Trying to make query on condition - sql

Question

I read most of the solutions here with similar questions and it did not solve my problem and I cannot find anything online that can help me.
I am trying to make query on condition where user_id = session user_id but I get error when I make INNER join
ambiguous column name
for this
public List<CartModelClass>getCarts1(){
SQLiteDatabase db = getReadableDatabase();
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
String[] sqlSelect = { "ID" , "user_id", "food_id", "quantity", "price", "origin", "destination","description","company_name","search_id"};
String sqltable2 = "OrderDetails LEFT JOIN OrderDetails WHERE user_id LIKE '%%' ";
qb.setTables(sqltable2);
Cursor c = qb.query(db,sqlSelect, null, null ,null ,null ,null);
final List<CartModelClass> result = new ArrayList<>();
if (c.moveToFirst()) {
do {
result.add(new CartModelClass(
c.getString(c.getColumnIndex("user_id")),
c.getString(c.getColumnIndex("food_id")),
c.getString(c.getColumnIndex("quantity")),
c.getString(c.getColumnIndex("price")),
c.getString(c.getColumnIndex("origin")),
c.getString(c.getColumnIndex("destination")),
c.getString(c.getColumnIndex("description")),
c.getString(c.getColumnIndex("company_name")),
c.getString(c.getColumnIndex("search_id"))
));
} while (c.moveToNext());
}
return result;
}
so I changed InnerJoin and made it just table where user_id like"%%" but I only get the last user_id who added to cart and show all data for all users
I want to show only added cart for user_id = session user_id so i can use it in here
loadListFood
private void loadListFood(){
sessionManager= new SessionManager(getActivity());
final Hashmap<String, String> user = sessionManager.getUserDetail();
user.get(USER_ID);
listdata = new Database(this.getContext.getCarts1());
for(CartModelClass order : listdata)
user_id = order.getUser_id
if(user.get(USER_ID).equals(user_id)){
listdata = new Database(this.getContext()).getCarts();
adapter = new CartAdapter(listdata, this.getContext());
recyclerView.setAdapter(adapter);
int total = 0;
for (CartModelClass order : listdata) {
total += (Integer.parseInt(order.getPrice())) * (Integer.parseInt(order.getQuantity()));
Locale locale = new Locale("en", "US");
NumberFormat fmt = NumberFormat.getCurrencyInstance(locale);
txtTotalPrice.setText(fmt.format(total));
}
}else {
Toast.makeText(getContext(), "No Cart Added", Toast.LENGTH_LONG).show();
}
}

Answer 1

You are self joining the table OrderDetails.
In this case you must set aliases to both copies of the table, like:
OrderDetails as o1 LEFT JOIN OrderDetails as o2 ...
Now in the ON clause you must qualify the column names properly, like:
ON o1.user_id = o2.something
If you don't, you get that error message, because the column name user_id could belong to either of the 2 copies of the table.
Also:
What is session user_id? Is it a column name?
If it is then the problem is that it contains a space in its name.
Enclose it in square brackets, so the statemnet should be:
OrderDetails as o1 LEFT JOIN OrderDetails as o2
ON o1.user_id = o2.[session user_id]