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15 views

Confusion of Time Stamping Protocol and Two Phase Locking Protocol in schedule

I'm wondering if someone helps me. Actually, I have a little confusion in Concurrency Control Time stamping protocol and Two-Phase locking protocol in a transaction schedule. I have found this ...
0
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0answers
9 views

Moved MySQL server, new entries have wrong timestamp

Setup: Linux (Ubuntu 14.04) + MySQL Server 5.6 I've got a site where the website and MySQL server were running on the same machine, located in France. Now, I've gone ahead and moved the website and ...
1
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1answer
35 views

How can I set TIMESTAMP's default to future date?

I know I can set default value with current timestamp like this ... DEFAULT CURRENT_TIMESTAMP Is there any way to set the column with fixed amount of units based on current timestamp? ... DEFAULT ...
0
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1answer
28 views

Use system timestamp comparison in SELECT query

I have to backup some tables on a daily basis using the condition that the backup will be only for one previous day. I am planning to use copy to dump the records in to a csv file. I need help in ...
0
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2answers
102 views

How to set TIMESTAMP default value to 1970-01-01 00:00:01 UTC?

How can I set the default value for a TIMESTAMP column to be exactly 1970-01-01 00:00:01 UTC without changing time_zone? I tried the following: CREATE TABLE `foo` (`ts` TIMESTAMP DEFAULT CONVERT_TZ( ...
1
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0answers
12 views

Efficiently get records with latest timestamp per group [duplicate]

I have a table which roughly looks like this uuid uuid, id id, data text, last_updated timestamp Each row has an associated unique uuid. However, the key of interest is the id (indexed). ...
3
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2answers
319 views

What function to use with this timestamp?

I have timestamp (stored as BIGINT) format I cannot turn into a human-readable format: 1462975819250 It points to a date in 2016-may-11th. However function to_timestamp() turns this into: 48329-11-...
0
votes
2answers
31 views

Execute query using daily timestamp (mysql event)

I was trying to find a way for give users a daily "point" per online day. So my plan was setup a MySQL event to run this query: UPDATE users SET points=points+1 WHERE timestamp > "X" (Where X ...
0
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1answer
91 views

localtimestamp or curent_timestamp for default value

In Oracle-12c I have some columns that I am converting from timestamp with time zone to timestamp with local time zone. Some of those same columns also currently have a default value of ...
6
votes
2answers
130 views

Exists subselect vs inner join?

I'm moving up to the next level of my mystery query. It looks like there's a subselect inside of an exists, but on the same table. I think this could probably be simplified with an INNER JOIN higher ...
0
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0answers
29 views

How does the current_timestamp() or now() work? I am getting inconsistent results

current_timestamp() returns time ahead of current time and then returns current time upon subsequent request. Below are two requests i gave to the mysql server in commandline. I was not able to ...
1
vote
1answer
138 views

Converting UTC time to timestamptz always adds the +01 offset in Postgres

In Postgres 9.5, I do the following to convert a timestamptz to the UTC timezone: SELECT TIMESTAMP WITH TIME ZONE '2016-02-20 15:15:54.000495+01' AT TIME ZONE 'UTC' this outputs correctly 2016-02-...
1
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1answer
82 views

Filter created_at and count distinct minutes

I have this query to get records from a database: SELECT camera_id, count(*) AS snapshot_count FROM snapshots WHERE created_at >= timestamp 'yesterday' AND created_at < timestamp 'today' ...
3
votes
2answers
82 views

Generate a sequence of timestamps but skip given periods

I have a table things_to_do in PostgreSQL. For example: thing_id --------- 1 2 3 4 5 6 And I want to add a timestamp to every row: SELECT thing_id, '2016-02-10 19:57:00'::timestamp ...
14
votes
1answer
1k views

Why does time zone have such a crazy offset-from-UTC on year 0001 in Postgres?

In Postgres 9.5, I was surprised to see the result seen below while experimenting with year 0001 (no year zero 0000). Offset of -07:52:58? Some example code. Note that I mixed use of TIMESTAMP WITH ...
1
vote
1answer
45 views

Help with adding a time filter to Postgres query

I've asked this question over in SE GIS, but told it would be better suited to this SE, so here goes... I know Postgres is brilliant for grouping points based on their spatial values - that I can do -...
1
vote
1answer
80 views

SQL current timestamp

I have made a featureclass for a utility company where they can register measures set up to mitigate problems with rats, called "mitigation measure". From this feature class it is possible to state if ...
4
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1answer
284 views

Exchange rate table and conversion on the fly in query

I'm working on a small project and I'm have arrived to the point where I let a user chose in which currency to display items. I'm working with Java and my first thought was that I would use some kind ...
0
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1answer
40 views

Select Unique Fields with Max Values in Each?

I have a table with names, numbers, and timestamps on the data. I want to know how to select a unique instance of each name based on how recent the timestamp is. Addy (text), NW (number), UDate (...
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2answers
261 views

Automatically set timestamps for “create” and “modified”?

I have currently following SQL table: CREATE TABLE IF NOT EXISTS `xyz` ( `id` bigint(20) NOT NULL, `guid` char(36) NOT NULL, `ts_created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `...
0
votes
1answer
76 views

Filter column by records matching a timezone in Postgres

I want to check whether any rows in my column (TIMESTAMP WITH TIME ZONE) are not stored using UTC. Is there a query I can write to match values that are stored with a TZ offset of 1 or 8 or 11 or (not ...
2
votes
2answers
877 views

Default value for “microtime” column in MySQL

My interest is to store the time with FSP of 6. As I've read, this cannot be achieved with TIMESTAMP or DATETIME data types. So, I have a double field to store the output of the microtime function. ...
1
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1answer
180 views

Table replication with extra TIMESTAMP column on slave

I have a table on master and same table on slave with an extra column like InsertTime timestamp DEFAULT CURRENT_TIMESTAMP I want to keep record of time when there is update on slave. Replication ...
5
votes
2answers
3k views

How to best store a timestamp in PostgreSQL?

I'm working on a PostgreSQL DB design and I am wondering how best to store timestamps. Assumptions Users in different timezones will use the database for all CRUD functions. I have looked at 2 ...
3
votes
1answer
818 views

current_timestamp default column value working in Windows but not in Linux

This MySql query runs fine in Windows: CREATE TABLE `posts`.`table` ( `idTable` INT NOT NULL AUTO_INCREMENT, `Column1` DATETIME NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (`idTable`)); In ...
3
votes
1answer
718 views

How to get the difference in days between 2 timestamps in PostgreSQL

I have a table named accounts. I am interested in retrieving those accounts whose status has not been updated since more than 10 days. I thought about this query and it seemed to work but I am not ...
0
votes
1answer
44 views

Unix timestamp conversion

How can I output my Unix timestamps to human readable GMT? SELECT category ,fullname ,shortname ,idnumber ,startdate ,visible ,timecreated ,...
1
vote
1answer
214 views

PostgreSQL ODBC and Microsoft Access date/time in aggregate functions

I am trying to replace our MS Access 2003 databases with PostgreSQL 9.3. The first step is to use our MS Access front end to the upsized databases in PostgreSQL. Everything seems to work very well ...
0
votes
1answer
1k views

Postgres automatic insert time stamp with time zone (india) [closed]

Is there any way to insert timestamp with zone automatically when query is inserted ? (just like id auto increment as i don't want to pass the the parameters in sql as time its same every where if we ...
1
vote
2answers
131 views

Mysql date_add returns wrong row in python, right row in phpmyadmin [closed]

I am trying to get the first and last record from a month. In phpmyadmin I ge the correct result. In python I don't. In fact python returns the same row for both of these queries. First number is ...
1
vote
2answers
57 views

Organize repeating timestamped values in schema

I am creating models to hold some financial data. The information frequently is split into timestamped values, e.g: Some value, now | as of Jan 1st | as of Jun 1st | as of Sep 1st There are ...
0
votes
1answer
4k views

How to convert timestamp / rowversion to a date and time in SQL Server?

How to convert timestamp / rowversion to a date and time in SQL Server? I have several tables where I would like to track the last update, with column names like ModifiedAt, UpdatedAt, UpdatedDate. ...
1
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3answers
47 views

Last occurance of time relative to now()

What's the most elegant way to ask Postgres for the last 4:05pm relative to now()? I have been writing a fairly elaborate CASE with date_trunc's and my guess is it can be accomplished in a much ...
-4
votes
1answer
32 views

Get currentmilliseconds in postgres

I'm working on timestamp/datetime in my application. I'm using postgres db. What is the way to get current milliseconds (something like 1412706599000) in postgres?
0
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3answers
376 views

MySQL - How do I Calculate an Average Value Over a Period of Time When Only Value Changes are Recorded

I am tracking the sales price of various items, and I would like to calculate the average price of each item over a period of time. My simplified tables look like this: Items ------------------ |key ...
1
vote
2answers
204 views

fixed length table

I only have ever used mysql and storing data on .txt files. Currently I'm working with tick data (I have node.js on my server). My custom setup so far stores a fixed amount of tick data as comma ...
0
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1answer
155 views

Query MST instead of UTC for timestamps

on SQL Server, i'm trying to query all of last months data based off of the time stamp, however, all those timestamps are in UTC and i need them to be in MST (the reason is mainly for the end dates) ...
0
votes
2answers
377 views

Keep trailing zeros on Timestamp SELECT

This is the issue: I am reading rows with a timestamp column from a table and I need to make sure that the database returns the timestamp with a fixed width. But I am encountering instances where the ...
1
vote
1answer
107 views

DB2 LUW Timestamp differences in versions

Im new to DB2, my back ground is in MS SQL server 2000 thru 2012. I have a developer using Local DB DB2 LUW v9.7.500.4299 FIXPACK_NUM = 5 She is selecting some data from a table where the field ...
-3
votes
1answer
77 views

Timeline or time function in PostgreSQL

In MySQL I can use this select which show timeline view on data in my table/tables. SELECT COUNT(atribute), connection_timestamp FROM db GROUP BY DAYOFYEAR(connection_timestamp) ORDER BY ...
0
votes
1answer
72 views

What's the best database if i want save data temporally? [closed]

I want to create a datalog system so I need to store some int data temporally. What would be the best database (Relational, NO-SQL or some specific) for that purpose? And what would be the best way to ...
0
votes
1answer
54 views

How can I always get Timestamp in certain format without having to explicitly define it everytime

When I run a select on a timestamp I get something like: 2015-01-02T23:22:36.000Z, 1/7/2015 11:03:31 AM In order to format properly I have to do: SELECT to_char(entered, 'MM/DD/YYYY HH12:MI:SS AM')...
0
votes
1answer
36 views

Constrain Partial Values in Timestamp

I'm working on a some Create Table statements for a project I have. I have two columns (StartDate, EndDate) where the data type is Timestamp. One of the requirements is to ensure that the date is ...
1
vote
1answer
562 views

Select statement for selecting every week's log record

Here is a simplified version of the table in question: +------------------------------------------------------+ | DatabaseName | LogRecordNumber | LogTimestamp | +------------------------------...
0
votes
1answer
1k views

Oracle 11g r2: Cannot create partition on timestamp field

I have data with a timestamp field of the form '2014-01-01 00:00:00.99' in one of the columns. I want to create a new partition for the table every month. For this I did something like this. CREATE ...
1
vote
1answer
459 views

Calculating difference between consecutive timestamps. Error when i reach the hour mark

I am using MySQL I have a table that contains among other things an id a time in the format date:time (YYYYhhmmss) and a readingvalue. The difference between each reading value is 300 seconds but ...
0
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2answers
429 views

select rows where timestamp is a multiple of n seconds

I am logging live data to a database where it is then selected by a php script and posted to a graph on a webpage. A new datapoint is added every second and I have been graphing the most recent 300 ...
0
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2answers
3k views

mysql - query records to fetch by time stamp

I've a MySql 5.6 DB with a simple table (MyISAM) . | UniqueKey | TimeStamp | ------------------------- | 1 | 1024125412 | | 2 | 1024125413 | | 3 | 1024125414 | My table ...
0
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1answer
37 views

Choosing the Most Recently Entered Non-Blank Value When Many Values Exist

I have run into a problem where some IDs have multiple names associated with them. That is, if I have a location ID from one table and need to pull the location's name from another table based on the ...
2
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3answers
951 views

Constrain a postgres timestamp to “End of day”?

Given a table named bananas and a timestamp without time zone column named end_time and some psql clients have set timezone to 'UTC' and other psql clients have set timezone to 'US/Eastern' and the ...