Understanding SQL Server Datepart: A Comprehensive Guide for Dev

Greetings Dev! Are you looking for a detailed guide to understand SQL Server Datepart and effectively use it for your projects? Look no further, as this comprehensive article will provide you with everything you need to know about SQL Server Datepart. We will cover the basics, advanced concepts, and provide detailed examples to help you grasp the topic. Let’s dive in!

What is SQL Server Datepart?

SQL Server Datepart is a built-in function that extracts the specific part of a date and time value from a given date. It is an essential function used in various SQL queries and commands to perform date and time calculations, formatting, and conversion.

The Datepart function takes two arguments – the first is the date part (year, month, day, hour, minute, or second), and the second is the date or time value from which the date part needs to be extracted.

SQL Server Datepart Syntax

The syntax for SQL Server Datepart is as follows:

Function	Syntax
Datepart	Datepart(datepart, date)

Here, the first argument is the datepart (year, month, day, hour, minute, or second), and the second argument is the date or time value from which the date part needs to be extracted.

Using SQL Server Datepart Function

SQL Server Datepart function is primarily used in various SQL queries and commands to perform date and time calculations, formatting, and conversion. Here are some examples of how SQL Server Datepart function can be used:

Example 1: Extracting Year from a Date

To extract the year from a date, we can use the Datepart function with the ‘year’ argument. Here’s an example:

SELECT DATEPART(year, ‘2022-08-08’)

This query will return the year 2022 from the given date.

Example 2: Extracting Month from a Date

To extract the month from a date, we can use the Datepart function with the ‘month’ argument. Here’s an example:

SELECT DATEPART(month, ‘2022-08-08’)

This query will return the month 8 from the given date.

Example 3: Extracting Day from a Date

To extract the day from a date, we can use the Datepart function with the ‘day’ argument. Here’s an example:

SELECT DATEPART(day, ‘2022-08-08’)

This query will return the day 8 from the given date.

Example 4: Extracting Hour from a Time Value

To extract the hour from a time value, we can use the Datepart function with the ‘hour’ argument. Here’s an example:

SELECT DATEPART(hour, ’16:30:45′)

This query will return the hour 16 from the given time value.

Example 5: Extracting Minute from a Time Value

To extract the minute from a time value, we can use the Datepart function with the ‘minute’ argument. Here’s an example:

SELECT DATEPART(minute, ’16:30:45′)

This query will return the minute 30 from the given time value.

Example 6: Extracting Second from a Time Value

To extract the second from a time value, we can use the Datepart function with the ‘second’ argument. Here’s an example:

SELECT DATEPART(second, ’16:30:45′)

This query will return the second 45 from the given time value.

Advanced Concepts of SQL Server Datepart

Now that we have covered the basics of SQL Server Datepart, let’s move on to some advanced concepts.

Formatting Date and Time Values

SQL Server provides various formatting options that allow us to format date and time values as per our requirements. We can use the CONVERT function along with the Datepart function to format date and time values. Here is an example:

SELECT CONVERT(varchar, GETDATE(), 100) AS Date_Format;

This query will return the current date and time value in the format ‘Mon dd yyyy hh:miAM/PM’, as shown below:

Date_Format

Aug 18 2022 01:03AM

Calculating Age using SQL Server Datepart

SQL Server Datepart function can be used to calculate age from a given date of birth value. Here is an example:

SELECT DATEDIFF(year, ‘1995-08-08’, GETDATE()) AS Age;

This query will return the age of a person with a date of birth ‘1995-08-08’. The output will be as follows:

Age

27

FAQs about SQL Server Datepart

Q1. What is the purpose of SQL Server Datepart function?

A. The SQL Server Datepart function is used to extract a specific part of a date and time value from a given date. It is an essential function used in various SQL queries and commands to perform date and time calculations, formatting, and conversion.

Q2. How many arguments does the SQL Server Datepart function take?

A. The SQL Server Datepart function takes two arguments – the first is the date part (year, month, day, hour, minute, or second), and the second is the date or time value from which the date part needs to be extracted.

Q3. Can SQL Server Datepart function be used to calculate age?

A. Yes, the SQL Server Datepart function can be used to calculate age from a given date of birth value. We can use the DATEDIFF function along with the Datepart function to calculate age.

Q4. What are the various formatting options available with SQL Server Datepart function?

A. SQL Server provides various formatting options that allow us to format date and time values as per our requirements. We can use the CONVERT function along with the Datepart function to format date and time values. Some common formatting options are 100, 101, 102, 103, and so on.

Q5. Can we use SQL Server Datepart function with time values?

A. Yes, we can use the SQL Server Datepart function with time values to extract the specific parts like hours, minutes, and seconds.

Conclusion

We hope this comprehensive guide has helped you understand SQL Server Datepart and its usage in various SQL queries and commands. We covered the basics and advanced concepts of SQL Server Datepart, along with detailed examples and FAQs. If you have any questions or suggestions, feel free to leave a comment below. Happy learning!