sql engineering
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Databricks SQL: Query Historical Delta Table Versions
Databricks SQL Tutorial: Query Historical Delta Table Versions Databricks SQL Tutorial: Query Historical Delta Table Versions This tutorial demonstrates how to query historical versions of a Delta table using Databricks SQL. We will execute three scripts, each building upon the previous one, to progressively explore the capabilities of querying historical data. Script 1: Initial Version…
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Databricks SQL: Load Cloud Files Incrementally with COPY INTO
Databricks SQL Tutorial: Incremental Load with COPY INTO Databricks SQL Tutorial: Load Cloud Files Incrementally with COPY INTO This tutorial demonstrates how to load data from cloud files into a Databricks SQL table incrementally using the `COPY INTO` command. We’ll focus on the key aspects of this process and build three scripts to illustrate the…
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Databricks SQL: Publish Aggregated Gold Tables
Databricks SQL Tutorial: Publish Aggregated Gold Tables Databricks SQL Tutorial: Publish Aggregated Gold Tables This tutorial guides you through publishing aggregated “gold” tables in Databricks SQL. We will build this process incrementally, focusing on the core functionality. The goal is to understand how to efficiently publish pre-calculated data for downstream consumption. Script 1: Create and…
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Databricks SQL: Reconcile Source and Target Row Counts
Databricks SQL Tutorial: Reconcile Source and Target Row Counts Databricks SQL Tutorial: Reconcile Source and Target Row Counts This tutorial guides you through reconciling source and target row counts using Databricks SQL. We’ll focus on the core principles and techniques, providing practical examples with runnable SQL scripts. The primary goal is to verify the accuracy…
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Databricks SQL: Reduce Data Scans with Selective Predicates
Databricks SQL Tutorial: Reduce Data Scans with Selective Predicates Databricks SQL Tutorial: Reduce Data Scans with Selective Predicates This tutorial focuses on reducing data scans in Databricks SQL by strategically using selective predicates. We’ll explore how to filter data as early as possible in your queries to minimize the amount of data processed. Script 1:…
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Databricks SQL: Optimize Join Order and Join Conditions
Databricks SQL: Optimize Join Order and Join Conditions Databricks SQL: Optimize Join Order and Join Conditions This tutorial focuses on optimizing join performance in Databricks SQL. We’ll explore how the join order and join conditions impact query execution time. The core principle is to minimize the amount of data processed during the join operation. Script…
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Databricks SQL: Use Query Hints Deliberately
Databricks SQL Tutorial: Using Query Hints Deliberately Databricks SQL Tutorial: Using Query Hints Deliberately This tutorial will guide you through using query hints in Databricks SQL. Query hints are directives you can add to your SQL queries to influence the optimizer’s choices, potentially improving performance or ensuring specific execution strategies. This tutorial focuses on demonstrating…
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Databricks SQL: Improve Delta Layout with Liquid Clustering
Databricks SQL Tutorial: Improve Delta Layout with Liquid Clustering Databricks SQL Tutorial: Improve Delta Layout with Liquid Clustering This tutorial guides you through improving the layout of a Delta table using Liquid Clustering in Databricks SQL. We’ll use a practical scenario to demonstrate the steps, focusing solely on the core functionality. Script 1: Initial Setup…
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Databricks SQL: Compact Delta Files with OPTIMIZE
Databricks SQL: Compact Delta Files with OPTIMIZE Tutorial Databricks SQL: Compact Delta Files with OPTIMIZE Tutorial This tutorial focuses on using Compact Delta Files and the OPTIMIZE command within Databricks SQL. We’ll explore how to efficiently manage and optimize your data storage for query performance. Script 1: Initial Data and Compact Delta Files This script…
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Databricks SQL: Remove Expired Files Safely with VACUUM
Databricks SQL: Remove Expired Files Safely with VACUUM Databricks SQL: Remove Expired Files Safely with VACUUM This tutorial demonstrates how to safely remove expired files from a Databricks SQL table using the VACUUM command. We’ll build upon progressively complex scenarios to illustrate best practices. Script 1: Basic VACUUM Implementation This script sets up a simple…
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