17.05 - Using Parentheses to Customize Precedence - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)

To override precedence, use parentheses. Operations in parentheses are performed first.

For example, consider the following form:

   ( ( SELECT statement_1 
       UNION 
       SELECT statement_2 )
   EXCEPT
     ( SELECT statement_3 
       UNION 
       SELECT statement_4 )
   )
   EXCEPT 
   SELECT statement_5 
   INTERSECT 
   SELECT statement_6;

The following list explains the precedence of operators for this example.

  1. UNION SELECT statement _1 and SELECT statement _2.
  2. UNION SELECT statement _3 and SELECT statement _4.
  3. Subtract the result of the second UNION from the result of the first UNION.
  4. INTERSECT SELECT statement _5 and SELECT statement _6.
  5. Subtract the INTERSECT result from the remainder of the UNION operations.