Similar columns in different tables should be declared with same data types, so that the implicit type-casting facility of Oracle is not used.
不同的表中相似的列应该声明为相同的类型，这样就可以不使用Oracle的隐式类型转换。
Similar columns in different tables should be declared with same data types, so that the implicit type-casting facility of Oracle is not used.
不同的表中相似的列应该声明为相同的类型，这样就可以不使用Oracle的隐式类型转换。
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