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How to undo picture shape in Excel?
Use the Ctrl - Z key combination or click on the Undo icon.
Difference between composite and primary key?
There are two types of keys in any database; composite and primary keys. Composite key differs from primary key in that it contains more than one column while primary key is composed of only one field and cannot have a null value.
Which field MS Access will not allow you to delete?
A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.
How could one change a blackberry wallpaper?
Go to the main home screen and press the menu key one time. This will display your application icons. Click your media icon than click pictures. Select the folder that contains the picture you want to use and click on it. Highlight the picture you want to use. Press the menu key once than click on set as home screen image. Return to your home screen and your picture should be showing up there.
Can super key be as primary key?
I think super key is treated as the primary key because in a table their will be only one primary key.
What are the importance of primary key?
Importance of primary key
What does the primary key in a data base do?
We know that primary key is the one that is not null and is always unique. A primary key uniquely identifies a record in a table.
What are the advantage of primary key?
Primary key that is used to identify a record uniquely. Primary key is a key that always unique and not null. A system generated primary key is called surrogate key.Primary key is the one which is always unique and not null. Advantage of primary key that it helps in identifying a tuple uniquely.
What is the primary key for the properties table?
Primary key is to set property ID as the primary key for the properties table.
Does Access automatically creates and maintains an index for a table's primary key?
Access automatically creates an index for the primary key field in a table. In addition, Access automatically creates an index for any field name that contains the following letter sequences: code, ID, key, or num.
How you create or assign primary key?
A primary key is never null and is also unique . Example of primary key is create table emp (ecode integer NOT NULL PRIMARY KEY);
Why do you designate one of the candidate key of relation to be the primary key?
We designate one of the candidate key of a relation to be a primary key because that primary key is use for any foreign key references.
