Web Reference: When you use CAST to convert a CLOB value into a character data type or a BLOB value into the RAW data type, the database implicitly converts the LOB value to character or raw data and then explicitly casts the resulting value into the target data type. The most common form of a predicate is: For the sake of simplicity we are going to consider implicit conversion during SELECT statements and we’ll suppose the predicate to be of the following form: Any function explicitly or implicitly applied to the will prevent the index on that column from being used. This is why the should a... Apr 16, 2011 · I understand how to fix the problem, but I wonder why this occurs on some DB installations and on most it doesn't. This is of high importance for me because it's very difficult to inspect legacy code for wrong parameter types.
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