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7.6 Integrating Conditional Logic with Date Functions

Snowflake’s SQL capabilities allow you to combine conditional expressions with date functions for more complex data manipulation. For example, you can determine the next renewal date based on the opportunity stage:

CASE

 WHEN "StageName" = 'Closed Won' THEN DATEADD('years', 1, "CloseDate")

 ELSE NULL

END AS "Next Renewal Date"

In this case, if the opportunity stage is “Closed Won”, the query calculates the renewal date as 12 months after the close date. If the stage is anything else, it leaves the renewal date as NULL, effectively using conditional logic to tailor your data analysis.

By mastering these date-handling functions in Snowflake, you can enhance your data analysis capabilities, making your reports more dynamic, accurate, and reflective of your operational realities. Whether you’re adjusting for time zones, calculating durations, or projecting future dates, Snowflake provides the tools necessary to navigate the complexities of date and time data efficiently.

7.5 LAST_DAY of Period

Calculating the last day of a period, such as a month or a year, is a frequent requirement in data analysis, especially when dealing with financial, sales, or performance data that is often summarized on a monthly or annual basis. The LAST_DAY function simplifies this task by returning the date of the last day of the period that contains the specified date.

The basic syntax for the LAST_DAY function in Snowflake SQL is:

LAST_DAY(<date_or_time_expr>, <optional_date_part>)

<date_or_time_expr> is the date or timestamp expression from which you want to find the last day of the period. [<optional_date_part>]: This optional argument allows you to specify the part of the date to consider for the calculation, such as MONTH or YEAR. If omitted, the default is typically MONTH.

For example, if we had a lead that was created mid-January, when we apply the LAST_DAY function for ‘month’ let’s explore the syntax and result:

LAST_DAY ("CreatedDate",'month',) “Month End Date”


RESULT EXAMPLE (assuming Created Date is ‘2024-01-25’)

2024-31-01

What if we wanted to calculate the last day of the year? If your SQL looks like the following, you are on the right track!

LAST_DAY ("CreatedDate",year,) “Year End Date”


RESULT EXAMPLE (assuming Created Date is ‘2024-01-25’)

2024-31-12