Example: Effects of Default and User-Specified Case Sensitivity on the Ordering of a Result Set - Teradata Database - Teradata Vantage NewSQL Engine

The following statements create and populate table t:

     CREATE TABLE t (
       a CHAR(4) NOT CASESPECIFIC,
       b BYTEINT)
     PRIMARY INDEX (a,b);
     INSERT INTO t VALUES ('AAAA', 1);
     INSERT INTO t VALUES ('aaaa', 2);
     INSERT INTO t VALUES ('BBBB', 3);
     INSERT INTO t VALUES ('bbbb', 4);

If the default handling of case is allowed, the following statement produces the following results table.

     SELECT *
     FROM t
     ORDER BY a;
     a         b
     ----     ---
     AAAA      1
     aaaa      2
     BBBB      3
     bbbb      4

On the other hand, when you specify CASESPECIFIC for the query, the results are one of the results tables immediately following the example SELECT statements, depending on the collation sequence in effect for the current session.

     SELECT *
     FROM t
     ORDER BY CAST(a AS CASESPECIFIC);

or

     SELECT CAST(a AS CASESPECIFIC), b
     FROM t
     ORDER BY 1;