Lookup tables are data structures that allow fast access to data stored using a known key or SQL query. This way you can reduce the need to browse a database or data files.
Remember that you should not use lookup tables in the
All data records stored in any lookup table are kept in files, in databases or cached in memory.
Lookup tables can be internal or external (shared).
|Simple Lookup Table|
|Database Lookup Table|
|Range Lookup Table|
|Persistent Lookup Table|
|Aspell Lookup Table|
Lookup tables can be accessed using CTL functions, see Lookup Table Functions.