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Define the following constraints for the table client.
(i) BAL_DUE must be at least 1000.(ii) NAME is a unique key.
(i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1 CHECK(BAL_DUE < 1000); (ii) ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_NAME_U UNIQUE(NAME);
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
Attributes and its types explain?
Inheritance Adjustment As in object oriented analysis and design terms inheritance defines a relationship between classes, where as one class shares structure or behaviour def
Examine about the Behavioural Diagrams The main objective of behavioural diagrams is to visualize, specify, construct and document dynamic aspects of a system. The interactio
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
Differentiate between Primary and secondary storage? Primary and secondary storage - Primary storage device stores the data temporarily. Primary storage is commonly used thro
What do you mean by atomicity and aggregation? Atomicity : Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete trans
Serialisability: Any schedule that makes the similar results as a serial schedule is known as a serialisable schedule. But how can a schedule are determined to be serialisable or n
What is difference among mysql_connect and mysql_pconnect? Mysql_connect() opens a new connection to the database while mysql_pconnect() opens persistent connection to the data
What is known as sequential file organization? In the sequential file organization, the records are kept in sequential order, according to the value of a "search key" of every
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