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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.
A well-maintained relational DBMS has a high level of data integrity. What features of a relational DBMS contribute towards this level of integrity? Relational DBMS gives high
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Which is a valid SQL type? A valid SQL Should be in CHARACTER it is should be NUMERIC and FLOAT.
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
Describe logical data independence ? Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application p
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What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
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