In DuckDB, the strftime() function is a handy tool for formatting date and timestamp values as strings. It accepts the date/timestamp value and a format string as arguments. The function then returns the date/time in the format provided by the format string.
Author: Ian
7 Functions that Return the Current Date in DuckDB
DuckDB provides us with a bunch of functions that we can use to return the current date and/or time. We can get the date in local time or coordinated universal time (UTC), depending on the function we use. These can be useful in a range of scenarios, such logging the current date in a database column, or filtering or comparing dates based on the current date.
Continue readingUnderstanding the STRPTIME() Function in DuckDB
DuckDB provides us with a good selection of date/time functions. The strptime() function is a useful one for times where you need to convert a date string into a valid timestamp value; its sole purpose is to parse strings into timestamps.
In this article, we’ll look at how the strptime() function works, along with some examples to demonstrate.
Fix “Error: Month out of range, expected a value between 1 and 12” when using strptime() in DuckDB
If you’re getting an error that reads “Error: Month out of range, expected a value between 1 and 12” when using the strptime() function in DuckDB, it could be that you’re getting your months mixed up in your format string.
A Quick Look at the SUM() Function in DuckDB
One of the more commonly used aggregate functions in SQL databases is the sum() function, which provides an easy way to calculate the total sum of a numeric column. DuckDB is no exception.
In this article, we’ll explore how the sum() function works in DuckDB, along with some straightforward examples to demonstrate.
How to Check a Table for Unique Indexes in SQLite
Being able to ensure uniqueness in database tables is critical for maintaining data integrity. SQLite allows us to create unique indexes in order to enforce uniqueness, and it provides us with tools to check the unique indexes associated with a table.
This article outlines how to use the SQLite PRAGMA index_list() command to check a table for unique indexes.
7 Functions that Extract the Day from a Date in DuckDB
When working with dates in DuckDB, extracting specific components like the day is a common task. DuckDB provides a good range of functions that we can use to help us to perform such a task.
This article presents seven different functions we can use to extract the day from a date in DuckDB.
Continue readingHow to Format Dates in DuckDB
When working with SQL databases such as DuckDB, dates usually conform to a specific format. In particular, when we create dates in DuckDB, they must conform to the ISO 8601 format (YYYY-MM-DD). It’s the same with time (hh:mm:ss[.zzzzzz][+-TT[:tt]]) and timestamp values (YYYY-MM-DD hh:mm:ss[.zzzzzzzzz][+-TT[:tt]]).
But what if we have a requirement to present these dates or timestamps in a different format?
Fortunately, DuckDB provides us with tools to so. This article explains how to format date and timestamp values according to a specified format.
Continue readingSubtracting One or More Years from a Date in DuckDB
Sometimes we need to subtract a certain time interval from a date when working with DuckDB. We might want to subtract hours, minutes, days, months, or even years.
Below are two methods we can use to subtract one or more years from a date in DuckDB.
Continue readingA Quick Look at the LIST() Function in DuckDB
DuckDB, an in-memory analytical SQL database management system, provides a good selection of functions for data manipulation and analysis. One of the these functions is list().
The list() function enables users to group multiple values into a single list, allowing for more advanced data aggregation and operations.
In this article, we’ll explore how the list() function works, along with some simple examples.