Скачать или смотреть How to Define a GEOGRAPHY Point Variable in Snowflake

Learn how to properly define a `GEOGRAPHY` point variable in Snowflake and use it effectively in SQL queries with step-by-step solutions and code examples.
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This video is based on the question https://stackoverflow.com/q/75486898/ asked by the user 'cs0815' ( https://stackoverflow.com/u/283538/ ) and on the answer https://stackoverflow.com/a/75486934/ provided by the user 'Lukasz Szozda' ( https://stackoverflow.com/u/5070879/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Geography Point Variables in Snowflake

When working with geographical data in Snowflake, developers often encounter the challenge of defining GEOGRAPHY point variables for use in SQL queries. A common question that arises is how to create and utilize these geographical points effectively. In this guide, we will address the problem of defining a GEOGRAPHY point variable and provide detailed solutions to overcome common hurdles.

The Problem

A user attempted to define a GEOGRAPHY point variable using the following code:

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

Despite multiple efforts, the code did not yield the desired outcome. The user also encountered another issue when trying to select the distance from a polygon:

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The error thrown was: "Bind variable :point not set." This indicates that Snowflake could not recognize the defined point variable when executing the SQL query.

The Solution

To resolve these issues, we will explore the right way to declare and use GEOGRAPHY point variables within the Snowflake scripting block. Here’s a step-by-step breakdown of how to accomplish this:

Step 1: Define the Geography Point

Using a Snowflake scripting block enables you to define a GEOGRAPHY point variable properly. Here’s the correct way to do it:

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This block correctly initializes the variable point with the geographical coordinates.

Expected Output

When executed, this script returns an output in JSON format:

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

Step 2: Create and Populate a Table for Queries

Next, you will want to create a table to store geographical data, allowing you to use the point variable in a query. Here’s how you can do that:

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

In this case, we create a table called some_table that contains a polygon point.

Step 3: Execute SQL with the Point Variable

Now, let’s utilize the point variable in a SQL query to calculate the distance from the geographical point to the polygon defined in the some_table.

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Expected Output of the Query

Upon execution, you will receive a result set showing the distance:

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

Conclusion

Defining and using a GEOGRAPHY point variable in Snowflake can be straightforward once you understand the syntax and structure needed for proper implementation. By following the steps outlined in this post, you can confidently integrate geographical data handling into your Snowflake queries.

Feel free to reach out in the comments if you have any questions or need further clarification on anything discussed! Happy querying!