Keyfields crosslink related records in different tables of Relational Databases. But in other kinds of databases (e.g. navigational databases, object oriented databases, flat file databases) other different mechanisms are used or the linking of records is not supported.
Schemas and Tables
That's not a math term. Databases are used in computer science; a database is basically a collection of tables (and related ancillary structures), used to store data in an organized way.
Most modern databases are relational, meaning that data are stored in tables, consisting of rows and columns, and that data in different tables are related by the meanings of certain common columns.
The type of databases that can organize data into a two-dimensional table are called relational databases. In a relational database, data is organized into tables consisting of rows and columns. The tables can then be related to each other through common fields, enabling efficient data retrieval and manipulation. Common examples of relational databases include MySQL, Oracle, and Microsoft SQL Server.
common field
Databases are related in that you can have a database connected to a VB application and able to read/write from it.
A database stores data in a table and the data may or may not be related to other data. The tables in the database also may or may not have any relation with the other tables. A field is the attribute or the column name in a table.In a database, a "field" is the name of a column. You can think of them as fields on a form or in a record, where the rows are other records.
Tables can have columns. You will find them in word processors, spreadsheets and databases. Buildings can have columns.
A table is contained within the database and consists of columns and rows. A table is meant to store data and, in relational databases, are related to other tables within the same database.
An Excel worksheet is a grid, so effectively a table. Any part of it can be used as a table. There are also specialised kinds of tables in Excel, like Pivot tables and one way and two way Data tables. There are also specialised table functions. So in many ways, tables are a major part of Excel.
Yes it is possible to compare two different databases. All you have to do is implement the right script which will compare the information and the structure of the databases.