Results for “empty”
Small, practical examples. Search by task or narrow things down below.
Join related rows from two tables
SQL Server: Match a category key to its display label with an explicit join condition.
SQL Server✓ Tested
Join related rows from two tables
Postgres: Match a category key to its display label with an explicit join condition.
Postgres✓ Tested
Join rows in a chosen order
Aggregate text with STRING_AGG and WITHIN GROUP.
STRING_AGG✓ Tested
Join text rows in a chosen order
Combine values using string_agg.
string_agg✓ Tested
Join through a lookup table
SQL Server: Use explicit aliases and join keys when enriching records through two relationships.
SQL Server✓ Tested
Join through a lookup table
Postgres: Use explicit aliases and join keys when enriching records through two relationships.
Postgres✓ Tested
Keep a function variable local
Bash Scripts: Local prevents an ordinary function assignment from replacing a caller variable.
Bash Scripts✓ Tested
Keep children while clearing a deleted relationship
SQL Server: ON DELETE SET NULL requires a nullable foreign-key column.
SQL Server✓ Tested
Keep children while clearing a deleted relationship
Postgres: ON DELETE SET NULL requires a nullable foreign-key column.
Postgres✓ Tested
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
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
Keep parent rows while filtering joined children
Postgres: Put a child filter in ON when unmatched parents must remain in the result.
Postgres✓ Tested