Delete duplicated content in table - sqlite

Question

I've a Table table_news containing these fields :
_ID = INTEGER PRIMARY KEY AUTOINCREMENT
ID = TEXT NOT NULL
CONTENT = TEXT NOT NULL
ZONE TEXT = NOT NULL
AREA TEXT = NOT NULL
TITLE TEXT = NOT NULL
DATE TEXT = NOT NULL
AUTHOR TEXT = NOT NULL
This table is filled like below:
Column Row 1 Value Row 2 Value
------------------------------------------------------
_ID 1 2
ID "5" "5"
CONTENT "Discover New York." "Discover New York."
ZONE "New York" "New York"
AREA "New York" "New York"
TITLE "Let's discover the world." "Let's discover the world."
DATE "2012-07-04" "2012-07-04"
AUTHOR "Henry Brakman" "Henry Brakman"
So I just want to make an SQL statement in order to delete one of these duplicated rows.
I tried this (line breaks added for ease of reading, command is written as single string):
public SQLiteStatement removeSameContentNews() {
return bdd.compileStatement("DELETE FROM table_news "
+ "WHERE _ID NOT IN (SELECT MIN( _ID) "
+ "FROM table_news "
+ "GROUP BY ID, CONTENT, ZONE, AREA, TITLE, DATE, AUTHOR)");
}
But this deleted nothing..
I finally used uniqueness with UNIQUE keyword and it's working properly:
private static final String CREATE_TABLE_NEWS =
"CREATE TABLE " + TABLE_NEWS + " (" + COLUMN_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_ID
+ " TEXT NOT NULL UNIQUE, " + COL_CONTENT
+ " TEXT NOT NULL, " + COL_ZONE + " TEXT NOT NULL, "
+ COL_AREA + " TEXT NOT NULL, " + COL_TITLE
+ " TEXT NOT NULL, " + COL_DATE + " TEXT NOT NULL, "
+ COL_AUTHOR + " TEXT NOT NULL);";

Answer 1

You can use this example of query:
DELETE FROM table WHERE _ID NOT IN (
SELECT MIN( _ID)
FROM table
GROUP BY ID, CONTENT, ZONE, AREA, TITLE, DATE, AUTHOR
)
EDIT
Alternatively you could use :
DELETE FROM table_news WHERE EXISTS
(SELECT 1 FROM table_news t
WHERE t.ID=table_news.ID AND
t.ID=table_news.CONTENT AND
t.ID=table_news.ZONE AND
t.ID=table_news.AREA AND
t.ID=table_news.TITLE AND
t.ID=table_news.DATE AND
t.ID=table_news.AUTHOR AND
t.rowid > table_news.rowid)