Ark rock giant mining
on this premise, there are many databases to choose from, such as lightweight SQLite, which can be used as the basic data storage support of app, MySQL and Oracle which need more data performance support, and various key value databases, such as redis and Memcache, can also be used as cache support in project cache service, Of course, a variety of distributed database systems are also a direction of development. For example, oceanbase developed by Alibaba is a financial grade distributed relational database, while rethinkdb is a distributed database with free and commercial authorization. In short, the need to learn the database is not a two problem, but need to start according to the actual situation, starting from the basic relational database learning, and then continue to improve on this basis, learning NoSQL database and distributed database system development is a better learning route. Chain Qiao online sincere offer.
analyzes
the
distributed database of
blockchain technology
:
(1) participants can join at will without permission; (2) the contents of the database are open to all participants; (3) all previous transaction data, that is, the logs of the database, will never be deleted; (4) highly rendant and reliable; (5) inefficient, requiring multiple confirmations before the transaction can be considered completed
Yes
the National College Students' innovation and entrepreneurship competition was held in China University of Petroleum (East China), and 220 entries from 91 domestic universities were shortlisted in the national finals. After fierce competition, four works of Xi'an Jiaotong University, Tsinghua University, China University of Petroleum (East China) and Changzhou University won the special prize
with the theme of "innovation, green, wisdom and future", the competition is sponsored by the Chinese society of higher ecation, the Central School Department of the Communist Youth League and the Shandong Provincial Committee of the Communist Youth League. Since its launch in May this year, it has attracted 269 universities, 2325 teams, 8135 contestants and 1978 entries
extended materials:
the competition encourages competitors to carry out innovation and entrepreneurship in ten fields, including the Internet and mobile Internet (including information technology), electronic technology, biology and life science and technology, advanced manufacturing, materials and energy (including energy conservation and environmental protection), integrated circuit, financial innovation, automotive intelligent ecology, artificial intelligence, and blockchain
support college students to solve long-standing social problems or meet the special needs of some social groups by using the means of market allocation of resources and taking enterprises as the organizational form to carry out social innovation (public Entrepreneurship)
reference materials: College Students' innovation and Entrepreneurship Competition - Introction to the competition
if you want to count cards, you need to remember the cards of others first, and you need to remember clearly the cards of both of you. When a very tired landlord plays cards, you need to see what he plays first. What's more, cheating is OK. Two people are not Yin, one is not moral, ha ha.
hope it can help you, hope it can be adopted.
have this ability, whether in the network or in reality
then how to calculate the card shape? For example, if the "landlord" plays the right card, we have a saying that "the landlord" plays the right card, and most of them play the right card. Although it's not absolute, we're talking about probability now. At this time, it's better for the "farmer" who can't start to put em card in place and be ready to keep the "landlord" card. As a door board, it blocks the "landlord" card. Generally speaking, it's right to take three cards. Otherwise, the "landlord" will choose three cards, or we often say the appendix. After all, it's a hand, Therefore, in the process of "fighting against the landlord", when the shape of the card is not clear,
is very taboo to play the appendix, because once let the "landlord" run two hands. But the "landlord" doesn't have to return the right card if he plays three ways. Why? It is possible that the "landlord" is a big pair of cards, and it is not convenient to bring
to the appendix, because the probability is quite large. When you have more than three identical cards in your hand, such as three 9s, three 10s, and three Chongshun cards, it depends on whether the "landlord" has played your
three identical cards. If not, you should be careful. It is very likely that the "landlord" has, unless he has played all your cards.