%sOnly ‘http://www.w3.org/2001/XMLSchema#boolean?’ or ‘node()*’ expressions allowed in conditions and with logical operators, found ‘%ls’

Error Message:
Msg 2204, Level 16, State 1, Line 6
%sOnly ‘http://www.w3.org/2001/XMLSchema#boolean?’ or ‘node()*’ expressions allowed in conditions and with logical operators, found ‘%ls’

Severity level:
16.

Description:
This error message appears when in an XQuery a non-boolean or node() expression is found in a condition or logical expression.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Errors of the Severity level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be run this way. Only boolean or node() expressions can be used in a condition or logical expression.

Versions:
This error message was introduced with SQL Server 2005.

Example(s):
DECLARE @xml xml;
SET @xml = ”;
SELECT
    @xml.query(‘for $a in(1, 2, 3), $b in (1, 2, 3)
    where
        ($a – $b) + xs:decimal(9)
    return sum($a + $b)’) as XML;

Remarks:
In the above example we try to use an expression in the where part of the XQuery that does not evaluate to a boolean value. This raises the error.




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