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Initially Deferred Constraint | Deferrable Constraint in Oracle | Deferred Constraints Oracle
 
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Initially deferred constraints are required in special situations where the constraint checking is required to be delayed until the commit.Deferrable constraint in Oracle has been demonstrated here. The video contains example on deferred constraint using the case of storing the data of two employees in relationship as husband and spouse #IntegrityConstraints #LearnSQL #Crazy4DB #SQLBasics #MunshiSir #DBMSBasics #BasicSQL #Constraints Interview Questions : (1) What is the normal mode of data integrity checking? What does it mean? (2) What are the two options for delaying the integrity verification of the data to the transaction level? DBMS Keys Tutorial : https://youtu.be/DLrCop3-I2M Integrity Constraint Part 1 Video : https://youtu.be/MaZIN_MVFY8 Integrity Constraint Part 2 Video : https://youtu.be/dLzuFmFiHxk Integrity Constraint Part 3 Video : https://youtu.be/l6C-gmIaswA My web site : http://www.oracletrainingnagpur.com My blog : https://crazy4db.blogspot.in My facebook page : https://www.facebook.com/crazy4db/
Views: 139 Crazy4 DB
Deferrable Initially Deffered- Oracleadda.com
 
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Deferrable keyword in SQL. This is used where we need to invalidate referential integrity between two tables while inserting the data. By using this keyword, the integrity check can be made at the time of committing the transaction. Please visit : www.oracleadda.com and post any queries related to Oracle. Will reply you back at earliest. Thank You
Views: 1666 Oracleadda
Oracle - SQL - Constraints
 
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Oracle - SQL - Constraints Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Anadi Sharma, Tutorials Point India Private Limited.
Using DEFERRED Constraints in Oracle/ arabic
 
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Using DEFERRED Constraints in Oracle/ arabic maxvlearn.com
Views: 429 khaled alkhudari
087-Oracle SQL 12c: DEFERRABLE Constraints/ هاي حلوه
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر EXAM 1Z0-061 EXAM 1Z0-071
Views: 1519 khaled alkhudari
ATOMICALLY { DELETE YOUR ACTORS } - John A De Goes & Wiem Zine Elabadine | Scalar 2019
 
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Moore's Law may be dead, but CPUs acquire more cores every year. If you want to minimize response latency in your application, you need to use every last core - without wasting resources that would destroy performance and throughput. Traditional locks grind threads to a halt and are prone to deadlocks, and although actors provide a saner alternative, they compose poorly and are at best weakly-typed. In this presentation, created exclusively for Scalar Conf, John reveals a new alternative to the horrors of traditional concurrency, directly comparing it to other leading approaches in Scala. Witness the beauty, simplicity, and power of declarative concurrency, as you discover how functional programming is the most practical solution to solving the tough challenges of concurrency. Join next Scalar http://scalar-conf.com/ https://twitter.com/scalarconf Contact organisers: https://softwaremill.com/
Views: 4048 SoftwareMill
Oracle SQL Tutorial 12 - Intro to Constraints
 
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As I believe I've mentioned in an earlier video, a constraint is basically a rule we can put in our database that prevents someone from putting the wrong data in. It protects our relationships and data integrity. Because the goal of these constraints are to protect our data integrity, you may hear them called integrity constraints. There are many integrity constraints we are going to talk about: NOT NULL UNIQUE PRIMARY KEY FOREIGN KRY CHECK There is also the DEFAULT attribute. These are all keywords we can add to our columns that will change the way the database works with our data and also prevents incorrect data. NOT NULL is a constraint you can put on a column that prevents nulls. A null is the absence of a value. When we say null, we are saying that every single row has to have a value for this column. UNIQUE is a constraint that makes every row have a unique value for this column. Now note, this does not require values to be put it, and it will allow multiple rows to be null. Next, we are going to talk about primary keys. What qualifies a column as a candidate key? First, not a single row should have a null for that column. Second, every row must be unique. The primary key constraint is essentially a combination of the NOT NULL constraint and the UNIQUE constraint. The foreign key constraint sets the requirement that any value in this column for any row must match a row in another column. Check constraints allow us to be more strict with what data is allowed in our database. NOT NULL and UNIQUE give some level of restriction, but what if we want something more specific? For example, what if we only want values between 0 and 100? That is where check constraints come in. When using check constraints, you give a boolean expression. A boolean expression is something that can be evaluated to true or false. It will only insert the row if the value you try to put into the row makes the expression evaluate to true. So if you put in a value too great or small, the expression will be false and the data is not allowed to be entered. The default constraint is a value you can give a column, and if for any reason when the row is created in the table a value is not provided, the default value will be given. So for example, we could have a bank account table where the balance defaults to 0. How do you actually implement these constraints when you are creating a table? In the next video we are going to be adding these to our users table. Please be sure to subscribe! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Support me on Patreon: http://www.patreon.com/calebcurry Subscribe to my newsletter: http://bit.ly/JoinCCNewsletter Donate!: http://bit.ly/DonateCTVM2. ~~~~~~~~~~~~~~~Additional Links~~~~~~~~~~~~~~~ More content: http://CalebCurry.com Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://twitter.com/calebCurry Amazing Web Hosting - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 26516 Caleb Curry
Oracle Tutorial || Oracle| Sql Constraints Part - 1 by basha
 
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44. Unique Constraint in Oracle
 
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In this video you will learn about Unique Constraint in Oracle. The UNIQUE constraint uniquely identifies each record in a database table. The UNIQUE and PRIMARY KEY constraints both provide a guarantee for uniqueness for a column or set of columns. A PRIMARY KEY constraint automatically has a UNIQUE constraint defined on it. Note that you can have many UNIQUE constraints per table, but only one PRIMARY KEY constraint per table. For Support =========== Email: [email protected] Contact Form: http://www.learninhindi.com/home/contact Our Social Media ================ Facebook: https://www.facebook.com/LearnInHindi Twitter: https://twitter.com/LearnInHindi For Training & Videos ===================== For more videos and articles visit: http://www.learninhindi.com Free Java Programming In Hindi Course ===================================== https://www.youtube.com/playlist?list=PLOZ3jentlCDAwwhMyoLISrxkXTADGp7PH Free Oracle PL/SQL Programming In Hindi Course ============================================== https://www.youtube.com/playlist?list=PLB5DA82419C2D99B6 Free C Programming In Hindi Course ================================== https://www.youtube.com/playlist?list=PLOZ3jentlCDAxKpBLMWogxSdy6BZcsAJq Trips & Tricks Channel ====================== https://www.youtube.com/channel/UCGmLfkuCo-3lHHJXRJ9HUMw Programming in Hindi Channel ============================ https://www.youtube.com/channel/UCudElIDgwNrybeAvXIy1HZQ
Views: 16053 ITORIAN
SQL 18: Manipulation de Données: Modifications De Schémas 2
 
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SQL 18: Manipulation de Données: Modifications De Schémas ADD CONSTRAINT CHECK CONSTRAINT NOCHECK CONSTRAINT
Views: 177 E- Taalim
Transaction Recovery Procedure - Deferred Database Vs. Immediate Database Modification
 
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Transaction Recovery Procedure - Deferred Database vs. Immediate Database Modification For Students of B.Tech, B.E, MCA, BCA, B.Sc., M.Sc., Courses - As Per IP University Syllabus and Other Engineering Courses
SQL Server Constraint Operations
 
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Microsoft SQL Server Constraint Operations. Kompozit TV ! Kompozit Studios
Views: 39 Kompozit Tv
RTS_Total-Bandwidth-Server
 
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Limitations of Sporadic Server which has been solved by the approach of Total Bandwidth Server shown by live demo and graphical example using allegro lib in C++.
Views: 944 Manjari Misra
Sysdate Oracle - Sysdate SQL - Pseudo columns in Oracle - Pseudo Column - Pseudo columns in SQL
 
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Pseudo columns in oracle play an important role in providing some information from the system like rowid, rownum, sysdate and user account. The difference between rowid vs rownum has been explained with examples in this video. Sysdate function returns the current system date as on the serve while user pseudo column returns the name of the current user. #LearnSQL #OracleSQL #Crazy4DB #MunshiSir #PseudoColumns #BasicSQL Types of Subqueries : https://youtu.be/a69CaAru1aU Relational Algebra : https://youtu.be/wNaX1a5Kc48 A complete course on SQL : https://www.youtube.com/playlist?list=PLdNnjIwbbBta7tveno_un-C7VVFY-F24Z My web site : http://www.oracletrainingnagpur.com My blog : https://crazy4db.blogspot.in My facebook page : https://www.facebook.com/crazy4db/
Views: 132 Crazy4 DB
Normalization in DBMS : Normalization - Normalization in Database with Example - Normal Forms
 
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This video explains normalization 1nf 2nf 3nf with example. Database normalization is dune up to first normal form, second normal form and third normal form in the real time environment. The video also has explanation on bcnf normalization example. #dbmsforbeginners,#dbms, #crazy4db DBMS Keys Tutorial : https://youtu.be/DLrCop3-I2M SQL Tutorial Part 3 : https://youtu.be/y45AEBbvf_0 SQL Turotial Part 2 : https://youtu.be/cze26lOEYz8 SQL Tutorial Part 1 : https://youtu.be/vOvsI8nMD-c Codd's Rules : https://youtu.be/nb2RzcyVUZk DBMS Basics : https://youtu.be/YSowepMbzqk Facebook Page : https://www.facebook.com/crazy4db
Views: 1250 Crazy4 DB
SQL set operations - SQL set operators tutorial - Set operators in Oracle
 
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SQL set operations are the operations like UNION, MINUS and INTERSECT. This SQL set operators tutorial contains explanation of basic concepts with practical examples to demonstrate the use of set operators in Oracle. #LearnSQL #BasicSQL #Crazy4DB #MunshiSir #SQLBasics #SQLTutorial Watch following videos : Relational Algebra : https://youtu.be/wNaX1a5Kc48 Normalization tutorial : https://youtu.be/Y0mX6cy2r5U Complete SQL course : https://www.youtube.com/playlist?list=PLdNnjIwbbBta7tveno_un-C7VVFY-F24Z My web site : http://www.oracletrainingnagpur.com My blog : https://crazy4db.blogspot.in My facebook page : https://www.facebook.com/crazy4db/
Views: 109 Crazy4 DB
Lecture - 13 Constraints and Triggers
 
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Lecture Series on Database Management System by Dr.S.Srinath, IIIT Bangalore. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 49737 nptelhrd
Constraints in DBMS - Constraints in SQL - Integrity Constraints in DBMS - Constraints in Oracle
 
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This lesson defines complete yet brief about type of constraint in databases. This database constraints tutorial brings with example all the explanation with examples about data integrity constraints in DBMS. #IntegrityConstraints #LearnSQL #Crazy4DB #MunshiSir #DBMSTutorial #SQLBasics #SQLTutorial Try answering the test question, put your answers in the comments - (1)What is another name for foreign key constraint (2) What is the difference between primary key and unique constraint (3) Give an example of domain integrity constraint. DBMS Keys Tutorial : https://youtu.be/DLrCop3-I2M Integrity Constraint Part 2 Video : https://youtu.be/dLzuFmFiHxk Integrity Constraint Part 3 Video : https://youtu.be/l6C-gmIaswA Integrity Constraint Part 4 Video : https://youtu.be/5YxFJNqPPAM My web site : http://www.oracletrainingnagpur.com My blog : https://crazy4db.blogspot.in My facebook page : https://www.facebook.com/crazy4db/
Views: 364 Crazy4 DB
Most important SQL queries asked in interview - Tricky SQL queries for interview
 
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This video brings most important SQL queries asked in interview. The tricky SQL queries have been explained with rich examples and explanations. The queries contain nth highest sql query example, cumulative sum, connect by prior hierarchical queries with also examples of use of correlated queries in update and delete SQL statements. #SQLQueries #SQL #Crazy4db #MunshiSir #LearnSQL #BasicSQL #OracleSQL Types of subqueries : https://youtu.be/a69CaAru1aU SQL Decode and CASE : https://youtu.be/-TK-7oI59DE Group functions SUM, AVG, COUNT : https://youtu.be/fx4EnMdyTOM SQL Distinct operator : https://youtu.be/cze26lOEYz8 My web site : http://www.oracletrainingnagpur.com My blog : https://crazy4db.blogspot.in My facebook page : https://www.facebook.com/crazy4db/
Views: 205 Crazy4 DB
How to create table in SQL - SQL create table - SQL alter table - SQL drop table
 
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This video teaches you how to create table in SQL databases or SQL alter table command used for modifying the structure of the table. SQL drop table command is used for dropping a table. All the commands have been demonstrated with Oracle SQL. #LearnSQL #BasicSQL #Crazy4db #MunshiSir Interview Questions : (1) Which are the two methods to create a table in SQL? (2) How to create a table from another table without importing any data from it? (3) What are the restrictions of modifying the data type of a column? Videos you must visit :- Types of constraints : https://youtu.be/MaZIN_MVFY8 How to create constraints : https://youtu.be/dLzuFmFiHxk How to create FK constraint : https://youtu.be/l6C-gmIaswA Lesson of DBMS Keys : https://youtu.be/DLrCop3-I2M A complete course on SQL : https://www.youtube.com/playlist?list=PLdNnjIwbbBta7tveno_un-C7VVFY-F24Z
Views: 82 Crazy4 DB
Part 4   Customizing table, column and foreign key column names when using entity framework code fir
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-4-customizing-table-column-and.html Slides http://csharp-video-tutorials.blogspot.com/2014/05/part-4-customizing-table-column-and_7.html Entity Framework - All Text Articles http://csharp-video-tutorials.blogspot.com/2014/05/entity-framework-tutorial.html Entity Framework - All Slides http://csharp-video-tutorials.blogspot.com/2014/05/entity-framework-tutorial-slides.html Entity Framework Playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhUPBSX-E2aJCnCR3-_6zBZx Dot Net, SQL, Angular, JavaScript, jQuery and Bootstrap complete courses https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd In this vide we will discuss, customizing table, column and foreign key column names when using entity framework code first approach. This is continuation to Part 3. Please watch Part 3 before proceeding. In Part 3, we have discussed generating Departments and Employees tables using Entity Framework Code first approach. Entity Framework generated the Employees table. Notice the column names. Department_Id column has an underscore in it's name. Let's say we want the column to be generated as DepartmenId (without an underscore) Entity Framework generated the above Employees table based on the following custom Employee class that we created. public class Employee { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public string Gender { get; set; } public int Salary { get; set; } public Department Department { get; set; } } To achieve this use the ForeignKey attribute present in System.ComponentModel.DataAnnotations.Schema namespace. Modify the Employee class as shown below. public class Employee { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public string Gender { get; set; } public int Salary { get; set; } public int DepartmentId { get; set; } [ForeignKey("DepartmentId")] public Department Department { get; set; } } Rebuild the solution, and run the application. You may get the following error. We will discuss the reasons for this error and how to fix it the right way in a later video session. The model backing the 'EmployeeDBContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269). For now to get around the error, delete the Sample database using SQL Server Management Studio, and then try to run the application again. A blank webform will be displayed. Now check the Employees tables using SQL Server Management Studio and notice that the DepartmentId column is created without an underscore as expected. To customize the table name, use Table attribute and to customize column name use Column attribute. For example, to change Table name from Employees to tblEmployees and FirstName column to First_Name We would modify the Employee class as shown below. [Table("tblEmployees")] public class Employee { public int Id { get; set; } [Column("First_Name")] public string FirstName { get; set; } public string LastName { get; set; } public string Gender { get; set; } public int Salary { get; set; } public int DepartmentId { get; set; } [ForeignKey("DepartmentId")] public Department Department { get; set; } }
Views: 143953 kudvenkat