Questions tagged [time]

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When you use English time strings in PostgreSQL, does it base it on the current timestamp or the previous midnight? [closed]

Suppose I have this query: SELECT * FROM table WHERE timestamp < now() - INTERVAL '3 weeks'; Will this return all records which have a timestamp older than: "right now, minus the average ...
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1answer
33 views

WITH-clause not pre-calculated, lineal resource wasting, why?

I'm trying to save resources, and shorten code, but getting lineal resource wasting with "WITH-clause". This is my base example: #!/bin/bash echo "CREATE TABLE 'clients_table' ( id ...
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1answer
38 views

Calculate time difference in minutes

I am Amazon Redshift. I tried to calculate the time difference between two time stamp columns in minutes, but the timestampdiff function does not work on it. The error is telling me that minute column ...
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2answers
60 views

What can cause higher CPU time and duration for a given set of queries in trace(s) ran on two separate environments?

I'm troubleshooting a performance issue in a SQL Server DR environment for a customer. They are running queries that consistently take longer in their environment than our QA environment. After ...
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1answer
159 views

How to get non-overlapping distinct intervals from a PostgreSQL table?

Using postgresql 9.6. The table has user sessions and I need distinct non overlapping sessions printed. CREATE TABLE SESSIONS( id serial NOT NULL PRIMARY KEY, ctn INT NOT NULL,...
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72 views

How get info about duration of activity in time from MySQL table?

I have MySQL table "sessions" with columns bellow. In this table I have information about start and end every session which was iniciated from specific IP. In some cases for technical ...
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1answer
32 views

Function to convert time difference between two dates into timer format

Does anyone have a function that converts date difference between two dates into timer format ? For example: select udf_DateDiffTimer ('2020-05-12 14:12:34','2020-05-12 14:12:35') The result should ...
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1answer
23 views

Same server, same query, different response time

I have a development server that has some problem to access the data, user reporting that it's too much slow sometimes. The setup is: * virtual server; * 4 virtual CPU; * 8 GB of virtual memory ; * ...
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1answer
27 views

Same query on same same table, different response time

I have a development server that has some problem to access the data, user reporting that it's too much slow sometimes. The setup is: * virtual server; * 4 virtual CPU; * 8 GB of virtual memory ; * ...
0
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1answer
32 views

Dates, Times and Timezones - How are they incorporated in Interval?

Does interval '1 month' incorporate month differences and leap years when calculating date/datetime boundaries? If so, how does it work? I was asked this question, and I'm not sure how to answer it. ...
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0answers
34 views

create_time in sys.dm_xe_sessions is in the future

I have run the following query which shows the running XE sessions on the server: SELECT name, create_time FROM sys.dm_xe_sessions and I get the results +-------------------------------+...
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1answer
61 views

Align values to 5 minute intervals

I have values inserted with random intervals in the table. I would like to fetch the first (if exists) value in (say) 5 minutes interval. So is required to have 5 minutes column and the values column ...
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1answer
36 views

calculate days spent of all visitors from encounters

I have an encounters table CREATE TABLE visitors( id serial PRIMARY KEY, start_date TIMESTAMP NOT NULL, -- visitor_id bigint NOT NULL -- skip for now, end_date TIMESTAMP ); (end_date can be ...
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1answer
34 views

Lock database in time

I'm currently working with prototyping some stuff with a dump of a MySQL (5.7) database where much of the data is time dependent. Most of the queries I write use the NOW() function and the results ...
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2answers
1k views

Operand data type time is invalid for add or subtract operators

I'll to calculate how many hours a person has worked on SQL server. For that I'm storing the Arrival, Departure and Break in my database table as time(7). A bit for DepartureNextDay determinate that ...
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1answer
34 views

time difference between two machines makes problem in service broker communication

I have two machines and each machine has a SQL Server instance. Between these machines I run service broker. One of my machines has a different time from the other. I mean the machine time of A is 9:...
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1answer
41 views

Calculating the elapsed time of Oracle Database Startup operation

I'm trying to calculate the elapsed time of Oracle Database startup command. The view V$INSTANCE contains the STARTUP_TIME column which tells at what time the database is started. But, i need way to ...
2
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1answer
57 views

Sum values by time

id_ | date_ | hour_ | in_|out_| |…. | …. | …. | …. | …. |19 | 2018-12-12| 18:15:00| 1 | 3 | |19 | 2018-12-12| 18:30:00| 1 | 0 | |19 | 2018-12-12| 18:45:00| 2 | 4 | |...
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1answer
402 views

Database design for a timesheet app?

I'm designing the database schema for a time tracking application and I need a little piece of advice. The application must permit the user: To enter for each day of the week the amount of time he ...
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1answer
566 views

datetime row created

I have sqlserver DB , and there I have few tables. I have 1 table that not save each row what is the datetime the each row created. Is there any way to know when which row was created? Is there any ...
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1answer
1k views

SSIS - converting string to HH:MM:SS

I am trying to read flat file with some data and I need to convert some columns to time type in the format of HH:MM:SS. Below is the example how they are stored in the file (on the left) and how I ...
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1answer
1k views

Date and time period query

I would be very grateful if someone can help me here: in my database, I have prices recorded at a particular time in a day over years. So for each vendor or station, there can be several price data ...
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1answer
328 views

MariaDB query time in profile not match

From a MariaDB 10.1 database with the profile enabled. After making some test with an example query, why the time reports from the query doesn't match the duration time that the profiles report? I ...
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1answer
7k 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 ...
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2answers
3k views

How should I represent a midnight end time?

I have a table which represents time ranges. Column | Type | Modifiers -------------+----------------------...
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0answers
93 views

Why do queries on two tables with the same structure have different execution times

I have partitioned a large table in a PostgreSQL database into monthly child tables with the same structure and similar numbers of rows. Recently I have noticed that the newer tables take much longer (...
2
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1answer
88 views

Select where next row's value is greater

I have a road_insp table. create table road_insp ( insp_id int, road_id int, insp_date date, condition number(38,2) ) ; insert into road_insp (insp_id, road_id, ...
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1answer
437 views

What is a valid use case for using TIME WITH TIME ZONE?

Along the lines of this related question: What is a valid use case for using TIMESTAMP WITHOUT TIME ZONE Are there any valid use cases for actually using TIME WITH TIME ZONE or should it be ...
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3answers
4k views

Join 2 tables by closest time, PostgreSQL 9.6

I have 2 tables: tbl1, tbl2. CREATE TABLE tbl1(time_1) AS VALUES ( '2017-09-06 15:26:03'::timestamp ), ( '2017-09-06 15:26:02' ), ( '2017-09-06 15:28:01' ), ( '2017-09-06 15:40:00' ); CREATE ...
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2answers
183 views

How to add index to increase speed of mysql statement

How do I increase the speed of this mysql statement? taking 1.10s but was wondering if it could be made faster. SELECT res_rooms.room_id AS room, res_rooms.type AS room_type, ...
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1answer
1k views

May postgresql's uuid_generate_v1() conflict when we change the computer date/time?

According to postgresql uuid-ossp documentation uuid_generate_v1() is based on Mac address + timestamp: https://www.postgresql.org/docs/9.4/static/uuid-ossp.html On a distributed database scenario ...
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1answer
395 views

Position of a race result using database query?

The scenario is based around a race event (running/jogging) Is there a way of getting a position of a person by using their race results. For example the quickest person to finish a race would be in ...
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2answers
159 views

Refining Productivity & Efficiency Query

I'm trying to write a query that is, in effect, a Productivity and Efficiency Report for measuring the statistics of those of us (such as myself) who type up the paper work orders that our mechanics ...
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2answers
3k views

Compare an hour between two hour columns

Please help. I am kinda new to this database world. I am using PostgreSQL. I have a table with defined shifts like this: CREATE TEMPORARY TABLE shifts AS SELECT id, start_hour::time, end_hour::time ...
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2answers
633 views

SQL to choose a price between two points in time

Given a time-series of datetime price changes and another disparate time-series of N events, how do I query the last known price at the time of each event without running N queries? Essentially, I ...
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4answers
9k views

How do I generate a time series in PostgreSQL?

If you're looking to generate a date series, see this question Let's say I want to generate a series for every 5 minutes for 24 hours. How do I do that in PostgreSQL? PostgreSQL can generate_series()...
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1answer
31 views

How to create a CSV file which imports data from an Access Database on a Weekly Schedule?

I have very little experience in database management but have come across a problem I am unable to find a solution to online. I currently have access to a database which is updated in real time with ...
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2answers
3k views

PostgreSQL interval division

This has come up a couple of times, e.g., in the postgresql newsgroup and the wiki. In general, the relationship between different intervals may not be well defined - a month can be different numbers ...
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2answers
3k views

Clock change on SQL Server

With the clock change ahead in Europe - how does SQL Server deal with the clock change? Are there known issues related to a clock change?
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1answer
508 views

How to reduce redundant time-series data in MySQL into a function?

i have a question that actually does not fit here very much, but maybe it fits. So, i have data like this: How can i reduce this 3 entries with same values? Sure, i can just delete the other 2, but ...
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1answer
857 views

Does PostgreSQL Explain Analyze Execution Time consider Fetching time

I have some tests on GitHub which record how much time it takes to execute a query and fetch all results. If I check the execution plan, I get: Index Scan using post_comment_pkey on post_comment ...
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4answers
2k views

Update an entry in table when time expires

I need to modify an entry in table, based on time. i.e. table contains customer-info & subscription-info. I need to modify/delete subscription when subscription expires for each user. There can ...
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1answer
46 views

Can I get an equivalent query for this Not in Query

SELECT ID FROM dbo.SomeTable WHERE ID not in ( SELECT MIN(ID) FROM dbo.SomeTable GROUP BY SystemNo ) As this query ...
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0answers
272 views

Is there a faster way of importing 8m+ rows?

I'm creating a new feature on my website in order to provide player locations (my website is for a multiplayer gaming service), and am going to use a simple IP lookup in my database. For this I need ...
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1answer
3k views

Querying a date range

i query this SQL query: SELECT * FROM [DB].[dbo].[Table] WHERE [DATE] BETWEEN '01-01-2016' AND '31-03-2016' AND ([TIME] >= '00:00:00' OR [DATE] > '01-01-2016') AND ([TIME] <= '00:00:00' OR [...
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0answers
122 views

Time series data and utc conversion

I'm storing data in minute, hour, day, month and year buckets. All data is stored in UTC. Let's assume a client is in PDT time (-07:00 UTC) If the client wants to query for the hour sum of 4/23/2016 ...
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1answer
4k views

MS Access Data Type for time in hh:mm:ss format

My database contains three different sporting events with finishing times imported from an Excel spreadsheet in the hh:mm:ss format. How do I customize the Access data type field to accept this ...
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1answer
135 views

Grouping data by year based on two timestamp columns

My data table has the following columns: id INTEGER, name TEXT, created TIMESTAMP, deleted TIMESTAMP I want to product a report of the count of each name (which can appear several times in the table)...
2
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1answer
2k views

Constraint to prevent overlapping Time periods

I have a pretty simple table that stores a StartTime and an EndTime, both with the data type of Time(0). I need to enforce a constraint that prevents any overlapping. 'Touching' time periods are OK, ...
2
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1answer
422 views

Calculate hours based on a course schedule in mysql

I am trying to calculate user's attendance hours based on a course schedule. The user enters a room and I'm tracking in & out time. So I have the following tables user_id | room_id | ...