Korogwe-Mkalamo-Constraints

Nov 06, 2014

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Korogwe-Mkalamo-Constraints

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Constraints

Constraints. Foreign Keys Local and Global Constraints Triggers. Constraints and Triggers. A constraint is a relationship among data elements that the DBMS is required to enforce. Example: key constraints.

631 views • 39 slides

Constraints

Constraints. Foreign Keys Local and Global Constraints Triggers. Source: slides by Jeffrey Ullman. Constraints and Triggers. A constraint is a relationship among data elements that the DBMS is required to enforce. Example: key constraints.

700 views • 39 slides

Budget Constraints

Budget Constraints. ECO61 Udayan Roy Fall 2008. Prices, quantities, and expenditures. P X is the price of good X It is measured in dollars per unit of good X The consumer pays this price no matter what quantity she buys.

635 views • 25 slides

Spacetime Constraints

Spacetime Constraints. Andrew Witkin Michael Kass Presenter: Fayun Luo. Outline. Introduction and Motivation A Particle Example SQP Method Extension to Complex Models Discussion A Tiny Movie Demo. Early Computer Simulations.

435 views • 27 slides

Constraints

Constraints. B term 2004: lecture 15. Keys: Primary keys and unique. CREATE TABLE Student ( sNumber int, sName varchar (20), dept char (2), CONSTRAINT key PRIMARY KEY (sNumber), CONSTRAINT uniqueName UNIQUE (sName));. Unique vs. primary keys.

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CONSTRAINTS

CONSTRAINTS. TOPICS TO BE DISCUSSED. DEFINITION OF CONSTRAINTS EXAMPLES OF CONSTRAINTS TYPES OF CONSTRAINTS WITH EXAMPLES. CONSTRAINTS.

3.29k views • 13 slides

Database Constraints

Database Constraints. Database Constraints. Database constraints are restrictions on the contents of the database or on database operations Database constraints provide a way to guarantee that: rows in a table have valid primary or unique key values

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Constraints

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Indexical Constraints

Indexical Constraints. A key issue in Constraint (Logic) Programming system, is the implementation of the underlying Constraint Solvers. A number of features of these solvers must be taken into account: The ease in representing domains and generic constraints;

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Representing Constraints

Representing Constraints. ~ Adapted from Walch Education. Key Concepts. When an inequality has one or more variables and contains at least one inequality symbol (<, >, ≤, ≥, or ≠), it is called an algebraic inequality .

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Geological Constraints

Geological Constraints. Lecture 6: Geodynamics Carolina Lithgow-Bertelloni. Constraints. Mass distribution and change Geoid and free air gravity TPW Plate motions past and present Magnetic anomalies Topography Flooding record Stresses Sources Measure strain Record of volcanism.

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More Constraints

More Constraints. October 8. Today. Status of the class Review of MVDs Piazza Refresher Activity. Logistics. Midterm Exam Logistics. The midterm exam moved to Wednesday night, 7pm, October 22nd . 1.5 hours. No room big enough for us. Firas has the req in week 1!

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Constraints

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Integrity Constraints

Integrity Constraints. An important functionality of a DBMS is to enable the specification of integrity constraints and to enforce them. Knowledge of integrity constraints is also useful for query optimization. Examples of constraints: keys, superkeys foreign keys

724 views • 46 slides

Constraints

Constraints. Some basic ones. Some basic integrity constraints: primary keys , not null constraints, and unique constraints. Examples :. CREATE TABLE Movies ( title CHAR(40), year INT, length INT, type CHAR(2), PRIMARY KEY (title, year) );. CREATE TABLE Movies (

640 views • 39 slides

Constraints

Constraints. CSED421 Database Systems Lab. Constraints. To define an integrity constraint (IC) IC : condition that must be true for any instance of the database 5 types of constraints NOT NULL constraints UNIQUE constraints PRIMARY KEY constraints FOREIGN KEY constraints

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Korogwe-Mkalamo-Constraints

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Constraints

Constraints. Overview. Unique Identifiers Arcs Domains Various other constraints. Rembrandt. Identification and Representation. G. Papini, please?. EMPLOYEES. Name PAPINI HIDE PAPINI BAKER. Initials G. T.M. G. S.J.T. Birthdate 02-FEB-1954 11-JUN-1961 02-FEB-1945 24-SEP-1958. JOB

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Constraints

Constraints. Primary Key Constraint. It is derived from the entity UID or created as surrogate key. Uniqueness is enforced by an index: Index is not defined in Oracle Designer All columns in key are mandatory. It should not be updatable. Every table should have one!. Unique Key Constraint.

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Constraints

Constraints. Euclidean space E 3 N System of N particles: x r i r = 1 , N i = 1, 3 3 N coordinates. Motion is specified by second-order differential equations. Initial position Initial velocity. Newtonian Variables. Dynamical variables need not be Cartesian.

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Constraints

Constraints. Review. What is a constraint?. Unique – forbids duplicate values Referencial – Foreign key Check Constraint – sets restrictions on data added to a specific table. SQL vs ADDPFCST. Database Triggers. Trigger?. A condition that causes some procedure to be executed.

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Constraints

Constraints. Constraints in Inventor. ?. Constraints Defined. Constraint - The state of being restricted or confined within prescribed bounds. Perpendicular. The perpendicular constraint causes selected lines, curves, or ellipse axes to lie 90 degrees to one another. Parallel.

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