在MySQL 中,AS OF TIMESTAMP 并不是一个标准的 SQL 语法或 MySQL 内置功能,用于直接查询历史数据状态。这个语法或概念更常见于 Oracle 数据库中,用于执行闪回查询(Flashback Query),允许用户查询数据库在过去某个时间点的状态。 如何使用 AS OF TIMESTAMP 的基本语法(在 Oracle 中) ...
versionsbetween [SCN|TIMESTAMP] [expr|MINVALUE] and [epxr|MAXVALUE] as of [SCN|TIMESTAMP]expr; 备注: 其中:column_name列名;table_name表名;between...and时间段;SCN系统改变号;TIMESTAMP时间戳;ASOF表示恢复单个版本;MAXVALUE最大值;MINVALUE最小值;expr指定一个值或者表达式。 SQL> --执行闪回版本查...
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关于NULL,复杂的是TIMESTAMP。对于TIME,DATE,DATETIME和YEAR都是允许NULL值的。 只有TIMESTAMP受变量explicit_defaults_for_timestamp的影响。 变量explicit_defaults_for_timestamp允许服务器对TIMESTAMP的默认值与NULL值的非标准行为,这些行为会产生一些莫名奇怪的行为,因此在8.0.18版本中,这个变量已经弃用。 在5.7版本,...
TIMESTAMP4 bytes4 bytes + fractional seconds storage As of MySQL 5.6.4, storage forYEARandDATEremains unchanged. However,TIME,DATETIME, andTIMESTAMPare represented differently.DATETIMEis packed more efficiently, requiring 5 rather than 8 bytes for the nonfractional part, and all three parts have ...
STAMP 类型的变量 DECLARE my_timestamp TIMESTAMP; -- 赋值 SET my_date = '2023-10-01'; SET my_time = '14:30:00'; SET my_datetime = '2023-10-01 14:30:00'; SET my_timestamp = '2023-10-01 14:30:00'; -- 查询变量的值 SELECT my_date, my_time, my_datetime, my_timestamp;...
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MySQL TIMESTAMPSummary: in this tutorial, you will learn about MySQL TIMESTAMP and TIMESTAMP column features such as automatic initialization and updating. Introduction to MySQL TIMESTAMP# The MySQL TIMESTAMP is a temporal data type that holds the combination of date and time. The format of a ...
Posted by developer: The Timestamp column in the mysql.tables_priv and myql.columns_priv grant tables was set to a zero timestamp value ("0000-00-00 00:00:00") for GRANT and REVOKE operations, preventing a logical restore of the grant tables. As of MySQL 8.0.28, a valid start time...
dateStrings: Force date types (TIMESTAMP, DATETIME, DATE) to be returned as strings rather than inflated into JavaScript Date objects. Can betrue/falseor an array of type names to keep as strings. (Default:false) debug: Prints protocol details to stdout. Can betrue/falseor an array of pa...