注意事项
如果这几种标识符是下面的保留字作为数据库名、表名、列名、函数名、视图名等标识符的时候，需要加上默认的转义符：
标识符：` 反引号例如: hour -> `hour`create table `hour` (id string,`asc` int)hour、asc 为关键字，此时如果需要创建这样的列就必须带上反引号进行创建。
关键保留字
A
ALL
ALTER
AND
ANY
AS
AUTHORIZATION
B
BETWEEN
BOTH
BY
C
CALL
CASE
CAST
CHECK
CLUSTER
COLLATE
COLUMN
CONSTRAINT
CREATE
CROSS
CUBE
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURRENT_USER
CURSOR
D
DEALLOCATE
DEFAULT
DELETE
DESCRIBE
DISTINCT
DISTRIBUTE
DROP
E
ELSE
END
ESCAPE
EXCEPT
EXECUTE
EXISTS
EXPLAIN
EXTRACT
F
FETCH
FILTER
FOR
FOREIGN
FROM
FULL
FALSE
G
GRANT
GROUP
GROUPING
H
HAVING
I
IN
INNER
INSERT
INTERSECT
INTERVAL
INTO
IS
J
JOIN
L
LATERAL
LEADING
LEFT
LIKE
LIMIT
LOCALTIME
LOCALTIMESTAMP
M
MERGE
MINUS
N
NATURAL
NEW
NEXT
NORMALIZE
NOT
NULL
O
OFFSET
ON
ONLY
OR
ORDER
OUTER
OVER
OVERLAPS
P
PARTITION
PATTERN
PERCENTILE_CONT
PERCENTILE_DISC
PERMUTE
PREPARE
PRIMARY
R
RANGE
RECURSIVE
REFERENCES
RIGHT
ROLLUP
ROW
ROWS
S
SELECT
SEMI
SESSION_USER
SET
SOME
T
TABLE
THEN
TIME
TO
TRAILING
TRUE
U
UESCAPE
UNION
UNIQUE
UNKNOWN
UNNEST
UPDATE
USER
USING
V
VALUES
W
WHEN
WHERE
WINDOW
WITH
WITHIN
