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SQL Snippets.

Perform Conditional Aggregation Using CASE Statements

Discover how to aggregate data based on specific conditions within a single query using SQL's CASE statement for flexible and efficient reporting.

Calculate Running Totals (Cumulative Sum) in SQL

Understand how to compute cumulative sums or running totals over a set of rows in SQL, essential for financial analysis, sales trends, and inventory tracking.

Delete Records Based on Conditions from Another Table

Learn to safely delete rows from one table where related records in another table meet specific criteria using SQL subqueries.

Extract and Query JSON Data from a Column

Explore SQL functions to parse, extract, and filter data stored as JSON strings within a database column (e.g., PostgreSQL/MySQL specific functions).

Implementing Pagination with LIMIT and OFFSET

Learn how to efficiently retrieve a specific page of results from a large dataset using SQL's LIMIT and OFFSET clauses for pagination in web applications.

Retrieving Related Data with INNER JOIN

Understand how to combine rows from two or more tables based on a related column using the SQL INNER JOIN clause to retrieve comprehensive data.

Grouping Data and Filtering Groups with HAVING

Master SQL's GROUP BY clause to aggregate data and use HAVING to filter these aggregated results, for example, to find users with multiple orders.

Performing UPSERT Operations (ON CONFLICT / ON DUPLICATE KEY)

Learn how to perform an UPSERT (update or insert) operation in SQL, crucial for preventing duplicate records while ensuring data freshness in your database.

Identifying and Deleting Duplicate Records While Retaining One

Discover how to find and remove duplicate rows from a table, keeping only one unique instance of each record to maintain data integrity and consistency.

Identify Duplicate Rows Based on Specific Columns

Discover and list all duplicate entries in a SQL table by checking for identical values across one or more specified columns for data integrity.

Retrieve Records Within a Specific Date Range

Effortlessly fetch database records that fall within a defined start and end date, perfect for reports, analytics, or time-based filtering.

Perform Case-Insensitive Keyword Search

Implement a basic case-insensitive keyword search in your SQL database using the LOWER function with LIKE (SQL Standard) or ILIKE (PostgreSQL).