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时间#xff0c;是数据库中一个充满魔法的复杂表现形式。在这篇博客中#xff0c;我们将探讨在数据库中时间戳#xff08;timestamp#xff09;、日期#xff08;date#xff09;、日期时间#xff08;datetime#xff09;和字符串之间的转换技巧是数据库中一个充满魔法的复杂表现形式。在这篇博客中我们将探讨在数据库中时间戳timestamp、日期date、日期时间datetime和字符串之间的转换技巧覆盖主流数据库如MySQL、Oracle、SQL Server、PostgreSQL以及Spark SQL。
1. 时间戳Timestamp与日期Date之间的转换
1.1 MySQL
时间戳转为日期
SELECT FROM_UNIXTIME(timestamp_column) AS converted_date FROM your_table;日期转为时间戳
SELECT UNIX_TIMESTAMP(date_column) AS converted_timestamp FROM your_table;1.2 Oracle
时间戳转为日期
SELECT TO_DATE(timestamp_column, YYYY-MM-DD HH24:MI:SS) AS converted_date FROM your_table;日期转为时间戳
SELECT TO_CHAR(date_column, YYYY-MM-DD HH24:MI:SS) AS converted_timestamp FROM your_table;1.3 SQL Server
时间戳转为日期
SELECT CONVERT(DATE, DATEADD(SECOND, timestamp_column, 19700101)) AS converted_date FROM your_table;日期转为时间戳
SELECT DATEDIFF(SECOND, 19700101, date_column) AS converted_timestamp FROM your_table;1.4 PostgreSQL
时间戳转为日期
SELECT TO_TIMESTAMP(timestamp_column) AS converted_date FROM your_table;日期转为时间戳
SELECT EXTRACT(EPOCH FROM date_column) AS converted_timestamp FROM your_table;1.5 Spark SQL
时间戳转为日期
SELECT FROM_UNIXTIME(timestamp_column) AS converted_date FROM your_table;日期转为时间戳
SELECT UNIX_TIMESTAMP(date_column) AS converted_timestamp FROM your_table;2. 日期时间Datetime与字符串之间的转换
2.1 MySQL
日期时间转为字符串
SELECT DATE_FORMAT(datetime_column, %Y-%m-%d %H:%i:%s) AS converted_string FROM your_table;字符串转为日期时间
SELECT STR_TO_DATE(2023-11-23 12:30:45, %Y-%m-%d %H:%i:%s) AS converted_datetime FROM your_table;2.2 Oracle
日期时间转为字符串
SELECT TO_CHAR(datetime_column, YYYY-MM-DD HH24:MI:SS) AS converted_string FROM your_table;字符串转为日期时间
SELECT TO_DATE(2023-11-23 12:30:45, YYYY-MM-DD HH24:MI:SS) AS converted_datetime FROM dual;2.3 SQL Server
日期时间转为字符串
SELECT CONVERT(VARCHAR, datetime_column, 120) AS converted_string FROM your_table;字符串转为日期时间
SELECT CONVERT(DATETIME, 2023-11-23 12:30:45, 120) AS converted_datetime FROM your_table;2.4 PostgreSQL
日期时间转为字符串
SELECT TO_CHAR(datetime_column, YYYY-MM-DD HH24:MI:SS) AS converted_string FROM your_table;字符串转为日期时间
SELECT TO_TIMESTAMP(2023-11-23 12:30:45, YYYY-MM-DD HH24:MI:SS) AS converted_datetime FROM your_table;2.5 Spark SQL
日期时间转为字符串
SELECT DATE_FORMAT(datetime_column, yyyy-MM-dd HH:mm:ss) AS converted_string FROM your_table;字符串转为日期时间
SELECT TO_TIMESTAMP(2023-11-23 12:30:45, yyyy-MM-dd HH:mm:ss) AS converted_datetime FROM your_table;3. 日期Date与字符串之间的转换
3.1 MySQL
日期转为字符串
SELECT DATE_FORMAT(date_column, %Y-%m-%d) AS converted_string FROM your_table;字符串转为日期
SELECT STR_TO_DATE(2023-11-23, %Y-%m-%d) AS converted_date FROM your_table;3.2 Oracle
日期转为字符串
SELECT TO_CHAR(date_column, YYYY-MM-DD) AS converted_string FROM your_table;字符串转为日期
SELECT TO_DATE(2023-11-23, YYYY-MM-DD) AS converted_date FROM dual;3.3 SQL Server
日期转为字符串
SELECT CONVERT(VARCHAR, date_column, 23) AS converted_string FROM your_table;字符串转为日期
SELECT CONVERT(DATE, 2023-11-23) AS converted_date FROM your_table;3.4 PostgreSQL
日期转为字符串
SELECT TO_CHAR(date_column, YYYY-MM-DD) AS converted_string FROM your_table;字符串转为日期
SELECT TO_DATE(2023-11-23, YYYY-MM-DD) AS converted_date FROM your_table;3.5 Spark SQL
日期转为字符串
SELECT DATE_FORMAT(date_column, yyyy-MM-dd) AS converted_string FROM your_table;字符串转为日期
SELECT TO_DATE(2023-11-23, yyyy-MM-dd) AS converted_date FROM your_table;4. 字符串与时间戳之间的转换
4.1 MySQL
字符串转为时间戳
SELECT UNIX_TIMESTAMP(2023-11-23 12:30:45) AS converted_timestamp FROM your_table;时间戳转为字符串
SELECT FROM_UNIXTIME(1606119045) AS converted_string FROM your_table;4.2 Oracle
字符串转为时间戳
SELECT TO_TIMESTAMP(2023-11-23 12:30:45, YYYY-MM-DD HH24:MI:SS) AS converted_timestamp FROM dual;时间戳转为字符串
SELECT TO_CHAR(2023-11-23 12:30:45, YYYY-MM-DD HH24:MI:SS) AS converted_string FROM dual;4.3 SQL Server
字符串转为时间戳
SELECT DATEDIFF(SECOND, 19700101, 2023-11-23 12:30:45) AS converted_timestamp FROM your_table;时间戳转为字符串
SELECT CONVERT(VARCHAR, DATEADD(SECOND, 1606119045, 19700101), 120) AS converted_string FROM your_table;4.4 PostgreSQL
字符串转为时间戳
SELECT EXTRACT(EPOCH FROM TO_TIMESTAMP(2023-11-23 12:30:45, YYYY-MM-DD HH24:MI:SS)) AS converted_timestamp FROM your_table;时间戳转为字符串
SELECT TO_CHAR(TO_TIMESTAMP(1606119045)::TIMESTAMPTZ, YYYY-MM-DD HH24:MI:SS) AS converted_string FROM your_table;4.5 Spark SQL
字符串转为时间戳
SELECT UNIX_TIMESTAMP(2023-11-23 12:30:45) AS converted_timestamp FROM your_table;时间戳转为字符串
SELECT FROM_UNIXTIME(1606119045) AS converted_string FROM your_table;写在最后
在上述的介绍中你可以看到在不同数据库中如何进行时间数据的转换。这些可以帮助你更灵活地处理数据库中的时间信息确保你的数据分析和查询得以顺利进行。学海无涯苦作舟只争朝夕不负时
