Results for “SQL Server”
Small, practical examples. Search by task or narrow things down below.
Insert or update on a key conflict
Use a unique key to update an existing row.
ON CONFLICT✓ Tested
Inspect deleted rows
Return values from the rows a DELETE removes.
DELETE✓ Tested
Join a parent to pre-aggregated totals
Postgres: Aggregate the child rows first to produce at most one joined row per parent.
Postgres✓ Tested
Join related rows from two tables
Postgres: Match a category key to its display label with an explicit join condition.
Postgres✓ Tested
Join text rows in a chosen order
Combine values using string_agg.
string_agg✓ Tested
Join through a lookup table
Postgres: Use explicit aliases and join keys when enriching records through two relationships.
Postgres✓ Tested
Join values with a delimiter
Concatenate rows in a specified order.
group_concat✓ Tested
Keep children while clearing a deleted relationship
Postgres: ON DELETE SET NULL requires a nullable foreign-key column.
Postgres✓ 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
Keep rows matching a condition
Postgres: Use WHERE to select rows with a particular category.
Postgres✓ Tested
Keep unmatched rows with LEFT JOIN
Show every product even when stock is missing.
LEFT JOIN✓ Tested
Label rows with CASE
Derive a readable label from a condition.
CASE✓ Tested