CBSE Class 12 Multimedia And Web Technology MySql Worksheet

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MySql Multimedia And Web Technology Worksheet for Class 12

Class 12 Multimedia And Web Technology students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Multimedia And Web Technology will be very useful for tests and exams and help you to score better marks

Class 12 Multimedia And Web Technology MySql Worksheet Pdf

Mysql/ms- access

Types of Table Relationships
 
A relationship works by matching data in key columns — usually columns with the same name in both tables. In most cases, the relationship matches the primary key from one table, which provides a unique identifier for each row, with an entry in the foreign key in the other table. For example, book sales can be associated with the specific titles sold by creating a relationship between the title_id column in the titles table (the primary key) and the title_id column in the sales table (the foreign key).
 
There are three types of relationships between tables. The type of relationship that is created depends on how the related columns are defined.
• One-to-Many Relationship
• Many-to-Many Relationships
• One-to-One Relationships
 
One-to-Many Relationships
 
A one-to-many relationship is the most common type of relationship. In this type of relationship, a row in table A can have many matching rows in table B, but a row in table B can have only one matching row in table A. For example, the publishers and titles tables have a one-to-many relationship: each publisher produces many titles, but each title comes from only one publisher. Make a one-to-many relationship if only one of the related columns is a primary key or has a unique constraint.
 
The primary key side of a one-to-many relationship is denoted by a key symbol. The foreign key side of a relationship is denoted by an infinity symbol.
 
Many-to-Many Relationships
 
In a many-to-many relationship, a row in table A can have many matching rows in table B, and vice versa. You create such a relationship by defining a third table, called a junction table, whose primary key consists of the foreign keys from both table A and table B. For example, the authors table and the titles table have a many-to-many relationship that is defined by a one-to-many relationship from each of these tables to the titleauthors table. The primary key of the
titleauthors table is the combination of the au_id column (the authors table's primary key) and the title_id column (the titles table's primary key).
 
One-to-One Relationships
 
In a one-to-one relationship, a row in table A can have no more than one matching row in table B, and vice versa. A one-to-one relationship is created if both of the related columns are primary keys or have unique constraints.
 
This type of relationship is not common because most information related in this way would be all in one table. You might use a one-to-one relationship to:
 
• Divide a table with many columns.
• Isolate part of a table for security reasons.
• Store data that is short-lived and could be easily deleted by simply deleting the table.
• Store information that applies only to a subset of the main table.
 
The primary key side of a one-to-one relationship is denoted by a key symbol. The foreign key side is also denoted by a key symbol.
 
Referential Integrity
 
Referential integrity (RI) is a relational database concept, which states that table relationships must always be consistent. In other words, any foreign key field must agree with the primary key that is referenced by the foreign key. Thus, any primary key field changes must be applied to all foreign keys, or not at all. The same restriction also applies to foreign keys in that any updates (but not necessarily deletions) must be propagated to the primary parent key.

CBSE Class 12 Multimedia And Web Technology MySql Worksheet 1


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MySql CBSE Class 12 Multimedia And Web Technology Worksheet

The above practice worksheet for MySql has been designed as per the current syllabus for Class 12 Multimedia And Web Technology released by CBSE. Students studying in Class 12 can easily download in Pdf format and practice the questions and answers given in the above practice worksheet for Class 12 Multimedia And Web Technology on a daily basis. All the latest practice worksheets with solutions have been developed for Multimedia And Web Technology by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their examinations. Studiestoday is the best portal for Printable Worksheets for Class 12 Multimedia And Web Technology students to get all the latest study material free of cost. Teachers of studiestoday have referred to the NCERT book for Class 12 Multimedia And Web Technology to develop the Multimedia And Web Technology Class 12 worksheet. After solving the questions given in the practice sheet which have been developed as per the latest course books also refer to the NCERT solutions for Class 12 Multimedia And Web Technology designed by our teachers. After solving these you should also refer to Class 12 Multimedia And Web Technology MCQ Test for the same chapter. We have also provided a lot of other Worksheets for Class 12 Multimedia And Web Technology which you can use to further make yourself better in Multimedia And Web Technology .

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