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

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PostgresConstraints & defaults

Keep children while clearing a deleted relationship

Postgres: ON DELETE SET NULL requires a nullable foreign-key column.

Postgres✓ Tested
SQLiteConstraints & defaults

Keep children while clearing a deleted relationship

SQLite: ON DELETE SET NULL requires a nullable foreign-key column.

SQLite✓ Tested
ReactGetting Started

Keep component state with useState

Keep component state with useState with a small React component and explicit browser behavior.

React✓ 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
PowerShellFunctions & parameter validation

Keep function-local assignments separate from caller state

PowerShell: Ordinary function assignments create local variables rather than replacing the caller’s variable.

PowerShell✓ Tested
Bash ScriptsProcesses & environment

Keep loop state by avoiding a pipeline subshell

Bash Scripts: Redirect input into a while loop so updates to a counter remain in the current shell.

Bash Scripts✓ Tested
ReactAsync work & status

Keep only the latest requested result

Keep only the latest requested result with a small React component and explicit browser behavior.

React✓ 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
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
PostgresGetting Started

Keep rows matching a condition

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

Postgres✓ Tested
SQLiteGetting Started

Keep rows matching a condition

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

SQLite✓ Tested