Change default date format in Oracle

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Revision #9 was created by lenovo on Sep 19, 2019, 1:18:14 AM.

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Default date format in oracle is DD-MON-RR (25-JAN-18). With that output, we can't using date formatting.<br>
Too solve this issue, we must change date format oracle like date commonly using
```
ALTER SESSION SET NLS_DATE_FORMAT=...
```

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