Snowflake

How to use Conditional Insert into Snowflake Tables?

Snowflake cloud data warehouse supports many useful features that are not yet available in many other similar databases. One of such features is multi-table INSERT. You can insert one or more rows from query into one or more table. Syntax support both conditional and unconditional inserts. This feature is useful when you are inserting data using some conditions such as insert only positive rows to the particular table. In this article, we will check how to use conditional and unconditional insert into Snowflake tables, its syntax and examples. Conditional and…

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July 28, 2021
Snowflake

How to Drop All SQL Variables in Snowflake Session?

Snowflake supports SQL session variable declaration by the user. SQL variable serves many purposes such as storing application specific environmental variables. You can also use SQL variables to create parameterized views or parameterized query. Once the variables are defined, you can explicitly use UNSET command to reset the SQL variables. In this article, we will check how to drop or reset all SQL variables in Snowflake session. Snowflake SQL Variables Before going into methods to reset all SQL variables, let us check how to define a SQL variable and reset…

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July 27, 2021
Snowflake

Snowflake LIMIT and OFFSET – Uses and Examples

You can use the LIMIT clause in Snowflake to limit the number of results that are returned by the SQL statement or subquery. The LIMIT clause allows you to test your SQL queries with the limited number of rows instead of executing it on the entire data set. In this article, we will check Snowflake LIMIT and OFFSET, syntax, uses and some examples. Snowflake LIMIT and OFFSET The LIMIT clause constrains the maximum number of rows returned by a statement or subquery. It is a PostgreSQL syntax to limit the…

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July 26, 2021
Snowflake

How to Query S3 External Files in Snowflake?

You can integrate the cloud storages, such as AWS S3, Azure Blob and GCP cloud storage with Snowflake cloud data warehouse very easily. Snowflake does support external tables, you can create external tables on the top of the files stored on the external storages such as S3, blob or GCP storage. In this article, we will check how to query S3 external files directly in Snowflake. How to Query S3 External Files in Snowflake? Snowflake Cloud data warehouse supports using standard SQL to query data files located in an internal…

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July 26, 2021
Snowflake

Snowflake Error handling – Procedure and Functions

Snowflake Cloud data warehouse supports stored procedures to support migration from other relational databases. Snowflake allows you to write stored procedure using JavaScript APIs. It also supports error handling using try/catch block. However, it also supports built-in functions such as try_cast to handle error during type conversion. In this article, we will check methods for handling error in Snowflake procedures and functions. Snowflake Error handling The Snowflake allows you to handle errors with the help of try/catch block when you write a procedure or function using the JavaScript API. Snowflake…

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July 23, 2021
Snowflake

How to Write Parameterized Queries in Snowflake?

Snowflake supports almost all features that are available in legacy relational databases such as Oracle, Teradata, etc. Along with those features, Snowflake provides many extensions that will allow you to write efficient queries. One of such features is ability to SET and pass variables to the query, In my other articles, we have discussed how to create parameterized views in Snowflake. In this article, we will check how to write parameterized queries in Snowflake with the help of the SET command. Why Do We Need Queries with Parameters in Snowflake?…

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July 20, 2021
Snowflake

How to Get Row Count of Database Tables in Snowflake?

Counting the number of records from the database tables is one of the mandatory checks when you migrate data from one server to another. Snowflake is very rich in metadata information. It captures many useful information such as details about tables, columns, views, etc. In this article, we will write few useful queries to get row count of Snowflake database tables. Get Row Count of Database Tables in Snowflake You can look for object metadata information either in INFROMATION_SCHEMA for a particular database or utilize the ACCOUNT_USAGE that Snowflake provides…

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July 16, 2021
Snowflake

How to Handle Duplicate Records in Snowflake Insert?

Snowflake does not enforce constraints on tables. Handling duplicate records in Snowflake insert is one of the common requirements while performing a data load. Snowflake supports many methods to identify and remove duplicate records from the table. In this article, we will check how to handle duplicate records in the Snowflake insert statement. It is basically one of the alternative methods to enforce the primary key constraints on Snowflake table. Handle Duplicate Records in Snowflake Insert Snowflake allows you to identify a column as a primary key, but it doesn't…

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July 14, 2021
Snowflake

Snowflake Nested Window Functions and Examples

Snowflake supports many useful windows or analytical functions. Many reporting queries use the analytic functions such as cumulative sum and average. But, whenever you try to call an analytics function within another analytics function, you will end up with an error such as "may not be nested inside another window function.". In this article, we will check how to use the nested window functions in Snowflake with an alternate example. Snowflake does not allow you to define the nested window function. You will have to use alternative methods such as…

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July 8, 2021
Snowflake

How to Print SQL Query in Snowflake Stored Procedure?

As explained in my other article, to support migration from other relational databases, Snowflake supports the stored procedures. Snowflake uses JavaScript as a procedural language. It provides many features including control structures - branching, looping, Dynamic SQL, error handling, etc. But, JavaScript API, does not provide any print statement support to display the content of variable or SQL query itself. In this article, we will check how to print SQL query in Snowflake stored procedure. Print SQL Query in Snowflake Stored Procedure Snowflake stored procedure support many useful JavaScript API's.…

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June 22, 2021