In the first query, the filtering predicate is expressed on the CHAR column "Zip" generated by the XMLTABLE function.

在第一个查询中，过滤谓词是在由xmltable函数生成的char列“Zip”上表达的。

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For our example, item_id is a char column that stores only numeric characters, as we indicate in the following statement.

对于我们的例子，item_id是一个char列，它只存储数字字符，如以下语句所示。

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If you know the UTF-8 encoding of a character, you can also use this method to enter Unicode characters in a char or VARCHAR column.

如果知道字符的UTF - 8编码，也可以用这种方法在CHAR或varchar列中输入unicode字符。

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