![]() If you want to get the current year, just type this: I’ll give you two examples to make this clear! year, month, day, hour, etc.)Īnd this function gets the current date and time… Important syntax requirement: this has to go between parentheses ()! The has to be replaced with the part of the date/time you need from your timestamp. (At least, in our specific case - when we work with the current date/time.) It’s an SQL function within an SQL function. In some data science projects, you’ll need only a specific part of your datetime value… Do you need the months only? The days? The seconds? Not a problem. Extracting year, month, day, hour, minute or second values from an SQL timestamp (using the date_part function) But be aware that there are a few exceptions - for instance, SELECT current_time::timestamp won’t work and will return an error instead. SELECT current_date::timestamp works perfectly, and it returns something like: 00:00:00. Note 2: most SQL date/time data types can be easily converted into other specific date/time data types. Note 1: Do you have any alternative solution to get the results above?Įxactly - using this query: SELECT current_date AS my_date, current_time AS my_time would result in the exact same output. See? We extracted the current date and the current time separately from the current_timestamp SQL function… Put it together and rename the columns: SELECT In our specific example, it would look like this: In data projects you’ll convert date/time data types quite often… And by far the most common “date-time-conversion” is to extract the date or the time values from a timestamp value.ĭata type conversions in general can be done by using the double colon notation ( ::). You can’t mix them in a column, for instance… and more importantly, if you use them smartly, you can convert one into another, so it fits your needs better. You always have to know exactly which one you’re using in your SQL tables and queries. The data types that we have used so far in this article: In SQL, there are a few different data types to work with date and time values. If you run the SQL current_timestamp function, you can “extract” the date and time figures from it.īefore that, here’s an SQL concept that you have to know of. Nice!īut it works the other way around, too. We have created a timestamp from current_date + current_time. Extracting date or time from an SQL timestamp Anyway, I’ll write a whole article about it later. I think it’s important that you see that you can do different operations with times and dates in SQL. But I showed you the SELECT current_date + current_time variation as well for a reason. Note: I prefer the SELECT current_timestamp solution. If you don’t want to bother with combining the two functions and renaming the column, you can go with the shorter built-in SQL function, which is: So let’s use the AS keyword and name our column… I’ll go with current_datetime for the column name, but feel free to choose whatever you fancy:Īnd here’s an alternative (maybe even better) solution. The first one is to combine SQL current_date and current_time:Īnd if you are like me, you will hate to see ?column? in the place of the column name. Hmm, you could have figured this out by yourself, too, right?īut let’s see what happens if you want to combine the two: when you need the current date and time in one cell. 15:43:01) in SQL, you’ll have to run this function: To get the current time in hours:minutes:seconds format (e.g. You might want to get the time - or the time and the date combined. ![]() ![]() Of course, sometimes the date itself is not enough. )) But there is more! (datetime, time, timestamp) If you run it, you’ll see that it does what it promises: I’ll start with the simplest and most commonly used current date function.įollowing from nomen est omen, the syntax is this: So it’s better if you know that this SQL tutorial is written for postgreSQL! That’s true - but the datetime functions are the exception in many cases. Important! As I always say, the different SQL languages (mySQL, postgreSQL, MSSQL, etc.) are pretty similar to each other. How to install SQL Workbench for postgreSQL.SQL for Data Analysis – Tutorial for Beginners – ep1.How to install Python, SQL, R and Bash (for non-devs).Note 2: If you are new here, start with these SQL articles first: Note: This is going to be a hands-on tutorial, so I encourage you to do the coding part with me. I won’t just show you the SQL current date function, but many alternatives, so you can pick the one that fits your needs the best. ![]() In this episode of my SQL tutorial series I’ll show you the best functions that return the actual time and date - or part of them. ![]() Working with current dates and times in data science projects is quite common. ![]()
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