object
It is a database field which is designated for the use of currency values. It will only store numbers, and these will usually be displayed with the currency symbol.
It could be stored in a Memo field, but in reality you would not use Microsoft Access at all to store it. You would store in a Microsoft Word document.
An arbitrary group of fields within a database record. Usually has some meaning in the context of the record. For example a 3-tuple in an address record might be the fields that contain the first, middle and last names of the person in the address field.
A database stores information like names, address, dates of birth etc. When the database is being designed, headings for these things are create, to store the different parts. These are the fields. "Name" is a field, and it could have the fieldname "Name". The designer will often decide to break the name into a first name and a surname. In that case each field would need a different fieldname. They might use "Fname" and "Sname" for example. "DOB" is often used as the fieldname for the field to store Dates of Birth. When the designers are then working to do queries or other programming with the database, they will use the fieldnames to access the data.
you would use a database? You would use it to store data
Usually there is no use of nulls but in some case there might be some use. Like consider a case a persons address has been changed but the new address is not known. In this case it is prefer to left the field null instead of wrong address.
its a unique key use to identify data in database
No, database is not an operating system. Database is a system used by websites or software to store data they use.
because the database holds all your information that you want to store
to store data in a neat and tighty way
These database softwares or RDBMS are used to store the database of a company or an insttution help them to use in future.
no