SQL Server 保留关键字
Microsoft® SQL Server™ 2000 使用保留关键字定义、操作和访问数据库。 保留关键字是 SQL Server 使用的 Transact-SQL 语言语法的一部分，用于分析和理解 Transact-SQL 语句和批处理。尽管在 Transact-SQL 脚本中，使用 SQL Server 保留关键字作为标识符和对象名在语法上是可行的，但规定只能使用分隔标识符。
下表列出了 SQL Server 的保留关键字。
| ADD | EXCEPT | PERCENT |
| ALL | EXEC | PLAN |
| ALTER | EXECUTE | PRECISION |
| AND | EXISTS | PRIMARY |
| ANY | EXIT | |
| AS | FETCH | PROC |
| ASC | FILE | PROCEDURE |
| AUTHORIZATION | FILLFACTOR | PUBLIC |
| BACKUP | FOR | RAISERROR |
| BEGIN | FOREIGN | READ |
| BETWEEN | FREETEXT | READTEXT |
| BREAK | FREETEXTTABLE | RECONFIGURE |
| BROWSE | FROM | REFERENCES |
| BULK | FULL | REPLICATION |
| BY | FUNCTION | RESTORE |
| CASCADE | GOTO | RESTRICT |
| CASE | GRANT | RETURN |
| CHECK | GROUP | REVOKE |
| CHECKPOINT | HAVING | RIGHT |
| CLOSE | HOLDLOCK | ROLLBACK |
| CLUSTERED | IDENTITY | ROWCOUNT |
| COALESCE | IDENTITY_INSERT | ROWGUIDCOL |
| COLLATE | IDENTITYCOL | RULE |
| COLUMN | IF | SAVE |
| COMMIT | IN | SCHEMA |
| COMPUTE | INDEX | SELECT |
| CONSTRAINT | INNER | SESSION_USER |
| CONTAINS | INSERT | SET |
| CONTAINSTABLE | INTERSECT | SETUSER |
| CONTINUE | INTO | SHUTDOWN |
| CONVERT | IS | SOME |
| CREATE | JOIN | STATISTICS |
| CROSS | KEY | SYSTEM_USER |
| CURRENT | KILL | TABLE |
| CURRENT_DATE | LEFT | TEXTSIZE |
| CURRENT_TIME | LIKE | THEN |
| CURRENT_TIMESTAMP | LINENO | TO |
| CURRENT_USER | LOAD | TOP |
| CURSOR | NATIONAL | TRAN |
| DATABASE | NOCHECK | TRANSACTION |
| DBCC | NONCLUSTERED | TRIGGER |
| DEALLOCATE | NOT | TRUNCATE |
| DECLARE | NULL | TSEQUAL |
| DEFAULT | NULLIF | UNION |
| DELETE | OF | UNIQUE |
| DENY | OFF | UPDATE |
| DESC | OFFSETS | UPDATETEXT |
| DISK | ON | USE |
| DISTINCT | OPEN | USER |
| DISTRIBUTED | OPENDATASOURCE | VALUES |
| DOUBLE | OPENQUERY | VARYING |
| DROP | OPENROWSET | VIEW |
| DUMMY | OPENXML | WAITFOR |
| DUMP | OPTION | WHEN |
| ELSE | OR | WHERE |
| END | ORDER | WHILE |
| ERRLVL | OUTER | WITH |
| ESCAPE | OVER | WRITETEXT |
另外，SQL-92 标准还定义了保留关键字列表。不要使用 SQL-92 保留关键字作为对象名和标识符。ODBC 保留关键字列表（如下所示）与 SQL-92 保留关键字列表相同。
说明 SQL-92 保留关键字列表有时可能比 SQL Server 限制更多，有时则限制更少。例如，SQL-92 保留关键字列表包含 INT，而 SQL Server 不需要将其区分为保留关键字。
Transact-SQL 保留关键字可用作数据库或数据库对象（如表、列、视图等）的标识符或名称。使用被引用的标识符或分隔标识符。对将保留关键字用作变量和存储过程参数的名称没有限制。
ODBC 保留关键字
保留了下列关键字用于 ODBC 函数调用。这些关键字根本不约束 SQL 语法；然而，为确保与支持核心 SQL 语法的驱动程序兼容，应用程序应避免使用这些关键字。
下面是当前的 ODBC 保留关键字列表。有关更多信息，请参见《MicrosoftODBC 3.0 程序员参考》，第 2 卷，附录 C。
| ABSOLUTE | EXEC | OVERLAPS |
| ACTION | EXECUTE | PAD |
| ADA | EXISTS | PARTIAL |
| ADD | EXTERNAL | PASCAL |
| ALL | EXTRACT | POSITION |
| ALLOCATE | FALSE | PRECISION |
| ALTER | FETCH | PREPARE |
| AND | FIRST | PRESERVE |
| ANY | FLOAT | PRIMARY |
| ARE | FOR | PRIOR |
| AS | FOREIGN | PRIVILEGES |
| ASC | FORTRAN | PROCEDURE |
| ASSERTION | FOUND | PUBLIC |
| AT | FROM | READ |
| AUTHORIZATION | FULL | REAL |
| AVG | GET | REFERENCES |
| BEGIN | GLOBAL | RELATIVE |
| BETWEEN | GO | RESTRICT |
| BIT | GOTO | REVOKE |
| BIT_LENGTH | GRANT | RIGHT |
| BOTH | GROUP | ROLLBACK |
| BY | HAVING | ROWS |
| CASCADE | HOUR | SCHEMA |
| CASCADED | IDENTITY | SCROLL |
| CASE | IMMEDIATE | SECOND |
| CAST | IN | SECTION |
| CATALOG | INCLUDE | SELECT |
| CHAR | INDEX | SESSION |
| CHAR_LENGTH | INDICATOR | SESSION_USER |
| CHARACTER | INITIALLY | SET |
| CHARACTER_LENGTH | INNER | SIZE |
| CHECK | INPUT | SMALLINT |
| CLOSE | INSENSITIVE | SOME |
| COALESCE | INSERT | SPACE |
| COLLATE | INT | SQL |
| COLLATION | INTEGER | SQLCA |
| COLUMN | INTERSECT | SQLCODE |
| COMMIT | INTERVAL | SQLERROR |
| CONNECT | INTO | SQLSTATE |
| CONNECTION | IS | SQLWARNING |
| CONSTRAINT | ISOLATION | SUBSTRING |
| CONSTRAINTS | JOIN | SUM |
| CONTINUE | KEY | SYSTEM_USER |
| CONVERT | LANGUAGE | TABLE |
| CORRESPONDING | LAST | TEMPORARY |
| COUNT | LEADING | THEN |
| CREATE | LEFT | TIME |
| CROSS | LEVEL | TIMESTAMP |
| CURRENT | LIKE | TIMEZONE_HOUR |
| CURRENT_DATE | LOCAL | TIMEZONE_MINUTE |
| CURRENT_TIME | LOWER | TO |
| CURRENT_TIMESTAMP | MATCH | TRAILING |
| CURRENT_USER | MAX | TRANSACTION |
| CURSOR | MIN | TRANSLATE |
| DATE | MINUTE | TRANSLATION |
| DAY | MODULE | TRIM |
| DEALLOCATE | MONTH | TRUE |
| DEC | NAMES | UNION |
| DECIMAL | NATIONAL | UNIQUE |
| DECLARE | NATURAL | UNKNOWN |
| DEFAULT | NCHAR | UPDATE |
| DEFERRABLE | NEXT | UPPER |
| DEFERRED | NO | USAGE |
| DELETE | NONE | USER |
| DESC | NOT | USING |
| DESCRIBE | NULL | VALUE |
| DESCRIPTOR | NULLIF | VALUES |
| DIAGNOSTICS | NUMERIC | VARCHAR |
| DISCONNECT | OCTET_LENGTH | VARYING |
| DISTINCT | OF | VIEW |
| DOMAIN | ON | WHEN |
| DOUBLE | ONLY | WHENEVER |
| DROP | OPEN | WHERE |
| ELSE | OPTION | WITH |
| END | OR | WORK |
| END-EXEC | ORDER | WRITE |
| ESCAPE | OUTER | YEAR |
| EXCEPT | OUTPUT | ZONE |
| EXCEPTION |
将来的关键字
以下关键字可能会保留在将来的 SQL Server 版本中，作为将来要实现的新特性。注意，不要使用这些关键字作为标识符。
| ABSOLUTE | FOUND | PRESERVE |
| ACTION | FREE | PRIOR |
| ADMIN | GENERAL | PRIVILEGES |
| AFTER | GET | READS |
| AGGREGATE | GLOBAL | REAL |
| ALIAS | GO | RECURSIVE |
| ALLOCATE | GROUPING | REF |
| ARE | HOST | REFERENCING |
| ARRAY | HOUR | RELATIVE |
| ASSERTION | IGNORE | RESULT |
| AT | IMMEDIATE | RETURNS |
| BEFORE | INDICATOR | ROLE |
| BINARY | INITIALIZE | ROLLUP |
| BIT | INITIALLY | ROUTINE |
| BLOB | INOUT | ROW |
| BOOLEAN | INPUT | ROWS |
| BOTH | INT | SAVEPOINT |
| BREADTH | INTEGER | SCROLL |
| CALL | INTERVAL | SCOPE |
| CASCADED | ISOLATION | SEARCH |
| CAST | ITERATE | SECOND |
| CATALOG | LANGUAGE | SECTION |
| CHAR | LARGE | SEQUENCE |
| CHARACTER | LAST | SESSION |
| CLASS | LATERAL | SETS |
| CLOB | LEADING | SIZE |
| COLLATION | LESS | SMALLINT |
| COMPLETION | LEVEL | SPACE |
| CONNECT | LIMIT | SPECIFIC |
| CONNECTION | LOCAL | SPECIFICTYPE |
| CONSTRAINTS | LOCALTIME | SQL |
| CONSTRUCTOR | LOCALTIMESTAMP | SQLEXCEPTION |
| CORRESPONDING | LOCATOR | SQLSTATE |
| CUBE | MAP | SQLWARNING |
| CURRENT_PATH | MATCH | START |
| CURRENT_ROLE | MINUTE | STATE |
| CYCLE | MODIFIES | STATEMENT |
| DATA | MODIFY | STATIC |
| DATE | MODULE | STRUCTURE |
| DAY | MONTH | TEMPORARY |
| DEC | NAMES | TERMINATE |
| DECIMAL | NATURAL | THAN |
| DEFERRABLE | NCHAR | TIME |
| DEFERRED | NCLOB | TIMESTAMP |
| DEPTH | NEW | TIMEZONE_HOUR |
| DEREF | NEXT | TIMEZONE_MINUTE |
| DESCRIBE | NO | TRAILING |
| DESCRIPTOR | NONE | TRANSLATION |
| DESTROY | NUMERIC | TREAT |
| DESTRUCTOR | OBJECT | TRUE |
| DETERMINISTIC | OLD | UNDER |
| DICTIONARY | ONLY | UNKNOWN |
| DIAGNOSTICS | OPERATION | UNNEST |
| DISCONNECT | ORDINALITY | USAGE |
| DOMAIN | OUT | USING |
| DYNAMIC | OUTPUT | VALUE |
| EACH | PAD | VARCHAR |
| END-EXEC | PARAMETER | VARIABLE |
| EQUALS | PARAMETERS | WHENEVER |
| EVERY | PARTIAL | WITHOUT |
| EXCEPTION | PATH | WORK |
| EXTERNAL | POSTFIX | WRITE |
| FLASE | PREFIX | YEAR |
| FIRST | PREORDER | ZONE |
| FLOAT | PREPARE |