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Which of the following keys must be unique within a given table?
Wiki User
∙ 13y ago
There is insufficient information in the question to properly answer it. You did not provide "the following". Please restate the question.
In general, however, unique indexes with a not null constraint must be unique, and primary key constraints must be unique.
Wiki User
∙ 13y ago
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In a database files are called?
A database holds records in files that are called tables. Each table has a specific key that defines that table and each master key is unique.
What is the table of contents?
The table of contents is generally within the first three pages of a eBook. It is a list of chapters located throughout the book.
Can sinhala mining?
we will bepractikin table manners on evry thurs day startin from please be kind enough to the following on that day
How page table size calculate when virtual address space and page size and page table entry size given?
To calculate the page table size, divide virtual address space by page size and multiply by page table entry size. Example: for a 120MB address space with a 4KB page size, you require 30,720 page table entries. If a page table entry is 4 bytes, you require a total page table size of 122,880 or 120KB.
What is the difference between Primarey key and Forn Key?
establishing a relation between two tables called fornkey.......the colum name should be unique is called "primary key"...a table contain only one primary key...a table contain more then one fornkey....
What is typically unique in each database table?
ID number
What does it means not qualify a column in using clause?
Column names do not have to be unique within a database; they only have to be unique within a particular table. If a query joins two table where each contains a field with the same name and that field is specified in the SELECT or WHERE clause, not qualifying the column name with the table name results in ambiguity as to which field is desired.
What is unique key in database programming?
A unique key is comprised of a single column or a set of columns that can be used to uniquely identify a single row in a table. No two rows in a table can have the same non-Null value(s) in the column(s) that comprise the unique key. A table may have more than one unique key.Example:Suppose we have a table called "employees" in an employee database, and that table contains the following columns:FirstName, LastName, EmployeeID, HireDate, SSN, DateOfBirth, Department, JobTitleThis table has at least two unique keys, EmployeeID and SSN (social security number) since both values are defined as being globally unique. In addition, {FirstName, LastName, EmployeeID} is also a unique key, as are any combination of columns that, when combined, exist in one and only one row in the table.In this example, EmployeeID and SSN are both minimal unique keys. On their own, they each exist in one and only one row. Any unique key in a table can be the table's primary key. There is one and only one primary key in a table.
What is a table within a table?
A nested table.
What is the equation for a given table?
It depends on the value given in the table.
What is a term for a table within a table?
A nested table.
Which of the following statements best explains why a book resting on a table is in equilibrium?
I am sorry but we can't answer because we don't know the selection you were given.
What the difference between primary key and scendary key?
A primary key is a unique identifier for a record in a database table and is used to ensure each record is uniquely identifiable. A secondary key is a key used for sorting and indexing purposes, but can have duplicate values within a table.
Does each element have a unique name and formula on the periodic table?
Yes, each element on the periodic table has a unique name and chemical symbol.
What name given to the table of elements?
The Periodic Table.
What is the unique letter of an element on the periodic table?
Symbol
What is unique about the halogens on the periodic table?
Halogens are the most reactive non-metals on the periodic table.
