Results for “missing data”
Small, practical examples. Search by task or narrow things down below.
Limit a value to a safe interval
Clamp an integer between chosen endpoints.
constrain✓ Tested
List distinct values
Remove duplicate category values from a result.
DISTINCT✓ Tested
Look up a map key
Use find to read a C++ map without inserting a missing key.
C++✓ Tested
Make a pair of columns unique together
SQL: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL✓ Tested
Make a pair of columns unique together
SQL Server: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL Server✓ Tested
Make a pair of columns unique together
Postgres: A composite primary key permits repeated individual values while forbidding a duplicate combination.
Postgres✓ Tested
Make a pair of columns unique together
SQLite: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQLite✓ Tested
Map an input range to an output range
Scale an integer reading to a different interval.
map✓ Tested
Mark a longer quotation and its source
HTML: Blockquote marks quoted content; a visible source link remains useful because cite is metadata.
HTML✓ Tested
Match a known text prefix
SQL: A percent wildcard matches zero or more characters following the prefix.
SQL✓ Tested
Match a known text prefix
SQL Server: A percent wildcard matches zero or more characters following the prefix.
SQL Server✓ Tested
Match a known text prefix
Postgres: A percent wildcard matches zero or more characters following the prefix.
Postgres✓ Tested