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Is it possible for the computer to generate values that are used as the primary key column?
Wiki User
∙ 12y ago
Yes. Often times, an automatically generated key column will be a normal primary key using the auto_increment attribute.
Wiki User
∙ 12y ago
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Entity integrity constraint?
The entity integrity constraint states that no primary key value can be null. This is because the primary key value is used to identify individual tuples in a relation. Having null value for the primary key implies that we cannot identify some tuples. This also specifies that there may not be any duplicate entries in primary key column key row.
What part of a computer performs calculations and other computing operations?
The Central Processing Unit or CPU.
What are the components of relational database?
Table, index, trigger and column Table, index, trigger and column
On the search results screen what does the documents column show?
Number of Documents an Authorized Official is authorized to see
Where does a column and row intersect on a spreadsheet?
The intersection of a column and a row in a worksheet is a cell. The address of the cell is the combination of the column and the row. The Column's address is a letter; the row is a number. Cell A1 is in the upper left hand corner. Cell B1 is to its right but cell A2 is underneath it.
How is a primary key specified?
You select the column were the entity you want to make a primary key is located and then u right click the column and then select set as primary key.
How can a Foreign Key and a Primary Key interact with each other?
A foreign key in a table references the primary key in another table, creating a relationship between the two tables. This ensures referential integrity, meaning that values in the foreign key column must exist in the primary key column. This relationship allows data to be linked and maintained consistently between the tables.
Which column on a hazmat table illustrates the primary subsidiary hazards of a material?
Column 6
What does the word column means on a computer?
C.p.u.
In My computer you can sort file names alphabetically by clicking the column heading?
By clicking the NAME column heading.
In My Computer you can sort file names alphabetically by clicking what column heading?
Name column heading.
The primary curves of the vertebral column are the?
In the fetal and neonatal spine, the vertebral column curves of the cervical, thoracic, lumbar, and sacral all oriented as anterior concave curves. and are designated primary curves. To get the state legislature to adopt rules that require sequential lineups
What is a primary curvature?
Primary curvature is the concave curve of the fetal vertebral column. This is apparent in the adult thoracic and sacral regions.
Why you need primary key and foreign key?
In sql you use primary key more than one column in a table
What is the primary function of the vertebral column?
The primary purpose of a vertebral column is to protect the group of nerves thus enclosed. Consider the fish, or most animals which have a horizontal column. This column also acts as an anchorage for muscles and tendons, thus facilitating movement of the organism. Only in a few animals, is the vertebral column approximately vertical, and in this attitude, it enhances the apparent height of the animal, thus offering the animal a superior height for vision.
What is the process to create a primary key event handler for title column?
Primary key uniquely identifies a list item. In sharepoint 2010, go to column settings of 'title' fieldand check the checkbox - enfore unique values'.
What are the differences between primary key foreign key and candidate key?
A primary key is a column which uniquely identifies the records in a table. In a broad sense, a primary key is the mixture of a unique key and an index: A column with a primary key is indexed to deliver a faster query, and doesn't allow duplicate values to ensure specific data. Most programmers recommend all tables having a primary key (and only one) to enhance the speed of queries and overall database performance. An example of a primary key may be found in a table named "departments," which might have a column named "department_number" that uniquely identifies each department in the table with a number.A foreign key is a column (the child column ) in a table which has a corresponding relationship and a dependency on another column (the parent column ) that is usually in a different table. Parent columns can have multiple child columns, but a child column can only have one parent column. The child column is the column with the foreign key; the parent column does not have the foreign key "set" on it, but most databases require the parent column to be indexed. Foreign keys are made to link data across multiple tables. A child column cannot have a record that its parent column does not have. Say a table named "employees" has 20 employees (rows) in it. There are 4 departments in the "departments" table. All 20 employees must belong to a department, so a column in the "employees" table named "department" would point to the primary key in the "departments" table using a foreign key. Now all employees must belong to a department as specified by the "departments" table. If a department isn't specified in the "departments" table, the employee cannot be assigned to it.A candidate key would be any key which could be used as the primary key, which means that the combination of the columns, or just the single column would create a unique key. You would then need to determine which of these candidate keys would work best as your primary key.
