Oracle Application Developer interview questions

Round 1: 2 dsa 2 sql 1 oops Dsa1 - check for binary tree is symmetric or not Dsa2 - given an array, make a number by concatenating the array numbers. Oops - polymorphism Sql - 1 easy 1 tough query Round2: 1 dsa question Given a matrix of stations x trains. Matrix = 1 represent train start from that station and another 1 means train ends at that stations. Stations are linear. Find the path from source to destination with minimum train changes Another question: Rest and UI api are updating a database. Rest api erroneously considers primary id as string and append 1 to it while UI api normally increments the ID. Rectify the rest api errors. Round3: Some common questions: Check if solved sudoku is valid in one traversal (can visit one cell only once) Sukdo solving without backtracking Given a date, and number of days; find the next date after adding number of days… Round4: HR (chill)