Snowflake

How to Update JSON field in Snowflake Variant Column?

The update is a common operation in any relational databases. A Snowflake, a leading cloud data warehouse supports some unique features such as built-in support for semi structured data. Snowflake support many built-in functions that allow you yo manipulate semi-structured data, such as JSON and XML data. Its universal data type VARIANT allows you to store semi-structured data including parquet. In this article, we will check how to update JSON field in Snowflake. Update or Replace JSON field in Snowflake Snowflake support functionalities that are present in almost all relational…

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June 15, 2021
Snowflake

How Snowflake Internally Handles Updates? – Explanation

When you load data into Snowflake, Snowflake reorganizes that data into micro partition and stores into its internal optimized, compressed, columnar format. Snowflake stores this optimized data in cloud storage. Snowflake uses S3, Blob storage or GCP cloud storage. However, all these storages are immutable. Obviously the question would be how Snowflake internally performs or handles updates when you execute the update command? How Snowflake Internally Handles Updates? Many people would have thought of this question when they were going through Snowflake architecture. It is a complex question. Snowflake uses…

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June 1, 2021
Azure Synapse

Azure Synapse Update Join Syntax – Update using other Table

In an ETL model, we use fact tables to store data. Initially, data is loaded into stage (intermediate) tables and then finally, cleansed data is loaded to target fact tables. New records are loaded and existing records are updated, You can use MERGE statement or update table using some other table. In this article, we will check Azure synapse update join syntax with an example. Azure Synapse Update Join Many ETL applications such as loading fact tables use an update join statement where you need to update a table using…

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July 21, 2020
Snowflake

Snowflake Update Join Syntax – Update using other Table

In the database, data is stored in the tables. Data is collected from various sources. Data is collected over the specific period of time and it may or may not be accurate at the time of loading. In some cases, you may want to update the table by taking data from other another table over same or other database on the same server. In this article, we will check Snowflake Update Join Syntax and example on how to update a table with data from another table. Snowflake Update Join Table…

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December 27, 2019
BigData

Hadoop Hive Transactional Table Update join and Example

As you know Apache Hive is a data warehouse framework on top of Hadoop HDFS. Since it contains tables, you may want to update records of that table based on how your data changes. Until recently Apache Hive was not supporting transactions. Starting Hive 0.14 and above supports transactional table. You need to enable ACID properties in order to use update, delete, merge in your Hive queries. In this article, we will address How to use update join on your Hive transactional table. You can also update Hive table without…

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November 2, 2019