I\'ve gotten a lot from this community and want to give back. These are questions from my phone screen, for a data engineering role. The key to my success was thinking out loud, to give the interviewer insight into my thought process as I coded. \n\n*Also!* When I got stuck on special cases (e.g., syntax stuff I\'d ordinarily Google), I wasn\'t scared to ask the interviewer for help... for example, I wasn\'t sure if `.split()` happened in place or if I needed to create a new object to store the result, and I just asked. \n\n--------------------\n\n### (Python Q) Mismatched sentences\nWrite a function to identify the words that appear in one sentence but not the other (case sensitive). \n\n**Example**\n- string 1: `"This is the first sentence"`\n- string 2: `"And this is the second sentence"`\n- output: `[\'This\', \'first\', \'And\', \'this\', \'second\']`\n\n\n### (Python Q) Fill an Array\nGiven an array with \'empty\' spots, fill those empty spots with  the preceding number. \n\n**Example**\n- input array = `[8, None, 3]`\n- output array: `[8, 8, 3]`\n\n--------------------\n\n### SQL Qs\nFor the SQL portion, I was given a database schema and asked to calculate ratios from the provided four tables. I wasn\'t given any details on the contents of the tables, besides a listing of their column names. I was just left to ask questions about what I needed. Themes throughout my solutions: \n- use of `WHERE` statements to filter (and wildcard characters to filter string-valued fields)\n- ordering results by the output of an aggregation function\n- using `JOIN`s to pull together multiple tables (e.g., numerator in one table and denominator in another)

I\'ve gotten a lot from this community and want to give back. These are questions from my phone screen, for a data engineering role. The key to my success was t