Tipo '%1' no válido para WAITFOR. Los tipos de datos admitidos son CHAR/VARCHAR, NCHAR/NVARCHAR y DATETIME. WAITFOR DELAY admite los tipos de datos INT y SMALLINT.
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English version
Invalid type '%1' for WAITFOR. Supported data types are CHAR/VARCHAR, NCHAR/NVARCHAR, and DATETIME. WAITFOR DELAY supports the INT and SMALLINT data types.