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Small, practical examples. Search by task or narrow things down below.

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SQLSubqueries & ranked selection

Build a query from several named stages

SQL: Separate row selection from aggregation using two common table expressions.

SQL✓ Tested
SQL ServerSubqueries & ranked selection

Build a query from several named stages

SQL Server: Separate row selection from aggregation using two common table expressions.

SQL Server✓ Tested
PostgresSubqueries & ranked selection

Build a query from several named stages

Postgres: Separate row selection from aggregation using two common table expressions.

Postgres✓ Tested
SQLiteSubqueries & ranked selection

Build a query from several named stages

SQLite: Separate row selection from aggregation using two common table expressions.

SQLite✓ Tested
JavaScriptRegular expressions & URL encoding

Build a URL query string from values

JavaScript: URLSearchParams handles query escaping and repeated parameter appends.

JavaScript✓ Tested
Docker / ComposeGetting Started

Build an image with a default command

Docker / Compose: Build an image with a default command with a complete introductory Dockerfile.

Docker / Compose✓ Tested
JavaScriptObject behavior & collections

Build an object from key-value entries

JavaScript: Object.fromEntries converts an iterable of pairs into ordinary own properties.

JavaScript✓ Tested
Arduino / CBinary values & packets

Calculate a CRC-8 over a byte sequence

Arduino / C: This implementation uses polynomial 0x07, initial zero, and no reflection.

Arduino / C✓ Tested
SQLWindow analytics

Calculate a cumulative integer percentage

SQL: Divide a running window sum by the complete total using a unique ordering key.

SQL✓ Tested
SQL ServerWindow analytics

Calculate a cumulative integer percentage

SQL Server: Divide a running window sum by the complete total using a unique ordering key.

SQL Server✓ Tested
PostgresWindow analytics

Calculate a cumulative integer percentage

Postgres: Divide a running window sum by the complete total using a unique ordering key.

Postgres✓ Tested
SQLiteWindow analytics

Calculate a cumulative integer percentage

SQLite: Divide a running window sum by the complete total using a unique ordering key.

SQLite✓ Tested