从补丁 198 开始，Amazon Redshift 将不再支持创建新的 Python UDF。现有的 Python UDF 将继续正常运行至 2026 年 6 月 30 日。有关更多信息，请参阅[博客文章](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/)。

# 保留字
<a name="r_pg_keywords"></a>

下面是 Amazon Redshift 保留关键字的列表。您可以通过分隔标识符（双引号）使用保留关键字。

**注意**  
虽然 START 和 CONNECT 不是保留字，但如果您在查询中使用 START 和 CONNECT 作为表别名，请使用分隔标识符或 AS，以避免在运行时失败。

有关更多信息，请参阅 [名称和标识符](r_names.md)。

```
AES128
AES256
ALL
ALLOWOVERWRITE
ANALYSE
ANALYZE
AND
ANY
ARRAY
AS
ASC
AUTHORIZATION
AZ64
BACKUP
BETWEEN
BINARY
BLANKSASNULL
BOTH
BYTEDICT
BZIP2
CASE
CAST
CHECK
COLLATE
COLUMN
CONSTRAINT
CREATE
CREDENTIALS
CROSS
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURRENT_USER
CURRENT_USER_ID
DEFAULT
DEFERRABLE
DEFLATE
DEFRAG
DELTA
DELTA32K
DESC
DISABLE
DISTINCT
DO
ELSE
EMPTYASNULL
ENABLE
ENCODE
ENCRYPT     
ENCRYPTION
END
EXCEPT
EXPLICIT
FALSE
FOR
FOREIGN
FREEZE
FROM
FULL
GLOBALDICT256
GLOBALDICT64K
GRANT
GROUP
GZIP
HAVING
IDENTITY
IGNORE
ILIKE
IN
INITIALLY
INNER
INTERSECT
INTERVAL
INTO
IS
ISNULL
JOIN
LEADING
LEFT
LIKE
LIMIT
LOCALTIME
LOCALTIMESTAMP
LUN
LUNS
LZO
LZOP
MINUS
MOSTLY16
MOSTLY32
MOSTLY8
NATURAL
NEW
NOT
NOTNULL
NULL
NULLS
OFF
OFFLINE
OFFSET
OID
OLD
ON
ONLY
OPEN
OR
ORDER
OUTER
OVERLAPS
PARALLEL
PARTITION
PERCENT
PERMISSIONS
PIVOT
PLACING
PRIMARY
RAW
READRATIO
RECOVER
REFERENCES
REJECTLOG
RESORT
RESPECT
RESTORE
RIGHT
SELECT
SESSION_USER
SIMILAR
SNAPSHOT 
SOME
SYSDATE
SYSTEM
TABLE
TAG
TDES
TEXT255
TEXT32K
THEN
TIMESTAMP
TO
TOP
TRAILING
TRUE
TRUNCATECOLUMNS
UNION
UNIQUE
UNNEST
UNPIVOT
USER
USING
VERBOSE
WALLET
WHEN
WHERE
WITH
WITHOUT
```