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What is NULL? Give an example to described testing for NULL in SQL?
The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:
Person(id, name, address, phone)Now to search ids and names of person who do not have a phone is: Select id, name from Person where phone is null
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
Question: (a) What are decision support systems, and what role do they play in the business environment? (b) Data mining is a knowledge discovery process of automated extr
What is Thread splitting A thread of control is a path by which a set of state diagrams on that a single object is active at a time. Objects are shared between threads
anyone have a textbook solutions case fair, 8 edition of vol 1 ?, please give me
Explain the differences between structured data and unstructured data. Structured data are facts concerning objects and events. The most significant structured data are numeric
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
1. Determine that the Checkpoints are a part of Ans: Checkpoints are a part of Recovery measures
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
difference between internal schema and external schema in DBMS
#quCreate a database design specification (Enhanced Entity Relationship Diagram (EERD) and Relational Data Model (RDM)) from the given business description. The RDM must be in 3rd
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