Скачать или смотреть How to Retrieve Acc_Nos Within a 5-Day Date Range in SQL

Discover how to query SQL tables to find `Acc_No`s where the arrival date falls within 5 days of the on-board date.
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SQL Querying for Date Ranges: Finding Acc_No's within 5 Days

When working with databases, you often encounter the need to filter data based on specific conditions. One common scenario is when you have two date columns and you want to find records where these dates are within a certain range of each other. In this post, we’ll dive into how to construct a SQL query that allows you to fetch Acc_Nos whose arrival_date is plus or minus 5 days from their on_board_date.

Understanding the Table Structure

Before we jump into the query, let’s take a look at the table we are working with, which has the following columns:

Acc_No: Identification number for the account.

On_board_date: When an entity boarded, formatted as YYYY-MM-DD.

Arrival_date: When the entity arrived, also in YYYY-MM-DD.

Here’s a snippet of the table:

Acc_NoOn_board_dateArrival_date0012022-02-012022-02-040022022-03-102022-03-070032022-03-122022-03-25Our goal is to filter the records to obtain only those Acc_Nos where the arrival_date is +/- 5 days from the on_board_date.

The Challenge: Initial Attempt

Initially, a query was attempted using:

[[See Video to Reveal this Text or Code Snippet]]

Unfortunately, this query did not yield the desired results. The conditions set in the WHERE clause did not effectively capture the records within the 5-day range around the on_board_date.

The Solution: The Right SQL Query

After some exploration and suggestions, a more effective query was identified:

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Solution

DATEDIFF Function: This function calculates the difference in days between the two date columns.

BETWEEN Clause: This clause filters the results to show only records where the date difference is between -5 and 5 days.

This means:

A positive result indicates that the arrival_date occurs after the on_board_date, which is acceptable as long as it’s within 5 days.

A negative result signifies that the arrival_date is earlier than the on_board_date, also acceptable within that same 5 days.

Query Result

Using the effective solution above with the provided data will yield the following filtered results:

Acc_NoOn_board_dateArrival_date0012022-02-012022-02-040022022-03-102022-03-07Conclusion

Finding records within a specific date range in SQL is straightforward once you understand how to utilize functions like DATEDIFF. This method not only simplifies the querying process but also ensures accuracy in the results retrieved from your database.

Next time you encounter a similar date-related challenge, remember to leverage the DATEDIFF function along with the BETWEEN clause to streamline your queries effectively!