本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。 # Amazon QLDB 中的預留關鍵字 **重要** 支援終止通知：現有客戶將可以使用 Amazon QLDB，直到 07/31/2025 的支援結束為止。如需詳細資訊，請參閱[將 Amazon QLDB Ledger 遷移至 Amazon Aurora PostgreSQL](https://aws.amazon.com/blogs/database/migrate-an-amazon-qldb-ledger-to-amazon-aurora-postgresql/)。 以下是 Amazon QLDB 中的 PartiQL 預留關鍵字清單。您可以使用預留關鍵字做為具有雙引號的引號識別符 （例如 `"user"`)。如需 QLDB 中 PartiQL 引號慣例的相關資訊，請參閱 [使用 PartiQL 查詢 Ion](ql-reference.query.md)。 **重要** 此清單中的關鍵字都視為預留，因為 PartiQL 與 [SQL-92](http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt) 向下相容。不過，QLDB 僅支援這些預留單字的子集。如需 QLDB 目前支援的 SQL 關鍵字清單，請參閱下列主題： [PartiQL 函數](ql-functions.md) [PartiQL 運算子](ql-operators.md) [PartiQL 命令](ql-reference.statements.md) ``` ABSOLUTE ACTION ADD ALL ALLOCATE ALTER AND ANY ARE AS ASC ASSERTION AT AUTHORIZATION AVG BAG BEGIN BETWEEN BIT BIT_LENGTH BLOB BOOL BOOLEAN BOTH BY CASCADE CASCADED CASE CAST CATALOG CHAR CHARACTER CHARACTER_LENGTH CHAR_LENGTH CHECK CLOB CLOSE COALESCE COLLATE COLLATION COLUMN COMMIT CONNECT CONNECTION CONSTRAINT CONSTRAINTS CONTINUE CONVERT CORRESPONDING COUNT CREATE CROSS CURRENT CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP CURRENT_USER CURSOR DATE DATE_ADD DATE_DIFF DAY DEALLOCATE DEC DECIMAL DECLARE DEFAULT DEFERRABLE DEFERRED DELETE DESC DESCRIBE DESCRIPTOR DIAGNOSTICS DISCONNECT DISTINCT DOMAIN DOUBLE DROP ELSE END END-EXEC ESCAPE EXCEPT EXCEPTION EXEC EXECUTE EXISTS EXTERNAL EXTRACT FALSE FETCH FIRST FLOAT FOR FOREIGN FOUND FROM FULL GET GLOBAL GO GOTO GRANT GROUP HAVING HOUR IDENTITY IMMEDIATE IN INDEX INDICATOR INITIALLY INNER INPUT INSENSITIVE INSERT INT INTEGER INTERSECT INTERVAL INTO IS ISOLATION JOIN KEY LANGUAGE LAST LEADING LEFT LEVEL LIKE LIMIT LIST LOCAL LOWER MATCH MAX MIN MINUTE MISSING MODULE MONTH NAMES NATIONAL NATURAL NCHAR NEXT NO NOT NULL NULLIF NUMERIC OCTET_LENGTH OF ON ONLY OPEN OPTION OR ORDER OUTER OUTPUT OVERLAPS PAD PARTIAL PIVOT POSITION PRECISION PREPARE PRESERVE PRIMARY PRIOR PRIVILEGES PROCEDURE PUBLIC READ REAL REFERENCES RELATIVE REMOVE RESTRICT REVOKE RIGHT ROLLBACK ROWS SCHEMA SCROLL SECOND SECTION SELECT SESSION SESSION_USER SET SEXP SIZE SMALLINT SOME SPACE SQL SQLCODE SQLERROR SQLSTATE STRING STRUCT SUBSTRING SUM SYMBOL SYSTEM_USER TABLE TEMPORARY THEN TIME TIMESTAMP TIMEZONE_HOUR TIMEZONE_MINUTE TO TO_STRING TO_TIMESTAMP TRAILING TRANSACTION TRANSLATE TRANSLATION TRIM TRUE TUPLE TXID UNDROP UNION UNIQUE UNKNOWN UNPIVOT UPDATE UPPER USAGE USER USING UTCNOW VALUE VALUES VARCHAR VARYING VIEW WHEN WHENEVER WHERE WITH WORK WRITE YEAR ZONE ```