Data structures can be a hard part of programming. That doesn't mean folks don't chose the wrong data structures all the time in any language. An array instead

Data structures can be a hard part of programming. That doesn't mean folks don't chose the wrong data structures all the time in any language. An array instead of a linked list or vice versa. A dequeue instead of a set or vice versa. A binary tree instead of a B+ tree. You can't just throw column names at a DB schema and hope for the best. There's actual engineering to be done, even if many programmers refuse to admit it when interacting with a relational database engine.