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What is the difference between a column constraint and a table constraint?
Wiki User
∙ 12y ago
column constraint is for a single column. table constraint is for an entire table.
Wiki User
∙ 12y ago
Shea Gestiehr
Column constraint is for single column study's/data/info/design/measurements limits.
Table constraint if for entire table study's/data/info/design/measurements limits.
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What is the difference between characteristic table and excitation table in a flipflop?
A characterisitic table has the control input (i.e., D or T) as the first column, the current state as the middle column, and the next state as the last column. Basically, it tells you how the control bit affects the current state to produce the next state. An excitation table has the current state as the first column, the next state as the second column, and the control bit as the third column. Basically, think of this as the state you have (first column), the state you want (second column), and what you must set the control bit (third column) to get the desired state you want. The excitation table is used to implement an FSM.
What is the difference between master table and transaction table?
chut
What is the difference between state table and truth table?
A state table defines the behaviour of the of the sequantial function
How you can delete a column from the table?
Can you be more specific? What kind of table do you mean, and what program are you using? A SQL statement like this will do it: alter table tblName drop column colName tblName is the name of the table colName is the name of the column
Shortcut command used to delete a table column?
Delete column
What is mean by type constraint in DBMS?
A foreign key is a type of constraint. In this example the value in a field must be the same as some value in a defined field in another table. Example in a Customer Table you might have a Column (field) named StatusID You would define a foreign key to the table Status, field StatusID. The value in the Customer table, StatusID column must be an entry existing in the Status Table, StatusID column. There are many constraints. The fact that a column can not be NULL (Left blank) is a constraint. Defining what KIND of data, or range of data that can be entered in a column is a constraint.
What is the foreign key constraint?
foreign key constraint defines a column or combinations of columns whose values match the primary key of another table.
What is primary key constraint?
Primary Key is a Constraint Used to avoid Duplicate entries in database table and you define primary key the column doesn't allow NULL values.
What is the difference between period and groups in the periodic table?
the difference between groups (also known as families) and periods is: a group is a column and a period goes across the table remember that
What is domain constraints in DBMS?
each column contains same type of data thus when you select a data type for a particular domain then DBMS will not accept any value of other data type.Further information contributed by Ramona Maxwell. Please visit www.sqlsolver.com:Domain constraints are a user-defined data type which enforces the integrity of the standard data types. A domain consists of all values permitted in a column. In constructing your database you would first select a standard data type such as VARCHAR or INT. You could then constrain or limit the data using NOT NULL, UNIQUE, CHECK, PRIMARY KEY or FOREIGN KEY. For example the CHECK constraint could limit INT data within your domain [column] to numbers less than 5000. You would thus define a custom data type using domain constraints.
What is key constraints?
Primary Key is a Constraint Used to avoid Duplicate entries in database table and you define primary key the column doesn't allow NULL values.
What the differences between primary key and foreign key?
A primary key is a unique identifier for a record in a table and ensures each record is uniquely identified. A foreign key establishes a relationship between two tables by referencing the primary key in another table. It enforces referential integrity by ensuring that the values in the foreign key column correspond to values in the primary key column of another table.
What is the difference between characteristic table and excitation table in a flipflop?
A characterisitic table has the control input (i.e., D or T) as the first column, the current state as the middle column, and the next state as the last column. Basically, it tells you how the control bit affects the current state to produce the next state. An excitation table has the current state as the first column, the next state as the second column, and the control bit as the third column. Basically, think of this as the state you have (first column), the state you want (second column), and what you must set the control bit (third column) to get the desired state you want. The excitation table is used to implement an FSM.
What is the difference between a data chart and a data table?
A chart is graphical, like a pie chart or a bar chart or a column chart. A table is an organised set of figures laid out in a table. You might use figures in the table to make a chart.
What is the difference between primary key and unique index?
Primary key is a type of unique index with no null constraint on the columns involved. There can only be one Primary key whereas you can create other unique indexes on the table.
How do you create a primay key in Oracle?
You can create a primary key column in an oracle table using the PRIMARY KEY keyword. Assuming you have an employee table that has employee information and has a column called emp_num. you can create a primary key in the table using the below command. ALTER TABLE tbl_employee_info add CONSTRAINT emp_pk PRIMARY KEY (emp_num) If you execute the above command in your database, emp_num will become the primary key of the table tbl_employee_info.
What is the difference between a pool table light and a billiards table light?
There is no difference.
