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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: 1518 Oracleadda
Using DEFERRED Constraints in Oracle/ arabic
 
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Using DEFERRED Constraints in Oracle/ arabic maxvlearn.com
Views: 306 khaled alkhudari
Oracle Tutorial || Oracle| Sql Constraints Part - 1 by basha
 
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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: 17744 Caleb Curry
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: 1029 khaled alkhudari
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: 14447 ITORIAN
SQL Server Constraint Operations
 
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Microsoft SQL Server Constraint Operations. Kompozit TV ! Kompozit Studios
Views: 34 Kompozit Tv
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: 49170 nptelhrd
Part 4   Customizing table, column and foreign key column names when using entity framework code fir
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-4-customizing-table-column-and.html 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: 127320 kudvenkat

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