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In which form of relational database developer refers to a record?In a tuple form of relational database developer refers to a record.
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
Define lock? Lock is the most common used to execute the requirement is to permit a transaction to access a data item only if it is currently holding a lock on that item.
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Problem 1 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples 2 Explain the following performance tuning techn
How can you map NULL values to other values while display? IF( ) , IFNULL( ) keywords are used to do so. They are 'LIMIT' is used for the following kinds of problems: 1) Ans
What are the three types of data sources used with ODBC? An ODBC file data source is a file that can be shared between database users. An ODBC system data source is one that is
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
What are deadlocks? How can they be avoided? Ans: Deadlock considers to a particular condition when two or more processes are every waiting for another to release a resource,
What does the cardinality ratio specify? Mapping cardinalities or cardinality ratios state the number of entities to which another entity can be associated. Mapping cardinaliti
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
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