Results for “empty”
Small, practical examples. Search by task or narrow things down below.
Forward all arguments without changing their boundaries
Bash Scripts: Quoted at-sign preserves empty arguments and embedded spaces.
Bash Scripts✓ Tested
Generate a bounded sequence recursively
Use a recursive CTE with a recursion limit.
recursive CTE✓ Tested
Generate a sequence of numbers
Create rows without a stored table.
generate_series✓ Tested
Generate every combination of two sets
SQL Server: CROSS JOIN creates one result per possible pair, so the output size is the product of the input sizes.
SQL Server✓ Tested
Generate every combination of two sets
Postgres: CROSS JOIN creates one result per possible pair, so the output size is the product of the input sizes.
Postgres✓ Tested
Get the latest row in each group
Select one ordered row per key with DISTINCT ON.
DISTINCT ON✓ Tested
Give a function an optional argument
Let callers omit a value while keeping nounset enabled.
optional argument✓ Tested
Give a function its own positional parameters
Bash Scripts: A function receives its call arguments without replacing the caller’s positional parameters.
Bash Scripts✓ Tested
Give a result column a readable name
SQL Server: Use AS to label a computed result column.
SQL Server✓ Tested
Give a result column a readable name
Postgres: Use AS to label a computed result column.
Postgres✓ Tested
Group by more than one field
SQL Server: Each distinct combination of grouping fields produces its own row.
SQL Server✓ Tested
Group by more than one field
Postgres: Each distinct combination of grouping fields produces its own row.
Postgres✓ Tested