Great Amazon Redshift Date Functions To Know

Below the video are great date functions on Amazon Redshift. However, you can first witness a two-minute video that joins a Redshift table with tables from Databricks, Snowflake, Yellowbrick, Vertica, Azure Synapse, BigQuery, Teradata, Oracle, SQL Server, DB2, MySQL, Postgres, Microsoft Access, and Excel in a single federated query.

You can now download our books on Synapse, Redshift, Google BigQuery, DB2, Oracle, Yellowbrick, Vertica, MySQL, Postgres, and more for FREE.

You can download the PDFs from our CoffingDW.com website immediately.

Here is how you do it. Go to CoffingDW.com and click on Books from the top right menu. You will then be in the CoffingDW bookstore, where you will see the Snowflake book. Add the Snowflake book to your cart.

Add any book you want to your cart.

When you check out, you use the coupon FRIEND2023.

You won’t have to enter any credit card information. Just put in your name and email, and the price will be discounted to zero. You can then download the book immediately at no cost to you.

The current_date will return today’s date. Add or subtract a number from the CURRENT_DATE, and you are adding or subtracting days from the date. For example, subtracting from two dates, you get the number of days between the two dates.

Below are the keywords you can utilize to get the date or timestamp. These are reserved words that the system will deliver to you when requested.

Adding or subtracting a number from a date adds or subtracting several days from the date. Notice that the second column uses “Due Date” as an alias, but Redshift uses the alias again in the SELECT statement for column four to come up with the discount.

The Add_Months command adds months to a date. Below, we are using a great technique that adds one year. We then show an even better technique to add five years to date. Of course, we could have gotten five years by using 60 (months), but why calculate in your mind when the system will do it for you?

The DATEADD and ADD_MONTHS functions are similar, but they handle the end of the month differently.

You can use the TO_CHAR function to format dates.

The below example shows how robust the EXTRACT command is at extracting portions of a date, time, or timestamp.

You can use the to_char extension to extract portions of a date.

The DATEDIFF command takes a datepart and returns the difference between two dates or timestamps.

MONTHS_BETWEEN returns the number of months between two DATE or TIMESTAMP values.

NEXT_DAY returns the date of the first specified day of the week (DOW) after the input date.