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postgresql – Efficiently find the ultimate parent in multilevel one-to-many tables

Suppose I have a database of multilevel one-to-many tables (a fictitious example):

CREATE TABLE users (
  id SERIAL PRIMARY KEY
);

CREATE TABLE properties (
  id SERIAL PRIMARY KEY,
  user_id INTEGER NOT NULL REFERENCES users(id)
);

CREATE TABLE rooms (
  id SERIAL PRIMARY KEY,
  property_id INTEGER NOT NULL REFERENCES properties(id)
)

CREATE TABLE rates (
  id SERIAL PRIMARY KEY,
  price INTEGER NOT NULL,
  room_id INTEGER NOT NULL REFERENCES rooms(id)
)

For example, suppose a user wants to update that price in the rates But I want to make sure that he is allowed to – d. H rate belongs to a room that belongs to one property that the user owns.

What would be the best / most efficient way to do this? Is there a way to add a deduced user_id Column to rates Table that is automatically filled when the rows are added to the table rates Table so I can use it later in a query like the following:

UPDATE rates SET price=100 WHERE (id=30) AND (user_id=1)`

Decentralization – Why is a job certificate required in Bitcoin?

It seems that the justification for proving work in Bitcoin is that it creates trust in a decentralized trustless network by:

  1. This helps to get a consensus on which version of the blockchain is right if there are multiple temporary competing forks.

  2. make the accepted block chain mathematically immutable (irreversible).

Question: Why is a proof of work required to build trust?

If most users are honest, they would voluntarily enforce the ban to rewrite the blockchain.

If most users are dishonest, they can still rewrite the Blockchain with proof of work by not only surpassing the honest miners, but also simply make a consensus to accept a new fork of the main blockchain as the correct version of the blockchain.

Calculus and Analysis – Wrong derivative for a function I try to define without explicitly specifying the number of variables

Actually, I want to define functions that depend on the number of variables specified during a calculation. My (probably wrong) attempt is

f(x, y, z) /. {f -> (With({s = {##}}, Product(g(i)(s((i))), {i, Length(s)})) &)}

The output is correct,

g(1)(x) g(2)(y) g(3)(z)

but if I try it instead

Derivative(1,0,0)(f)(x,y,z)/.{f->(With({s={##}},Product(g(i)(s((i))),{i,Length(s)}))&)}

I get zero

Naturally

Derivative(1,0,0)(f)(x,y,z)/.{f->(g(1)(#1)g(2)(#2)g(3)(#3)&)}

right there

g(2)(y) g(3)(z) Derivative(1)(g(1))(x)

But this version does not suit me, because I do not know how many variables will be mine before f to have.

I seem to have found what I need – an answer to derivatives of functions with any number of variables? – but I can not figure out how to use them here.

Design Pattern – Improves the search for the confusing Software License ERP Administrator

I'm building a system for 3D CAD niche software with dongle licenses. Both the customer portal and the internal technical support and sales portal. It's very similar to AutoDesk and Adobe, but we do not have a cloud license, but USB dongles. When trying to perform a global real-time search on the datatables.net library, he came across the following:

Enter image description here

The drop-down menu does not filter, but selects from different pools (something like different tables, but not exactly all tables).

Enter image description here

User goals: Find different users or accounts on a second page, where you can review and change detailed information by clicking on a line. This second part mimics a basic CRM / ERP

Enter image description here

Enter image description here

Enter image description here

Current search problems:

  • The drop-down menu does not filter, but selects a pool to search.
  • You can still search for a member in real time if serial code (pool)
    is selected and because there is a connection that is confusing
  • I can not list all providers and their dongles and then click directly on this dongle
  • I can not list all dongles that are used by members (assigned) without duplicates, and then access this dongle directly. I have to find to search again on the second page (account)
    Note: We have a security feature that allows the owner to unlock multiple dongles. Theoretically, it has several dongles and is assigned to them at the same time. So if a dongle is used by a team member, there is a "double assignment". Owners and users, but real customers do not see this, it happens in the backend, but will make the technical support more difficult. You must find this account and then search again in this account
  • Since dongles are not assigned to all members, when searching for members, the search (Real-Time Smart) must be instructed to select from Pool 3

Conditions:

  • The account can be a single user or a company. Created in SSO without
    Purchase Not all accounts have members or dongles

  • An account holder is both owner and member (user of multiple dongles).

  • The link between dongle and account is established when inserting the dongle license
    (Owned) in the account, it does not have to be bought, but it can happen at any time

  • The connection between member and dongle is made by "assigning" a dongle.
    However, the owner is linked to all dongles in this account

  • Not all members have dongles (assigned license)

  • All dongles have owners, if the product was not sold, it belongs
    House account (Cast) or a third party (Reseller)

Possible solutions:

  1. Create 3 pages in the navigation or 3 tabs within and change the name of the search page for each pool (dongle serial number, accounts and members). Disadvantage: People might be confused if they have to navigate to multiple pages. It is boring. However, I have seen this in many CRMS
  2. Use a global search and then filter the duplicates as in Sugar CRM using SQL-like filters. Dev is not satisfied with this idea and it can be confusing and messy
  3. Simplify the data structure and try to move members to the account pool because a team member with no account owner and account can not exist in isolation. Create two pages "Search for account, search for dongle serial number"
  4. SQL joins for cases where relationships are clear and attempt to simplify the pools (data normalization). https://editor.datatables.net/examples/simple/join.html

Disadvantage: Dev is totally against making joins. (not sure because it's hard or you do not know how to do it). You want all relationships to be 1 to 1, but it looks like this is common in programming. This could be done by creating foreign keys in DB, and our library already has this functionality.

Ideal user experience: a real-time search without duplicates

Question: What is the proven simple decision to do in this case?

According to iPhone, the iCloud password is wrong, but it's true [duplicate]

This question already has an answer here:

  • iOS 8 AppleID / iCloud says pass / id is wrong, but definitely not

    2 answers

  • iCloud says the password is wrong, although I know it's right

    3 answers

  • iCloud says "Password is wrong," but I think it's right

    2 answers

I broke my iPhone, so I exchanged the SIM card for a family member and was not logged into iCloud on the unbroken phone, but I keep forgetting my password and needing to reset it. If I go to iforgot, I have to wait 13 days, so I went to icloud.com because I knew I had the password stored in Chrome. I've managed passwords to display them as text and tried to log into my phone with them, but they say they're wrong. I copied and pasted it into the password field on icloud.com and it let me in there, but it still does not work on my phone. I have typed it carefully many times. There is no secret space before or after the characters (capital letters, lowercase letters and numbers), so I do not know what else to try: /