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

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Docker / ComposeDockerfile patterns

Combine a stable entrypoint with default arguments

Docker / Compose: CMD supplies default arguments to an exec-form ENTRYPOINT.

Docker / Compose✓ Tested
CSSType & reading flow

Control tab width in preformatted content

CSS: Tab-size defines the interval of tab stops in a preformatted block.

CSS✓ Tested
PowerShellHashtables & object records

Convert an object’s properties into a hashtable

PowerShell: Enumerate PSObject.Properties when the set of property names is known only at runtime.

PowerShell✓ Tested
Linux CommandsTransforming text

Convert tab stops to spaces

Linux Commands: Use expand with a fixed tab width when preparing plain-text alignment.

Linux Commands✓ Tested
PythonMappings & sets

Copy nested mutable data independently

Python: Use deepcopy when changes to nested lists must not affect the original object.

Python✓ Tested
SQLBulk changes & set operations

Copy selected rows into another table

SQL: INSERT SELECT performs a set-based copy with an explicit destination column list.

SQL✓ Tested
SQL ServerBulk changes & set operations

Copy selected rows into another table

SQL Server: INSERT SELECT performs a set-based copy with an explicit destination column list.

SQL Server✓ Tested
PostgresBulk changes & set operations

Copy selected rows into another table

Postgres: INSERT SELECT performs a set-based copy with an explicit destination column list.

Postgres✓ Tested
SQLiteBulk changes & set operations

Copy selected rows into another table

SQLite: INSERT SELECT performs a set-based copy with an explicit destination column list.

SQLite✓ Tested
SQLGetting Started

Count the rows in a table

SQL: COUNT(*) includes every row, including rows with NULL columns.

SQL✓ Tested
SQL ServerGetting Started

Count the rows in a table

SQL Server: COUNT(*) includes every row, including rows with NULL columns.

SQL Server✓ Tested
PostgresGetting Started

Count the rows in a table

Postgres: COUNT(*) includes every row, including rows with NULL columns.

Postgres✓ Tested