EXTRACT(fieldFROMsource)extract函数从日期或时间的数值里抽取子域,比如年、小时等。source必须是一个timestamp、time或interval类型的值表达式(类型为date的表达式转换为timestamp,因此也可以用)。field是一个标识符或者字符串,它指定从源数据中抽取的域。extract函
date_time_expression：要从中提取日期\/时间部分的日期\/时间值，可以是以下形式之一：字符串日期\/时间值，例如 '2023-03-08 12:34:56' 日期\/时间类型的值，例如 DATE '2023-03-08' 或 TIMESTAMP '2023-03-08 12:34:56'用法示例 提取日期中的年：```sql SELECT EXTRACT(YEAR FROM '2023-03-08')...
test=# select extract (millennium from timestamp '2017-07-31 22:18:00'); date_part 3 (1 row) 5. quarter (季度) test=# select extract (quarter from timestamp '2017-07-31 22:18:00'); date_part 3 (1 row) 6. month (月份) test=# select extract (month from timestamp '2017-07...
实例SQL select extract(MICROSECOND from timestamp '2021-08-25 08:54:09.549'), extract(SECOND from timestamp '2021-08-25 08:54:09.549'), extract(MINUTE from timestamp '2021-08-25 08:54:09.549'), extract(hour from timestamp '2021-08-25 08:54:09.549'), extract(DAY from timestamp '...
createtabletestaasselectextract(yearfromsystimestamp)as"year",extract(monthfromsystimestamp)as"month",extract(dayfromsystimestamp)as"day",extract(hourfromsystimestamp)as"hour",extract(minutefromsystimestamp)as"minute",extract(secondfromsystimestamp)as"second"fromdual;SQL>desctesta; ...
在SQL中，存储日期或时间戳的常见数据类型包括DATE（日期），TIME（时间），DATETIME（日期时间）和TIMESTAMP（时间戳）。使用Extract函数，可以从这些数据类型中提取年、月、日、小时、分钟、秒等部分，并进行进一步的操作。下面是Extract函数的语法：```EXTRACT(part FROM source)```其中，part是要提取的部分，可以...
The best idea to get DATE and TIME from Timestamp. This is one of the better way to use DATE function in SQL query. It is also a best DATE example.
SQL> 若要取一个月的数据,应该用下面的方式。with t as (select to_date('1980-12-31 15:20:30','yyyy-mm-dd hh24:mi:ss') as d1,to_date('1980-12-31 05:20:30','yyyy-mm-dd hh24:mi:ss') as d2from dual)select d1,d2 from t where d1>=trunc(d2,'mm') and d1 D1 D2...
要使用EXTRACT函数获取时间戳信息,您需要将时间戳作为参数传递给EXTRACT函数,并指定要提取的时间戳信息类型。以下是一个示例: SELECT EXTRACT(YEAR FROM TIMESTAMP '2022-01-15 09:30:00') AS year, EXTRACT(MONTH FROM TIMESTAMP '2022-01-15 09:30:00') AS month, EXTRACT(DAY FROM TIMESTAMP '2022-01-...
Epoch datepart is not supported by Databricks. This PR fixes this by changing it to unix_timestamp(). Check List Tests have been run in packages where changes made if available Linter has been r...