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

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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
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
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
SQLJoins & subqueries

Keep unmatched rows with LEFT JOIN

Show every product even when stock is missing.

LEFT JOIN✓ Tested
HTMLData & disclosure

Label a data table

Use a caption and scoped headers for an HTML data table.

HTML✓ Tested
SQLExpressions & aggregates

Label rows with CASE

Derive a readable label from a condition.

CASE✓ Tested