Results for “persistent data”
Small, practical examples. Search by task or narrow things down below.
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
Get the latest row in each group
Select one ordered row per key with DISTINCT ON.
DISTINCT ON✓ Tested
Give a result column a readable name
SQL: Use AS to label a computed result column.
SQL✓ Tested
Give a result column a readable name
SQL Server: Use AS to label a computed result column.
SQL Server✓ Tested
Group by more than one field
SQL: Each distinct combination of grouping fields produces its own row.
SQL✓ 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
Group by more than one field
SQLite: Each distinct combination of grouping fields produces its own row.
SQLite✓ Tested
Handle a result with a discriminated union
Separate success data from an error message.
discriminated union✓ Tested
Hash a UTF-8 value with SHA-256
C#: Use SHA256.HashData for a one-shot content digest.
C#✓ Tested
Identify headers for individual table rows
HTML: Scope row associates the first header cell with the data cells in that row.
HTML✓ Tested