Questions tagged [timestamp]
For questions about timestamp data types and/or recording a particular point in time.
0
votes
0answers
18 views
Performance impact from redundant casting of timestamp values in Postgres queries
I am inheriting some Postgres queries where there are some redundant casting for timestamp columns such as timestamp without time zone, timestamp, etc. for columns which will be implicitly be of ...
-1
votes
0answers
13 views
Start-Stop product production gantt Mysql
Ciao a tutti,
i have this database :
timestamp product value
-------------------------------------------
2018-11-26 09:00:03 13 1
2018-11-26 09:00:13 13 1
...
0
votes
1answer
25 views
I need help creating an index for timestamp
I have a query taking too long.
This is the table:
mysql> describe parking_data;
+----------------+--------------+------+-----+-------------------+----------------+
| Field | Type ...
1
vote
0answers
17 views
Query that fetchs average values over timestamp range of time, on a certain value of another pair of fields
This is the situation, over the time our table reached around 800 millions rows. And it is going to get bigger and bigger. It is a service that collects metrics of energy (voltage, power, current, etc)...
3
votes
1answer
59 views
How to compare timestamps with different time zones?
For example I have a table with timestamps:
2018-04-05 06:00:00 +01
2018-04-05 06:00:00 +00
2018-04-05 06:00:00 -01
2018-04-05 04:00:00 -01
And I want to get entries that are ...
...
2
votes
1answer
425 views
Convert YYYY-MM-DD date (without time zone) to unix timestamp in Postgres
I've got a column of type date with the following value format: YYYY-MM-DD (eg. 2018-08-03). I want to get the unix timestamp equivalent of the dates, but without the timezone.
F.e. the date 2018-08-...
1
vote
2answers
60 views
How can I use Spatial Indexes for timestamps (non-spatial 1d data)?
I'm using MySQL 8.0. I have some table containing TIMESTAMP column and I need to select within TIMESTAMP range:
SELECT *
FROM t_tbl
WHERE ts BETWEEN @someDate1 AND @someDate2
I want to make this ...
0
votes
0answers
33 views
Primary key based on high-resolution timestamp generated on client
I'm seeking a primary key for my relational database (Postgres) tables that:
Can be generated on the client and has a low chance of collisions
Can support fast (and possibly clustered) indexes.
Will ...
2
votes
1answer
154 views
Error while inserting into array of timestamps
Im using postgres 10.1 and the Datestyle config is the following
DateStyle
-----------
ISO, MDY
Im having this error
ERROR: date/time field value out of range: "1535673858" Hint: Perhaps
you ...
3
votes
1answer
117 views
Why does PostgreSQL interpret numeric UTC offset as POSIX and not ISO-8601?
Setting time zone as numeric offset (without abbrev, thus IMO not in POSIX format) is still interpreted by PostgreSQL as POSIX format:
SET TIME ZONE '+02:00';
At least I assume, because checking the ...
3
votes
1answer
30 views
Why does postgresql differentiate between named and numeric time zone notations? [duplicate]
Why is there a difference between named timezone and numeric timezone offset, both of which yield different UTC timestamps for TIMESTAMPTZ?
Assume Europe/Prague timezone, which is currently +02:00 (...
0
votes
1answer
75 views
Calculate Total Working Minutes in MySql
I have a design a table for attendance and here are the genral fileds
AttendanceMachineLoginId
EmpId
AttendanceDateTime
Whenever user will come to office, he has to make his attendance.
The first ...
1
vote
2answers
97 views
What is the best smallest data type size for 19 digit number?
I'm using this code to get a mix of Date and Time to use it like a unique ID
DateTime.Now.ToString("yyyyMMddHHmmssfffff")
In SQL Server 2017 I'm confused as to which best smallest size of data type ...
0
votes
1answer
432 views
Converting unix timestamp to an sql timestamp in postgres
I have passed Date.now() and other plain unix timestamps like 1534360109480 into sql and ran them through this.
"@converted_date" = to_timestamp("@date") AT TIME ZONE 'UTC';
And it consistently ...
0
votes
0answers
31 views
Duration of consecutive timestamps by group in sql
I am new to psql window functions and would like to perform a query on test_table in order to find out every instance of inactive outages per mobile_id, country, and brand and most importantly the ...
-1
votes
1answer
59 views
MySQL - Change Default TimeZone changed all values in TIMESTAMP column
I have a few columns with the data type TIMESTAMP. Initially the timezone was default. So I have added the values like this.
mysql> create table test (t1 timestamp, t2 datetime);
Query OK, 0 rows ...
8
votes
3answers
3k views
Can CURRENT_TIMESTAMP be used as a PRIMARY KEY?
Can CURRENT_TIMESTAMP be used as a PRIMARY KEY?
Is there a possibility that two or more different INSERTs, get the same CURRENT_TIMESTAMP?
3
votes
1answer
127 views
Is there a strategy to use timestamp as primary key?
The majority of times we use integer sequences for primary keys to maintain uniqueness of row in a table. Couldn't we use timestamps instead of integers for this purpose? Is there any flaw in that ...
0
votes
2answers
57 views
Postgres - using aggregate functions to return a different column?
I currently have a table containing raw temperature data that looks like this:
I have written a query to find the min, max and avg of this data grouped by the date of the timestamp:
drop table ...
0
votes
2answers
43 views
Mysql 5.6 general log file output not showing unix timestamp
Mysql 5.6 general log file output not showing unix timestamp, so i wonder if there an option that i can execute to enable unix timestamp while logging general queries ?
UPDATE : Here is example for ...
1
vote
1answer
143 views
timestamp with timezone issue with TZR vs TZH:TZM
I have a Hibernate with Oracle JDBC based application inserting/updating into the following column;
COLUMN_A TIMESTAMP WITH TIME ZONE DEFAULT systimestamp NOT NULL
but while it automatically appends ...
0
votes
1answer
62 views
Timestamp and substring with regular expression
I am using postgresql and I have the following table
Table "public.test"
Column | Type | Modifiers
--------+--------------------------+-----------
name | text ...
4
votes
2answers
62 views
Get total amount of time between records when changed state
I have a table, showing the status (healthy, broken) for each device at a given timestamp. I need to get the total amount of time of a whole breakdown.
So the data is stored like this:
device_owner ...
1
vote
2answers
661 views
How are SQLServer Timestamp/RowVersion Values Created?
I am relatively fresh to SQLServer's use of ROWVERSION/TIMESTAMP data, and normally just query for required rows based on modified dates.
How is the ROWVERSION assigned to a new row in a database? ...
3
votes
2answers
70 views
Joining tables based on time and distance: PostGIS with PostgreSQL?
I have a table with several thousand rows that contains time and position data. Rows with the same group_id have the same timestamp. Lets call this table "Small":
Small Table:
id event_time ...
2
votes
2answers
82 views
AT TIME ZONE direction changes based on column having a timezone [duplicate]
Why does Postgres do the opposite thing for TS with and without Timezones? In one case it adds hours, in the other case it subtracts. Just to confuse things more, when specifying GMT+x, the hours ...
1
vote
2answers
59 views
Docker for Oracle Timestamp out of sync
I have created an Oracle Database Docker Image with the help of this link
SYSTIMESTAMP shows UTC time and not my local machine's time.
kaushik:~ knayak$ date
Fri Jun 8 17:46:35 IST 2018
select ...
3
votes
2answers
94 views
Is there a way to avoid having chained/nested “replace()” items when using an ISO 8601 timezone offset value in a generated column?
I am using MySQL 5.7 and have a table that has the following columns that are being used to store some data that is source from an Apache common log formatted access log; details extracted from a ...
0
votes
1answer
157 views
Batch update timestamp records to correct timezone
I'm looking to batch update some timestamp records in postgresql.
My app was storing timestamps to the timestamp column (without timezone) in the the wrong timezone (BST). I only noticed a while ...
3
votes
3answers
222 views
Is timestamptz preferred when timezone logic is performed by the client?
I'm in the process of migrating a web application from SqlServer to PostgreSQL and I'm trying to figure out which type to replace datetime2 with.
The general advice seems to be always use timestamptz,...
0
votes
3answers
2k views
Compare timestamp type columns in SQL Server
I am trying to get data since last timestamp. In my legacy database, all tables have a column named as recordStamp type timestamp. I want to rely on this to select records modified after the max(...
2
votes
1answer
225 views
Update value in timestamptz column
I have a table column with the data type timestamptz. Time zone of server is America/Denver. Going through some strange issue while inserting a value in that column.
When I update the column to the ...
1
vote
1answer
157 views
Formatting Timestamp in Default Constraint
Can you format a TIMESTAMP WITH TIME ZONE column in a CREATE TABLE default constraint in Postgres v10.x?
Example Code:
create_date TIMESTAMP WITH TIME ZONE
DEFAULT to_char(current_timestamp, 'DD-...
3
votes
1answer
60 views
Return values at more/less specific time points
In PostgreSQL 10.0, I have a big table with two columns:
CREATE TABLE xs (
ts timestamp with time zone NOT NULL,
x integer NOT NULL
)
Now, if I have 100 given time points, how do I return ...
1
vote
1answer
2k views
DB2 - Inserting a timestamp operation result in a timestamp field [closed]
I got a some javascript Dojo code assembling a query from JSON variables and I have been trying to insert a timestamp in it.
This is my test table (schema.mdummy):
k and v are varchars
n is an ...
1
vote
2answers
62 views
Is there a way to specify an table/index is sorted by more than one column?
Suppose I have a table:
CREATE TABLE [dbo].[TestTable]
(
[Id] INT NOT NULL PRIMARY KEY CLUSTERED IDENTITY(1,1),
[Timestamp] DATETIME2(7) NOT NULL DEFAULT (SYSUTCDATETIME()),
[Data] INT ...
2
votes
1answer
2k views
How can I set a default now() timestamp in a timestamp array?
I want to have a timestamp array which tracks a series of events. The first event always happens when the row is created, so I want the array to be instantiated with an initial default value. I've ...
0
votes
0answers
378 views
MySQL SELECT query displays TIMESTAMP values with zero month, day, hour, minute, and second
I am attempting to insert some TIMESTAMP values into a MySQL table. While I can successfully insert a TIMESTAMP value into the relevant field, when running a simple SELECT query on that data, MySQL ...
0
votes
0answers
20 views
What does the Read Timestamp of a data item store?
"R-timestamp(Q) denotes the largest timestamp of any transaction that executed read(Q) successfully."
Does the above statement mean "read-timestamp of data item Q will store timestamp of the ...
1
vote
1answer
562 views
How can I change TIMESTAMP to TIMESTAMP(3)?
I have a column of TIMESTAMP, NOT NULL, DEFAULT CURRENT_TIMESTAMP.
I want to modify it as TIMESTAMP(3).
I tried
ALTER TABLE <table>
MODIFY COLUMN <column>
TIMESTAMP(3) NOT NULL DEFAULT ...
0
votes
1answer
680 views
Cursor Based Pagination for Timestamp field with non-unique values
We are trying to create a query for the following table :
CREATE TABLE `Action` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`vendor_Id` int(10) unsigned DEFAULT NULL,
`name` varchar(60) ...
1
vote
1answer
352 views
Find a closest match in the same table
I have a table with timestamped data. For all the rows, I want to find the row that is the closest to 20 minutes after and between 15 and 25 minutes after.
e.g. if the table is like
CREATE TABLE foo(...
0
votes
2answers
2k views
How to sync MySQL's time with system time without mysql restart?
On my machine I have a service to synchronise the SYSTEM time (including Time zone), and would like the DB will synchronize with the machine time once in a while.
When I change SYSTEM time, MySQL ...
2
votes
1answer
1k views
Poor query performance over timestamp range by week in PostgreSQL 9.3
I have a slow query that generates a report of account activity per week over the past year. The table currently has nearly 5 million rows and this query currently takes 8 seconds to execute. The (...
1
vote
1answer
2k views
dual table postgres doesn't return timestamp
I am trying to select now() from my local postgres database dual table:
select now() from dual;
It returns no rows. Just prints column name now(yyyy-MM-dd HH:mm:ss.ffffff)
What is it that I am ...
1
vote
2answers
287 views
Timezone offset displayed though it shouldn't be stored
I new to Postgres and v9.6.3 on a Linux system.
From the docs and the PostgreSQL: Up and Running book, I learned that the timestamptz type just subtracts the offset of a timestamp on insertion and ...
2
votes
1answer
3k views
Postgresql update timestamp without timezone to have timezone
When I created the table, a Timestamp column without timezone was created. All the imported time is in UTC. Now I want to add the timezone information explicitly, and I have altered the column
ALTER ...
0
votes
1answer
449 views
Sum duration for each day of a month
Question: I would like to create a query that can return a list of all days of the month with a sum of all duration for each day including zero for each day that has no data.
Database: PostgreSQL 9.x
...
2
votes
1answer
10k views
PostgresSQL date/time field out of range on seconds-since-epoch
I am importing a csv file into a PostgreSQL database. Most of the file imports without any trouble until I get this message
ERROR: date/time field value out of range: "1421088300"
HINT: Perhaps you ...
1
vote
2answers
296 views
MYSQL ways to represent '1970-1-1 0:0:0'
Out of interest, are there any other ways of representing the timestamp '1970-1-1 0:0:0' other than from_unixtime(0)?
In PostgreSQL there is 'epoch'::timestamp. Would there be an equivalent in MySQL ...
