Answer:
A key field is used to uniquely identify each record for retrieval or manipulation.
Explanation:
In a database there are many, having similar entities. So in order to differentiate each entity from other we need to set a key field among all the field which is always unique for each entity.
For example:
In a database of a company having data about its employees, the key field might be their ID. As some employees can have same names, addresses, phone numbers but cannot have the same ID.
Answer:
In the View tab, you will find Zoom Option. Set the Zoom level to 100%.
Explanation:
You need to set the Zoom level to 100%, And you can do this, by setting the zoom level to 100%, from the scroll bar. Or you can move to view tab in the main menu, and then in the Ribbon, you need to select the zoom % and set it to 100 percent. You will then be able to see the entire page. And if you want, you can increase the Zoom level to even further, for getting an even more clearer picture.
To make it useable, the disk first needs to be subdivided into logical volumes, then formate, so that it is readable by the systems.
Natural systems are systems that came into being by natural processes. Like the rain cycle.
Technological systems are those to whom people intervened or designed. Like diverting water for a rider for land irrigation.
