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Describe the two alternatives for specifying structural constraints on relationship kinds?
Relationship kinds have certain constraints in which limit the possible combination of entities that might participate in relationship. An example of a constraint is in which if we have the entities Doctor and Patient, the organization might have a rule that a patient cannot be seen through more than one doctor. This constraint needs to be elaborates in the schema. There are two major kinds of structural relationship constraints on: cardinality ratio, and participation.
Explain the three data models namely relational, network and hierarchical and evaluate their relative advantages and disadvantages. Hierarchical Model: In hierarchical model, da
What are the kinds of Strings? -A binary string in MySQL is one that MySQL treats as case sensitive in comparisons. -A non binary string in MySQL is one that MySQL does'nt
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
Problem: (a) Data mining is one of the best ways to analyse data and using software techniques, hidden and unexpected patterns and relationships in sets of data can be extrac
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
Heap files (unordered file) Mostly these files are unordered files. It is the easiest and most basic type. These files having of randomly ordered records. The records will have
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Define reference file
Consider the relations EMP(ENO,ENAME,AGE,BASIC_SALARY) WORK_IN(ENO,DNO) DEPT(DNO,DNAME,CITY) Express the following queries in SQL (i) Find names of employees who work in a dep
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