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Differance between DDL and SDL?
DDL and SDL - The data definition language (DDL) is used through DBA and database designers to describe internal schema, conceptual schema, and mappings between these two. In a few DBMSs, a clear separation is maintained among conceptual schema and internal schema. In that case, DDL is used to exact the conceptual schema only. The other language, storage definition language (SDL) is used to specify the internal schema. The mappings among the two schemas may be specified in either one of these languages.
Deletion Anomalies: Loss of important Information: In some cases, useful information may be lost when a tuple is deleted. For instance, if we delete the tuple corresponding to stu
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
a project based on normalization with first, second and third normalization. There need to be a diagram also
Outer Join: The use of Outer Join is that it still joins those tuples that do not have matching values in common columns are also contained in the result table. Outer join places
Consider the 1ollowin8 relation: CAR SALE (Car_id, Option_type, Option_listprice, Sale_date, Option_discountedprice) This relation refers to options installed in cars (e.g., crui
I need a help with my assignment of data envelopment analysis which is due for submission next week on monday the 10th Dec. Will you be able to help so that I can submit it on tim
Use Access 2007 to create a database called UniLib.mdb. - this file should be created on your personal drive at the university (or C: if you're using Access 2007 at home) and t
What is meant by data-transfer rate? The data-transfer rate is the rate at which data can be retrieved from or kept to the disk.
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
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