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

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Docker / ComposeDockerfile patterns

Keep exec-form arguments literal

Docker / Compose: JSON exec form does not expand shell environment variables.

Docker / Compose✓ Tested
CStructures & function interfaces

Keep function state between calls

C: A static local variable retains its stored value for the lifetime of the process.

C✓ Tested
PythonMappings & sets

Keep only the most recent items

Python: Use a bounded deque to discard the oldest item as new values arrive.

Python✓ Tested
RustVectors & slices

Keep only values satisfying a condition

Keep only values satisfying a condition in a complete Rust program using the standard library.

Rust✓ Tested
SQLRelationships & missing data

Keep parent rows while filtering joined children

SQL: Put a child filter in ON when unmatched parents must remain in the result.

SQL✓ Tested
SQL ServerRelationships & missing data

Keep parent rows while filtering joined children

SQL Server: Put a child filter in ON when unmatched parents must remain in the result.

SQL Server✓ Tested
PostgresRelationships & missing data

Keep parent rows while filtering joined children

Postgres: Put a child filter in ON when unmatched parents must remain in the result.

Postgres✓ Tested
SQLiteRelationships & missing data

Keep parent rows while filtering joined children

SQLite: Put a child filter in ON when unmatched parents must remain in the result.

SQLite✓ Tested
SQLGetting Started

Keep rows matching a condition

SQL: Use WHERE to select rows with a particular category.

SQL✓ Tested
SQL ServerGetting Started

Keep rows matching a condition

SQL Server: Use WHERE to select rows with a particular category.

SQL Server✓ Tested
Linux CommandsGetting Started

Keep spaces inside one argument

Linux Commands: Keep spaces inside one argument using GNU/Linux commands in an empty practice directory.

Linux Commands✓ Tested
SQLJoins & subqueries

Keep unmatched rows with LEFT JOIN

Show every product even when stock is missing.

LEFT JOIN✓ Tested