I have installed OracleXE and imported data into it. From SQLPLUS, I can query the data and it all shows up in English.

However, in SQLDEVELOPER, if I look at the data, it's in a nonsense format, unless I double click on it, where it turns into english? If I query the data through the SQL Worksheet, it displays in rubbish format, but again click on a data item, and it turns into English again?

Before double-clicking:

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After double-clicking:

enter image description here

I am utterly confused.

Any ideas?

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