17.10 - Example - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1145-171K
Language
English (United States)

To select rows of t1 whose values in column x1 are equal to the value in column x2 of t2, one of the following queries can be used:

   SELECT * 
   FROM t1 
   WHERE x1 IN 
    (SELECT x2 
     FROM t2);
   SELECT * 
   FROM t1 
   WHERE EXISTS 
    (SELECT * 
     FROM t2 
     WHERE t1.x1=t2.x2);

To select rows of t1 whose values in column x1 are not equal to any value in column x2 of t2, you can use any one of the following queries:

   SELECT * 
   FROM t1 
   WHERE x1 NOT IN 
    (SELECT x2 
     FROM t2);
   
   SELECT * 
   FROM t1 
   WHERE NOT EXISTS 
    (SELECT * 
     FROM t2 
     WHERE t1.x1=t2.x2);
   
   SELECT 'T1 is not empty' 
   WHERE EXISTS 
    (SELECT * 
     FROM t1); 
   
   SELECT 'T1 is empty' 
   WHERE NOT EXISTS 
    (SELECT * 
     FROM t1);