本節很重要，請大家收藏，避免在編寫程序的時候踩坑。因為關鍵字是被 TDengine 系統使用的，如果你在 SQL 中使用了保留關鍵詞，并且沒有被反引號包括時，會報語法錯誤，當你不知道這個是保留關鍵詞時，就會反復檢測語法，最后發現語法也沒問題，而是保留關鍵詞的問題，了解了這章內容，你就不會再踩這些坑了。
目前 TDengine 有 200 多個內部保留關鍵字，這些關鍵字如果需要用作庫名、表名、超級表名、子表名、數據列名及標簽列名等，無論大小寫，需要使用符號 ` 將關鍵字括起來使用，例如 `ADD`。
關鍵字列表如下：
關鍵字 說明 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+
關鍵字 說明 BALANCE BEFORE BEGIN BETWEEN BIGINT BIN BINARY BITAND BITAND BITNOT BITOR BLOB BLOCKS BNODE BNODES BOOL BOTH BUFFER BUFSIZE BWLIMIT BY
關鍵字 說明 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
關鍵字 說明 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
關鍵字 說明 EACH ELSE ENABLE ENCRYPT_ALGORITHM ENCRYPT_KEY ENCRYPTIONS END EQ EVENT_WINDOW EVERY EXCEPT EXISTS EXPIRED EXPLAIN
關鍵字 說明 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
關鍵字 說明 GE GEOMETRY GLOB GRANT GRANTS GROUP GT
關鍵字 說明 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
關鍵字 說明 KEEP KEEP_TIME_OFFSET KEY KILL
關鍵字 說明 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
關鍵字 說明 MACHINES MATCH MAX_DELAY MAXROWS MEDIUMBLOB MERGE META META_ONLY 3.3.6.0+ MINROWS MINUS MNODE MNODES MODIFY MODULES
關鍵字 說明 NCHAR NE NEXT NMATCH NONE NORMAL NOT NOTIFY 3.3.6.0+ NOTIFY_HISTORY 3.3.6.0+ NOTNULL NOW NULL NULL_F NULLS
關鍵字 說明 OF OFFSET ON ONLY ON_FAILURE 3.3.6.0+ OR ORDER OUTER OUTPUTTYPE
關鍵字 說明 PAGES PAGESIZE PARTITION PASS PAUSE PI PLUS PORT POSITION PPS PRECISION PREV PRIMARY PRIVILEGE PRIVILEGES
關鍵字 說明 QDURATION QEND QNODE QNODES QSTART QTAGS QTIME QUERIES QUERY QUESTION
關鍵字 說明 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
關鍵字 說明 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
關鍵字 說明 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
關鍵字 說明 UNION UNSAFE UNSIGNED UNTREATED UPDATE USE USER USERS USING
關鍵字 說明 VALUE VALUE_F VALUES VARBINARY VARCHAR VARIABLE VARIABLES VERBOSE VGROUP VGROUPS VIEW VIEWS VNODE VNODES
關鍵字 說明 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 更多內容歡迎訪問 TDengine 官網
、負載均衡)
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