timestamp without time zone

时间戳(timestamp) 是一种计算机数据类型，表示一个时间点或某个时间段的起始点。而无时区的时间戳(timestamp without time zone) 则表示的是相对于UTC时间的时间差值，不考虑时区偏移量。

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TIMESTAMP WITHOUT TIME ZONE

A TIMESTAMP WITHOUT TIME ZONE is a data type in a database that stores a specific point in time, down to the second, without any reference to a particular time zone. This means that the timestamp is universal and does not change based on the location or time zone of the user or the server.

For example, if a user enters a timestamp of "2021-09-22 14:30:00" into a database with a TIMESTAMP WITHOUT TIME ZONE data type, it will be stored as it is. If another user in a different time zone accesses the same timestamp, it will still be displayed as "2021-09-22 14:30:00" without any conversion to their local time zone.

It is important to note that a TIMESTAMP WITHOUT TIME ZONE should not be confused with a TIMESTAMP WITH TIME ZONE, which includes an offset to indicate the time zone.

高斯数据库将time转为timestamp报cannot cast type time without time zone to timestamp without time zone

在高斯数据库（GaussDB）中，当你尝试把`time`数据类型转换为`timestamp without time zone`时遇到错误，是因为这两种数据类型有不同的含义和处理方式。

`time`表示的是从午夜开始到一天结束的时间，它不包含日期信息，只保留小时、分钟和秒。而`timestamp without time zone`则包含了日期和时间信息，但是没有时区部分，通常用于存储精确的日期和时间点。

如果你试图将`time`类型直接转换为`timestamp without time zone`，因为缺少日期信息，所以需要配合日期才能完成转换。正确的做法通常是先将`time`类型和某个日期（如当前日期）结合，然后再转换为`timestamp without time zone`。

例如，你可以这样做：

SELECT CURRENT_DATE + your_time_column AS timestamp_col FROM your_table;

这会将`your_time_column`加上当前日期，得到一个完整的日期时间，然后转换为`timestamp without time zone`。