Error Conditions - Analytics Database - Teradata Vantage

SQL Functions, Expressions, and Predicates

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2024-01-12
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lifecycle
latest
Product Category
Teradata Vantageā„¢

The following conditions or expressions are considered illegal in a CASE expression:

Condition or Expression Example
A condition after the keyword CASE is supplied.
SELECT CASE a=1
        WHEN 1
        THEN 1
        ELSE 0
        END
FROM t;
A non valid WHEN expression is supplied in a valued CASE expression.
SELECT CASE a
        WHEN a=1
        THEN 1 
        ELSE 0 
       END 
FROM t;
A non valid WHEN condition is supplied in a searched CASE expression.
SELECT CASE 
        WHEN a
        THEN 1 
        ELSE 0 
       END 
FROM t;
SELECT CASE
        WHEN NULL
        THEN 'NULL'
       END
FROM table_1;
A non-scalar subquery is specified in a WHEN condition of a searched CASE expression.
SELECT CASE 
        WHEN t.a IN 
         (SELECT u.a 
          FROM u)
        THEN 1 
        ELSE 0 
       END 
FROM t;
A CASE expression references multiple UDTs that are not identical to each other.
SELECT CASE t.shape.gettype()
        WHEN 1 
        THEN NEW circle('18,18,324')
        WHEN 2
        THEN NEW square('20,20,400')
       END;