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In addition to @pawelzieba's answer, which definitely is correct, to join two tables, while you can use an INNER JOIN like this . SELECT * FROM expense INNER JOIN refuel ON exp_id = expense_id WHERE refuel_id = 1 via raw query like this -
3 Αυγ 2022 · Updating Record in Android SQLite database table. The following snippet shows how to update a single record.
Following is the code snippet to update the data in the SQLite database using an update () method in the android application. //Get the Data Repository in write mode. SQLiteDatabase db = this.getWritableDatabase (); ContentValues cVals = new ContentValues (); cVals.put (KEY_LOC, location);
3 Ιαν 2024 · To read from a database, use the query() method, passing it your selection criteria and desired columns. The method combines elements of insert() and update(), except the column list defines the data you want to fetch (the "projection"), rather than the data to insert.
Which, in android, can be done like this -. String rawQuery = "SELECT * FROM " + RefuelTable.TABLE_NAME + " INNER JOIN " + ExpenseTable.TABLE_NAME + " ON " + RefuelTable.EXP_ID + " = " + ExpenseTable.ID + " WHERE " + RefuelTable.ID + " = " + id; Cursor c = db.rawQuery( rawQuery, null );
An UPDATE statement starts with the UPDATE keyword, followed by the table name, followed by a SET clause. A SET clause consists of the SET keyword, followed by the name of the column you want to update.
8 Ιουν 2017 · In order to implement the join on two columns simultaneously, you can use an EXISTS predicate: UPDATE Table_1 .
