Results for “Containers & compound values”
Small, practical examples. Search by task or narrow things down below.
Join text rows in a chosen order
Combine values using string_agg.
string_agg✓ Tested
Keep exec-form arguments literal
Docker / Compose: JSON exec form does not expand shell environment variables.
Docker / Compose✓ Tested
Keep only the most recent items
Python: Use a bounded deque to discard the oldest item as new values arrive.
Python✓ Tested
Keep scratch data only for the container lifetime
Docker / Compose: Separate tmpfs mounts do not share data between container runs.
Docker / Compose✓ Tested
Label a volume with its purpose
Docker / Compose: Volume labels support explicit ownership and selection.
Docker / Compose✓ Tested
Limit the number of container processes
Docker / Compose: The pids-limit setting caps the container’s process count.
Docker / Compose✓ Tested
List a specific image reference
Docker / Compose: The reference filter narrows repository and tag results.
Docker / Compose✓ Tested
List only volumes matching a label
Docker / Compose: A label filter avoids relying on broad name patterns.
Docker / Compose✓ Tested
Load environment variables from a file
Docker / Compose: An env file supplies one KEY=value assignment per line.
Docker / Compose✓ Tested
Make a Compose service’s filesystem read-only
Docker / Compose: Make a Compose service’s filesystem read-only in a small Compose file.
Docker / Compose✓ Tested
Make a pair of columns unique together
SQL: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL✓ Tested
Make a pair of columns unique together
SQL Server: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL Server✓ Tested