Questions tagged [timestamp]

For questions about timestamp data types and/or recording a particular point in time.

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Postgres: why does to_timestamp return the date with different timezones, in the same query?

Why does to_timestamp use different timezones to display epochs, in the same query? Note +02 vs +01. => select to_timestamp(1651157248),to_timestamp(1647224832); to_timestamp | ...
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1 answer
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Inserting a "date-time" into TIMESTAMP column -- "Incorrect datetime value"

I have a date-time data that comes in this format: 2016-02-10T12:00:00.000Z I've created a MariaDb database and a column for that date of type TIMESTAMP However, when inserting the data into the ...
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TimescaleDb : How to store long time events?

I’m trying to use TimescaleDb to store long time events (events started for example 2 days ago and ended 1 hour ago). There are two types of events (current events without end date and historical ...
2 votes
1 answer
85 views

Is there a way to use time series databases effectively without absolute timestamps?

I have multiple sets of scientific data (European Data File files for EEG data) that I am reading in via MNE Python. Each EDF can be read in with a Numpy array that contains the time basis, say 0.00, ...
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1 vote
1 answer
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Recommended way to index a timestamp column in postgres?

I have a PostgreSQL table called tickets_details, which has many columns and is constantly updated only on the rows of the current day, it also inserts thousands of rows of the current day that have ...
0 votes
0 answers
42 views

Migrate timestamp from SQL Server to MySQL

I'm trying to replicate data from a MSSQL server into a MySQL server. To that end I'm using a linked server with ODBC driver 5.3. I have a version column that is defined as timestamp both in the MySQL ...
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1 vote
1 answer
133 views

Why does PostgreSQL keep resetting my date to the wrong "timezone", with "seconds", as I try to remove it?

I asked this question at first: https://stackoverflow.com/questions/71979003/why-does-strtotime-get-confused-about-timezones-instead-of-ignoring-them-an I have this timestamp with timezone column ...
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0 votes
1 answer
330 views

Time zone lost when returning timestamp with time zone from a function

I have this function: CREATE OR REPLACE FUNCTION laborable_day(dtDateTime TIMESTAMP WITH TIME ZONE) RETURNS TIMESTAMP WITH TIME ZONE AS $$ DECLARE _isHoliday BOOLEAN; BEGIN LOOP SELECT COUNT(*...
0 votes
1 answer
508 views

Why do I see the timezone offset displayed in PgAdmin, for a timestamp with timezone

I'm using PgAdmin 4 v6, and for some timestamp data with data type of timestamp with time zone, I'm seeing it in PgAdmin like this: 2022-03-06 16:11:33+04 Why is the +04 being displayed? I've looked ...
0 votes
1 answer
104 views

Goldengate timestamp (FFF)

Working with Goldengate 19.1.0.0.211019 replicat inbound to Oracle 19.0.0.0.0 consuming a trail file incoming from Nonstop (ie a non-Oracle database). Column in question from Nonstop is a string ...
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0 votes
1 answer
997 views

MySQL 8.0 timestamp CURRENT_TIMESTAMP sets date to '0000-00-00 00:00:00' (was ok in 5.7)

The table T has this field +---------------+--------------+------+-----+-------------------+-----------------------------+ | Field | Type | Null | Key | Default | Extra ...
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2 votes
2 answers
2k views

Does the timestamp type have (hidden) milliseconds?

The updated column was created as | updated | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | a simple SELECT gives +---------------------+ | updated | +--------------...
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1 vote
1 answer
118 views

Storing timezoned HH:MM in PostgreSQL

My application needs to send a daily email to users at a time of their choosing, the timezone is also defined by the user itself. What's the best way to store HH:MM + timezone? And how can I ...
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0 votes
1 answer
701 views

How to GROUP by month & year with an epoch timestamp in AWS Redshift

Assuming a very simple schema as pictured below. (unfortunately the column is actually named timestamp) How do I simply get a count on records grouped by YEAR & MONTH
1 vote
1 answer
2k views

Time zone conversion in PostgreSQL without timezone does the opposite operation

Query: SELECT TO_TIMESTAMP('2021-10-24 20:00', 'YYYY-MM-DD hh24:mi') as d, (TO_TIMESTAMP('2021-10-24 20:00', 'YYYY-MM-DD hh24:mi') at time zone 'utc')::timestamptz at time zone 'ASIA/CALCUTTA' ...
1 vote
1 answer
121 views

Convert Varchar to Interval

I have a Postgresql column that is a varchar that is saving a string that looks like '2 years, 5 months' or '3 months' or '9 years, 0 months'. I can't convert the column to an interval because it's ...
0 votes
3 answers
64 views

Statement of total precipitation for each hour, day or month

I store the data from the rain gauge in mySQL and needed help with listing the data. I save the data every 5 minutes and use the save date in the form of a timestamp. At the end of each hour, ...
-2 votes
1 answer
670 views

query to get start time and end time from same column based on boolean value order by primary key [closed]

As of now, this is my current query: SELECT MAX(CASE WHEN status = 1 THEN [timestamp] END) as machineOn ,MAX(CASE WHEN status = 0 THEN [timestamp] END) as machineOff FROM machine_table where ...
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How can I get all rows whos timestamp is closest to midnight (sampling timeseries)

I have a table that counts the amount of user interaction with a given item. Basically it has a table with 3 rows (item_name, time, num_interactions). The number of interactions never decreases, it ...
7 votes
2 answers
690 views

Is there a performance or storage space advantage to lowering time/timestamp precision in PostgreSQL?

PostgreSQL allows time/timestamp to specify a precision: time, timestamp, and interval accept an optional precision value p which specifies the number of fractional digits retained in the seconds ...
-1 votes
1 answer
712 views

PostgreSQL Query - how to subtract timestamps and format durations (with builitin functions or otherweise)

I am looking for a solution to a problem with a select statement where I am trying to display the sleep duration. Sleep Table Here is the select statement I have so far: select wakeuptime,hour from ...
1 vote
1 answer
418 views

Why can't I use ALTER to set the default on a column?

Long story short, I have a table with a TIMESTAMP column where I want to make the default CURRENT_TIMESTAMP (default currently is 1971-01-01 00:00:00). This is part of a WordPress plugin, and so ...
-1 votes
1 answer
36 views

How to catagorize timestamp based on hours in postgreSQL [closed]

I am trying to categorize the timestamp by the HOUR using the arrival column categories like ['00.00 - 06.00', '06.00 - 10.00', '10.00 - 14.00', '14.00 - 18.00', '18.00 - 00.00']). I am very new to ...
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2 votes
1 answer
209 views

What is the reasoning behind PostgreSQL changing the timezone when changing a timestamp with time zone field?

I have a table with a "timestamp with time zone" column. For one row, it had this value: 2021-06-24 00:00:00+02. Then, I edited and saved it to be: 2021-06-24 11:00:00-05. Note that both the ...
3 votes
1 answer
302 views

Force NOW to return new timestamps without committing the transaction

I'm aware that, in PostgreSQL, the return value of NOW() is the transaction begin timestamp. So if you use NOW() multiple times in the same transaction it will always return the same value. And that's ...
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0 votes
1 answer
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Date calculations give different results in different environments

This query: WITH RECURSIVE cte AS ( SELECT 0 n UNION ALL SELECT n + 1 FROM cte WHERE n < 20) SELECT n, ('2020-04-13 00:00:00 Europe/Berlin'::timestamptz - make_interval(days => ...
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2 votes
1 answer
215 views

Add a number of days to a timestamp

I'd like to add (or rather subtract) a number of days from a timestamp. For example from 2020-04-13 00:00:00 Europe/Berlin I want to subtract 20 days and I expect the result to be 2020-03-24 00:00:00 ...
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5 votes
1 answer
620 views

How does PostgreSQL store timestamp internally?

In case of MySQL, TIMESTAMP values are stored as the number of seconds since the epoch ('1970-01-01 00:00:00' UTC)` In case of PostgreSQL with the version less than or equal to 9.6 timestamp values ...
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3 votes
1 answer
923 views

Is it possible to automatically generate a Unix millisecond timestamp in MySQL 5.7

I have created a created_time field with BIGINT in a MySQL 5.7 table, now I want to auto generate a Unix millisecond timestamp when I insert a record. Is it possible to do this? I have tried the code ...
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0 votes
2 answers
4k views

MySQL - Truncated incorrect datetime value

I need to migrate some data from between to tables. The first has a varchar(255) field where a date is stored. I want to insert that date in a timestamp field in the second table. The varchar field ...
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3 votes
1 answer
511 views

Cross join table row with generate_series

Currently I have SELECT x, plans.name FROM plans CROSS JOIN generate_series(timestamp '2021-01-01 06:00' , timestamp '2021-01-07 22:00' , interval '1 hour') ...
1 vote
1 answer
93 views

Getting the latest timestamp in Oracle

I am trying to create a report that has the latest member id in the first column and the old member id in the second column based on the timestamp in audits table below. Member ids are stored in ...
0 votes
3 answers
887 views

Unix timestamp vs timestamptz index performance [closed]

I'm new to the world of DB admin and have a large table (2 billion rows) of cryptocurrency tick data for multiple currencies in a Postgres database. Most of my queries will involve selecting a moving ...
-1 votes
2 answers
245 views

How to create an index based on a time-based function in postgres? [closed]

I have a function called hot_rank to rank posts, based on their score, and their newest_comment_time (basically a decaying power function): create or replace function hot_rank( score numeric, ...
0 votes
3 answers
560 views

What is the difference between these extracting date method?

Assuming I have a table called MyTable, with a TimeStamp field "Created". I want only extract the Date part of this column, and in my research I found these alternatives: SELECT created AS &...
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-1 votes
2 answers
380 views

Purpose to use timestamp datatype in sql server? [closed]

What is the purpose to use timestamp datatype in sql server? Do you have a concrete example of using timestamp in real business case? When is it relevant to use timestampe datatype? Thank you!
0 votes
1 answer
119 views

sql backup restore converts createdAt to local TZ

I have a remote MySQL DB in the cloud on JAWSDB. I have createdAt and updatedAt timestamps for records that are in UTC TZ. I'll backup these DBs using mysqldump -h HOST -u USER -p > backup.sql. I ...
0 votes
1 answer
519 views

Select count of timestamp formatted field in short date format to give number of rows

I have a field titled DTUpdated and it is a timestamp field. I am trying to select a count of the dates in the rows that are xx old. i.e. 0-3 months, 3-6 months etc. I am not at the writing date ...
1 vote
1 answer
1k views

What value should I choose as length for timestamp without timezone in PostgreSQL?

I'm currently setting up a database to populate it with big data. All the data I get comes from Valve's Steam Web API. Therefore, as all timestamps are returned in Unix timestamps, I cannot directly ...
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0 votes
0 answers
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Is it possible to record read access to a row?

A table has a creation timestamp column with DEFAULT and an update timestamp column with DEFAULT ... ON UPDATE .... Similar to the ON UPDATE|DELETE ... constraint, we're looking for a way to have a ...
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0 votes
2 answers
74 views

use of age() function postgres [closed]

I am trying to calculate the time since an event took place. The event timestamp will itself be the result of a MIN aggregate function. Is there a way to do this. I have run a query to get the ...
0 votes
1 answer
734 views

When I set Datestyle to 'SQL, YMD' all queries still return as 'SQL, MDY'

I am working on a database migration from Oracle 12c to Postgresql 12. We must keep the same date format as the program interacting with this database is written in COBOL and should not be changed. ...
0 votes
0 answers
89 views

Fix the timezone of timestamp in MySQL

From my misunderstanding, I stored time as timestamps and thought they were stored as UTC+0. But I moved into a different country and found the timestamps were stored in the local time. The issue is ...
0 votes
1 answer
1k views

In which timezone does psql display "timestamp without timezone"?

What I mean is the following: if I create a timestamp without timezone (timestamp) column and store there some value, internally microseconds are stored, but when issuing select this is converted to a ...
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0 votes
1 answer
63 views

How can I add timestamp into my table when I use Write-DbaDbTableData?

I am trying to use one table to store the SQL server disk space checking data by dbatools: $allservers_PRD | Get-DbaDiskSpace | Write-DbaDbTableData -SqlInstance MySQL2019 -Database SQL_DBA_TASK -...
0 votes
1 answer
182 views

SQL - Spilt timestamp into multiple rows

I am dealing with data that needs to be looked at on a shift-to-shift basis (8:00:00 to 20:00:00 and its reciprocal are the two shifts) There are instances where a timestamp (one row) will span longer ...
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1 vote
0 answers
100 views

Correcting wrong timezones/timestamps in existing tables

I did a huge mistake because I didn't know how the TIMESTAMPTZ datatype works in postgresql. We need to store sensor data from a handful of different sources. We have a few tables with two timestamp ...
3 votes
1 answer
28 views

Using Postgres param in a function

I'm trying to create a few functions to make the SQL queries between my SQLite and Postgres DB's the same. One thing I would like to do is change a timestamp to a double via a function such as: create ...
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2 votes
1 answer
2k views

MySQL Best approach for recording last update timestamp for every column and every row

This question is about possible approaches for time stamping every column of every row in a table. I have a table with a small number of rows (fewer than 200 and not likely to grow much larger). Each ...
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0 answers
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Column with timestamp datatype not having proper value

I am using PostgreSQL v9.5 A column utime with datatype timestamp without timezone is not having proper values for some rows as given below: select utime from mytable where utime is not null order by ...
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