What development stages did database technology go through?

1, layered and meshed:

The representative product is the hierarchical model database management system IMS developed by IBM in 1969.

2. Relational database:

At present, most databases are relational databases. In 1970, IBM researcher E.F.Codd proposed a relational model. Its representative products are sysem R and Inges.

3. The third generation database will be characterized by richer data models and more powerful data management functions, thus providing new applications that traditional database systems cannot support. It must be object-oriented, open and can be used on multiple platforms.