Table Notation
For each view, the columns are listed with their names, data types, indications, if NULL is possible, and short description. The data types are shown here as symbolic identifiers to describe a specific role:

identifier | CHAR(128).
yes_no | CHAR(3) with a content of "YES" or "NO".

All undelimited identifiers in the catalog are represented in upper case characters.
"Y" in the column "N" indicates that the column may contain NULL values. "N" in the column "N" indicates that the column must not contain NULL values.