【求指点】如何得到SQLiteDatabase.execSQL执行求和sql语句的和值？

String sql = " select sum( " + RUN_TIME + " ) from " + TABLE_NAME2 + " where " + USER_TEL + " = " + userTel;
mSQLiteDatabase.execSQL(sql);

语法错了mSQLiteDatabase.execSQL 不能执行select语句，改成rawQuery