SELECT DATE_PART('hour', date2::timestamp - date1::timestamp) AS hour_difference FROM your_table; DATE_PART 函数也可以用于提取时间间隔的特定部分,如小时。 3. 计算分钟差异 使用EXTRACT 函数: sql SELECT EXTRACT(MINUTE FROM (date2::timestamp - date1::timestamp)) AS minute_difference FROM...
12, 1) end_date = datetime(2020, 12, 5) print(d
在PostgreSQL中，我们拥有多种日期和时间数据类型，包括Date、Time、Timestamp和Interval。Date类型代表公历中的一天；Time类型则表示一天中的时间；Timestamp类型则结合了日期和时间，并可选地包含时区信息。而Interval类型则用于表示时间段或时间间隔，其单位可以是YEAR、MONTH、DAY、HOUR、MINUTE或SECOND等。此外，日期和...
在PostgreSQL 中,时间戳可以使用 timestamp 或timestamptz 数据类型表示。你可以使用内置的函数来对时间戳进行计算,例如计算时间戳之间的差值、增加或减少时间等。 下面是一些常用的时间戳计算示例: 计算两个时间戳之间的差值: SELECT timestamp1 - timestamp2 AS time_difference FROM table_name; 复制代码 增加或...
```sql SELECT DATE_TRUNC('month', '2023-10-05 14:30:00'::TIMESTAMP) AS truncated_date; ``` - **INTERVAL**:用于表示两个日期或时间之间的差值,可以进行加减运算。 ```sql SELECT '2023-10-05'::DATE + INTERVAL '1 day' AS next_day; ``` 通过这些基本操作,用户可以轻松地进行日期和时间...
SELECT DATE_PART('day', '2011-12-31 01:00:00'::timestamp - '2011-12-29 23:00:00'::timestamp); -- Result: 1 1. 2. 3. PostgreSQL-周中的日期差异 考虑使用 SQL Server 函数来计算两周中两个日期之间的差额: SQL Server: -- Difference between Dec 22, 2011 and Dec 31, 2011 in wee...
In PostgreSQL, the AGE() function, the minus operator “-”, and the EXTRACT() function is used to get the difference between two timestamps. The “-” operator and AGE() function return the timestamp difference as an interval. While to get the TIMESTAMPS difference in seconds, the EXT...
The PostgreSQL “TIMESTAMP” or “TIMESTAMP WITHOUT TIME ZONE” data type stores a timestamp value without the time zone information. In Postgres, the TIMESTAMP and TIMESTAMPTZ data types are similar; the only difference is that one includes the time zone information while the other doesn’t...
TimestampDifferenceExceeds(sendTime, now, wal_receiver_status_interval * 1000)) return; sendTime = now; /* Construct a new message */ writePtr = LogstreamResult.Write; flushPtr = LogstreamResult.Flush; applyPtr = GetXLogReplayRecPtr(NULL); resetStringInfo(&reply_message); pq_sendbyte(&...
StringInfoData buf;char*msgfmt;TimestampDifference(starttime, endtime, &secs, &usecs); read_rate =0; write_rate =0;if((secs >0) || (usecs >0)) { read_rate = (double) BLCKSZ * VacuumPageMiss / (1024*1024) / (secs + usecs /1000000.0); ...