Results for “Collections & data structures”
Small, practical examples. Search by task or narrow things down below.
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
Match a known text prefix
SQLite: A percent wildcard matches zero or more characters following the prefix.
SQLite✓ Tested
Match a text prefix
SQL: Use a percent wildcard after a known prefix.
SQL✓ Tested
Match a text prefix
SQL Server: Use a percent wildcard after a known prefix.
SQL Server✓ Tested
Match one of several values
Use IN to avoid repeating equality conditions.
IN✓ Tested
Match one value from a short list
SQL: Use IN for a set of allowed values.
SQL✓ Tested