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

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SQL ServerSchema design & transactions

Enforce a relationship between two columns

SQL Server: A row-level CHECK can require a start value to be no greater than an end value.

SQL Server✓ Tested
PostgresSchema design & transactions

Enforce a relationship between two columns

Postgres: A row-level CHECK can require a start value to be no greater than an end value.

Postgres✓ Tested
SQLiteSchema design & transactions

Enforce a relationship between two columns

SQLite: A row-level CHECK can require a start value to be no greater than an end value.

SQLite✓ Tested
PowerShellHashtables & object records

Find differences between two collections

PowerShell: Compare-Object marks reference-only values with a left arrow and difference-only values with a right arrow.

PowerShell✓ Tested
Linux CommandsSorting & joining records

Find lines common to two sorted files

Linux Commands: Use comm -12 to suppress the two columns of unmatched lines.

Linux Commands✓ Tested
SQLRelationships & missing data

Find parents with at least two child rows

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

SQL✓ Tested
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
SQLBulk changes & set operations

Find rows shared by two query results

SQL: INTERSECT compares complete selected rows and removes duplicates.

SQL✓ Tested
SQL ServerBulk changes & set operations

Find rows shared by two query results

SQL Server: INTERSECT compares complete selected rows and removes duplicates.

SQL Server✓ Tested
PostgresBulk changes & set operations

Find rows shared by two query results

Postgres: INTERSECT compares complete selected rows and removes duplicates.

Postgres✓ Tested