Why does Oracle SQL Developer use such strange delete criteria? -

When removing rows in the grid view, the message panel indicates that the SQL developer issues this removable command.

  "Delete" from "MH" Where is "T" ROWID = 'above + aaaaaaaajetraa' and 'orao oscran =' 1220510600 9 'and ("A" blank or "A" is not empty)  

It seems that ROWID must be sufficient to identify the line, therefore

• Why does it specify ORA_ROWSCN?
• Fade more, why is not the vacant / zero segment?

ROWID is the physical address only if line one line If the second row is inserted and the second row is inserted, then the new row can be the same ROWID as the old row if the data was modified in the row, it is also possible that its ROWID can change ORA_ROWSCN Criterion ensures that neither of these has actually happened to be able to alert you to SQL Developers Allows you to modify the data while reading it in another session so that you can confirm that you still want to delete the row.

Code> A is zero or A is not empty Wardडेट has to be added. If this was the first meaning, then I think this standard was 1 = 1 that people sometimes add to queries that dynamically process the SQL statement dynamically Is made to make it easy but it does not fit with the final bill in the query. Is the primary key of the table A ?