Results for “group_concat”
Small, practical examples. Search by task or narrow things down below.
Return zero for a sum over no rows
SQL: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQL✓ Tested
Return zero for a sum over no rows
SQL Server: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQL Server✓ Tested
Return zero for a sum over no rows
Postgres: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
Postgres✓ Tested
Return zero for a sum over no rows
SQLite: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQLite✓ Tested
Sum values per category
Calculate a grouped total.
SUM✓ Tested
Wait for concurrent workers
Wait for concurrent workers using a complete Go program with explicit sample inputs.
Go✓ Tested
Attach containers to a user-defined network
Create a dedicated network for a small group of containers.
network✓ Tested
Build text incrementally with StringBuilder
C#: Append fragments instead of repeatedly concatenating intermediate strings in a loop.
C#✓ Tested
Calculate a fixed-window moving average
C: For this small window, sum each complete group and skip incomplete prefixes.
C✓ Tested
Check exact array membership
Bash Scripts: Compare each element literally instead of searching a concatenated string.
Bash Scripts✓ Tested
Count repeated lines after sorting
Linux Commands: Group identical lines before uniq -c, then normalize its leading padding.
Linux Commands✓ Tested
Create a reusable one-to-many lookup
C#: ToLookup groups values by key and returns an empty sequence for an unknown key.
C#✓ Tested