What is the difference between Blockchain and a Database?Generally a database is a collection of data which can be stored and organized using a database management system. The people who have access to the database can view or edit the information stored there. The client-server network architecture is used to implement databases. whereas a blockchain is a growing list of records, called blocks, stored in a distributed system. Each block contains a cryptographic hash of the previous block, timestamp and transaction information. Modification of data is not allowed due to the design of the blockchain. The technology allows decentralized control and eliminates risks of data modification by other parties.
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Yes, MongoDB is more flexible in some searches and in one particular indexing scenario - Postgres does not provide an index supporting range queries for arrays. But, it is not a common case by any means and there are workarounds.
习近平同志在地方工作时的两个故事，至今仍给人以深刻启迪——
第六十九条 托运人应当及时向港口、海关和其他主管机关办理货物运输所需要的各项手续，并将已办理各项手续的单证送交承运人；因办理各项手续不及时、不完备或者不正确，使承运人的利益受到损害的，托运人应当承担赔偿责任。