How to create a javascript UDF in Snowflake

This recipe helps you create a javascript UDF in Snowflake

Recipe Objective: How to create a javascript UDF in Snowflake?

Snowflake is one of the few enterprise-ready cloud data warehouses that brings simplicity without sacrificing features. It automatically scales, both up and down, to get the right balance of performance vs. cost. Snowflake's claim to fame is that it separates computers from storage. This is significant because almost every other database, Redshift included, combines the two, meaning you must size for your largest workload and incur the cost that comes with it. In this scenario, we will learn how to create a javascript UDF  that specifies the code is in the JavaScript language.

Data Ingestion with SQL using Google Cloud Dataflow

System requirements:

Step 1: Log in to the account

We need to log in to the snowflake account. Go to snowflake.com and then log in by providing your credentials. Follow the steps provided in the link above.

Step 2: Create a Database in Snowflake

We can create it in two ways:  using the CREATE DATABASE statement.

Note: that you do not need to create a schema in the database because each database created in Snowflake contains a default public schema.

Syntax of the statement:

create or replace database [database-name] ;

Example of the statement:

create or replace database dezyre_test ;

The output of the above statement: As you can see, the above statement is successfully run in the below image

bigdata_1.jpg

Step 3: Select Database

To select the database which you created earlier, we will use the "use" statement

Syntax of the statement:

Use database [database-name];

Example of the statement:

use database dezyre_test;

Step 4: Creating SQL UDF function

Here we are going to know how we create a user-defined function. For example, we will create a user-defined function that takes two values as input and returns the output in this scenario.

Syntax of the javascript function:

CREATE [ OR REPLACE ] [ SECURE ] FUNCTION ( [ ] [ , ... ] ) RETURNS { | TABLE ( [ , ... ] ) } [ [ NOT ] NULL ] LANGUAGE JAVASCRIPT [ { CALLED ON NULL INPUT | { RETURNS NULL ON NULL INPUT | STRICT } } ] [ VOLATILE | IMMUTABLE ] [ COMMENT = '' ] AS ''

Example of the javascript function:

create function js_check_bignumber(M float, N float) returns float language javascript as if(M>N)returnMelsereturnN if (M>N) {return M } else { return N} ;

The output of the above statement:

bigdata_2.jpg

Using the above function run an example by providing the two values to get the output.

select js_check_bignumber(100,10);

The output of the function returns:

bigdata_3.jpg

Conclusion

Here we learned to create a javascript UDF in Snowflake.

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Ed Godalle

Director Data Analytics at EY / EY Tech
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I am the Director of Data Analytics with over 10+ years of IT experience. I have a background in SQL, Python, and Big Data working with Accenture, IBM, and Infosys. I am looking to enhance my skills... Read More

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