRIGGER SUBSCRIBE SUBSCRIPTIONS SUBSTR SUBSTRING SUBTABLE SYSINFO SYSTEM
关键字 说明 TABLE TABLE_PREFIX TABLE_SUFFIX TABLES TAG TAGS TBNAME THEN TIMES TIMESTAMP TIMEZONE TINYINT TO TODAY TOPIC TOPICS TRAILING TRANSACTION TRANSACTIONS TRIGGER TRIM TRUE_FOR 3.3.6.0+ TSDB_PAGESIZE TSERIES TSMA TSMAS TTL
关键字 说明 UNION UNSAFE UNSIGNED UNTREATED UPDATE USE USER USERS USING
关键字 说明 VALUE VALUE_F VALUES VARBINARY VARCHAR VARIABLE VARIABLES VERBOSE VGROUP VGROUPS VIEW VIEWS VNODE VNODES
关键字 说明 WAL WAL_FSYNC_PERIOD WAL_LEVEL WAL_RETENTION_PERIOD WAL_RETENTION_SIZE WAL_ROLL_PERIOD WAL_SEGMENT_SIZE WATERMARK WDURATION WEND WHEN WHERE WINDOW WINDOW_CLOSE WINDOW_OFFSET WITH WRITE WSTART
_C0 _IROWTS _QDURATION _QEND _QSTART _ROWTS _WDURATION _WEND _WSTART 更多内容欢迎访问 TDengine 官网
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