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

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SQL ServerRelationships & missing data

Find parents with at least two child rows

SQL Server: Use a correlated count when testing a per-parent threshold.

SQL Server✓ Tested
PostgresRelationships & missing data

Find parents with at least two child rows

Postgres: Use a correlated count when testing a per-parent threshold.

Postgres✓ Tested
SQLiteRelationships & missing data

Find parents with at least two child rows

SQLite: Use a correlated count when testing a per-parent threshold.

SQLite✓ Tested
GitCommits & history

Find the commit responsible for a line

Inspect line attribution in a stable machine-readable format.

blame✓ Tested
SQLiteDates & time

Find the first day of a month

Round a date to its calendar month boundary.

date✓ Tested
RustIterators & transformations

Find the first matching value

Find the first matching value in a complete Rust program using the standard library.

Rust✓ Tested
PowerShellArray operations

Find the index of an array item

PowerShell: Array.IndexOf returns -1 when the requested item is absent.

PowerShell✓ Tested
jQueryTraversal & selection

Find the nearest matching ancestor

Read a parent row attribute using jQuery closest.

jQuery✓ Tested
PythonDates & time zones

Find the number of days in a month

Python: Use calendar.monthrange to account for leap years.

Python✓ Tested
PowerShellDates & numeric validation

Find the number of days in a month

PowerShell: DaysInMonth handles leap-year February correctly.

PowerShell✓ Tested
GoDates & times

Find the weekday for a date

Find the weekday for a date using a complete Go program with explicit sample inputs.

Go✓ Tested
PythonGetting Started

Find what remains after division

Python: Use the remainder operator to count items left after forming complete groups.

Python✓ Tested