There is INTEGRITY CONSTRAINTS on database.Types of integrity constraints are: (1) Non-null (2) Key (3) Referential integrity (4) Attribute-based (5) Tuple-based (6) General assertions Example schema: Student(ID, name, address, GPA, SAT) Campus(location, enrollment, rank) Apply(ID, location, date, major, decision) Example constraints:- A student with GPA 3.0 can only apply to campuses with rank 4.- All applications with date 1/1/01 have non-NULL decision.- Apply.ID and Apply.location appear in Student.ID and Campus.location, respectively.- Campus.rank 10.

Constraints are rules applied to a theme. The Scenario evaluates the features ofthe theme based on the rule and informs the user when a feature or features breaksit. A typical Constraint would be that buildings can only be constructed on slopesless than a certain value. If, in the course of laying out a new subdivision, theuser places a building on a steep slope, then Scenario Constructor will display awarning. The user can heed the warning and change the position of the building orleave it where it is. Constraints do not have to be followed.

A rule applied to a table or column that restricts the data allowed in any row in the table.

a condition which must be satisfied relative to the rows of a table com

an automatic rule applied to a column, or related columns, that determines the course of action when the value of a row is somehow altered

an object used to place rules on data

a property assigned to a column or the set of columns in a table that prevents certain types of inconsistent data values from being placed in the column(s)

a relation that should be satisfied for example, that a line remain horizontal, that a resistor in an electrical circuit simulation obey Ohm's Law, or that one column in a web page table be at least twice as wide as another

a rule of the form Delta where Delta is a list of literals from some signature oe

a rule that governs data values in tables and columns, or that governs data relationships across columns in different tables

a rule that is applied to a list when its data is changed

a rule that the database manager enforces

a rule to which data must conform

a rule used to maintain the integrity of data in a DataTable

a special kind of rule

a statement or rule that is externally imposed

Restriction placed upon the value that can be entered into a column or a row. For example, age cannot be 0 or 110. Compare with check constraint, unique constraint.

The mechanism that ensures that certain conditions relating columns and tables are maintained.

Constraints are specifications for the implementation process. There are several categories of constraints: routing, timing, area, mapping, and placement constraints. Using attributes, you can force the placement of logic (macros) in CLBs, the location of CLBs on the chip, and the maximum delay between flip-flops. CLBs are arranged in columns and rows on the FPGA device. The goal is to place logic in columns on the device to attain the best possible placement from the standpoint of both performance and space.

A restriction on the values contained in a particular database object, such as a table or column. For example, a column may have a uniqueness constraint, which requires that all values in the column be different. A table may have a foreign key constraint, which specifies how the information in the table relates to data in some other table. See also: check constraint, foreign key constraint, primary key constraint, unique constraint.

Primary Keys, Unique Constraints, Foreign Keys, Checks, With Check Option. Limits what data can or cannot go into a column.

(also see validation) - storyteller constrained by rules of inherited cultural tradition *** (one wouldn't need waters of life to fly away from a villain) and the tale by rules of common sense

In a database, a rule that ensures the integrity of data. Constraints can apply to columns or tables. An example of a -column-level constraint is that the values it contains must be unique.

Data rule or restriction that is enforced within the database rather than at application or object level. The following constraint types are available in Oracle: primary key, unique key, foreign key (references), check constraint, NOT NULL, etc.

A rule that limits the values that can be inserted, deleted, or updated in a table. See check constraint, referential constraint, and unique constraint.