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V0189:
The specification states the following:
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Subclause 11.63, "<user-defined cast definition>": <user-defined cast definition> ::= CREATE CAST <left paren> <source data type> AS <target data type> <right paren> WITH <cast function> [ AS ASSIGNMENT ] ... Conformance Rules Without Feature S211, "User-defined cast functions", conforming SQL language shall not contain a <user-defined cast definition>. Subclause 11.64, "<drop user-defined cast statement>": <drop user-defined cast statement> ::= DROP CAST <left paren> <source data type> AS <target data type> <right paren> <drop behavior> ... Conformance Rules Without Feature S211, "User-defined cast functions", conforming SQL language shall not contain a <drop user-defined cast statement>.
Microsoft SQL Server 2008 R2 and Microsoft SQL Server 2012 vary as follows:
Transact-SQL does not support this feature.