A - FALSE; describe displays only NOT NULL constraint
B - TRUE;
C - TRUE; see A
D - TRUE; e.g. DESC user_cons_columns;
E - FALSE; dictionary views USER_CONS_COLUMNS, ALL_CONS_COLUMNS and DBA_CONS_COLUMNS shows constraints, not DESCRIBE
F - FALSE; it can be used from SQL Developer
I use describe comand in sqldeveloper, i guess the answers are not totaly right
upvoted 4 times
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