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Asked: 2024-09-26T17:32:41+05:30 In:

how to get first day of year in sql

Subject: Need Help with SQL Query for First Day of Year

Hi everyone,

I hope you can help me out with a challenge I’m facing in SQL. I’m currently working on a project where I need to extract specific date information from our database, and I keep running into a roadblock. Specifically, I need to find the first day of the year for various date fields that I have in my dataset.

For example, if I have a date value like ‘2023-05-10’, I want to retrieve the corresponding first day of the year, which would be ‘2023-01-01’. I know that SQL has functions for date manipulation, but I’m having trouble figuring out the right approach to get this result across all the dates in my table.

Additionally, I need to ensure that this query performs efficiently, as the dataset is quite large. Should I use a specific SQL function or a combination of functions? Are there best practices or optimizations that I should be aware of? Any suggestions on how to tackle this issue would be greatly appreciated!

Thanks in advance for your assistance!

Best,
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    2 Answers


    1. To obtain the first day of the year in SQL, you can leverage the built-in date functions available in your SQL dialect. A common approach is to use the `DATEFROMPARTS` function available in SQL Server, which allows you to construct a date by specifying the year, month, and day. Here’s a succinct example: `SELECT DATEFROMPARTS(YEAR(GETDATE()), 1, 1) AS FirstDayOfYear;`. This query takes the current date obtained by `GETDATE()`, extracts the year using `YEAR()`, and then constructs the first day of that year by passing `1` for both the month and day parameters.

      In other SQL dialects, such as MySQL, you can utilize the `STR_TO_DATE` function in conjunction with the `YEAR` function to achieve this. An example query would look like this: `SELECT STR_TO_DATE(CONCAT(YEAR(CURDATE()), ‘-01-01’), ‘%Y-%m-%d’) AS FirstDayOfYear;`. This constructs a string that represents the first day of the current year and then converts it to a date format. Regardless of the SQL engine you’re using, these methods will efficiently yield the first day of the year as a date format that can be utilized for further querying or reporting.

    2. Okay, so if you’re trying to find the first day of the year in SQL, it’s pretty simple! Here’s a basic way to do it:

      SELECT DATEFROMPARTS(YEAR(GETDATE()), 1, 1) AS FirstDayOfYear;

      What this does is it gets the current date with GETDATE(), finds out what year it is with YEAR(), and then it pieces together a date using DATEFROMPARTS() that represents January 1st of that year!

      So if you run that, you should get something like 2023-01-01 if the current year is 2023. Neat, right?

      If you’re using a database that doesn’t have DATEFROMPARTS, you can do it like this:

      SELECT '1/1/' + CAST(YEAR(GETDATE()) AS VARCHAR(4)) AS FirstDayOfYear;

      This just creates a string that looks like ‘1/1/2023’ or whatever year it is! Hope this helps!

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