16.20 - For ALL - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Functions, Expressions, and Predicates

prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1145-162K

Two nested NOT EXISTS can be used to express a SELECT statement that embodies the notion of “for all (logical ∀) the values in a column, there exists (logical ∃) …”

For example the query to select a ‘true’ value if the library has at least one book for all the publishers can be expressed as follows:

   SELECT 'TRUE' 
   WHERE NOT EXISTS
    (SELECT * 
     FROM publisher pb 
     WHERE NOT EXISTS
      (SELECT * 
       FROM book bk 
       WHERE pb.PubNum=bk.PubNum);