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DBMS Questions
81. The CREATE TRIGGER statement is used to create the trigger. THE _____ clause specifies the table name on which the trigger is to be attached. The ______ specifies that this is an AFTER INSERT trigger.
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Correct Ans:On, for insert
Explanation:
The triggers run after an insert, update or delete on a table. They are not supported for views.
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82. Which of the following is used at the end of the view to reject the tuples which do not satisfy the condition in where clause ?
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Correct Ans:With check
Explanation:
Views can be defined with a with check option clause at the end of the view definition; then, if a tuple inserted into the view does not satisfy the view’s where clause condition, the insertion is rejected by the database system.
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83. SQL view is said to be updatable (that is, inserts, updates or deletes can be applied on the view) if which of the following conditions are satisfied by the query defining the view?
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Correct Ans:All of the mentioned
Explanation:
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84. Which of the following is the syntax for views where v is view name ?
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Correct Ans:Create view v as “query expression”;
Explanation:
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85. For select operation the ________ appear in the subscript and the ___________ argument appears in the parenthesis after the sigma.
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Correct Ans:Predicates, relation
Explanation:
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86. The ____ connective tests for set membership, where the set is a collection of values produced by a select clause. The ____ connective tests for the absence of set membership.
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Correct Ans:In, not in
Explanation:
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87. Select count (____ ID)
from teaches
where semester = 'summer' and year = 2017;
If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.
from teaches
where semester = 'summer' and year = 2017;
If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.
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Correct Ans:Distinct
Explanation:
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88. In the two-tier architecture, the server is considered as
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Correct Ans:transaction server
Explanation:
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89. In DBMS, the description of database in the form of schema is also called
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Correct Ans:intention of schema
Explanation:
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90. In hierarchical structures, the can be nested to create
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Correct Ans:simple data structures
Explanation:
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91. The program interface which provides the feature to client side programs to call the database management system is classified as
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Correct Ans:application programming interface
Explanation:
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92. The graphical representation of database description is called
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Correct Ans:schema diagram
Explanation:
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93. The types of architectures of DBMS are
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Correct Ans:both b and c
Explanation:
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94. The type of data independence in which the internal schema can be modified without modifying the conceptual schema is classified as
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Correct Ans:physical data independence
Explanation:
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95. If the commands of data manipulation language are embedded in general programming language then that programming language is called
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Correct Ans:host language
Explanation:
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96. If there are no strict separation between internal and conceptual levels, the language used by database designer is
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Correct Ans:data definition language
Explanation:
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97. The complete description of database which is described in design phase and is changed rarely is called
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Correct Ans:schema
Explanation:
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98. In Three-Schema Architecture, the schema which gives details about data types, constraints and entities is classified as
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Correct Ans:conceptual schema
Explanation:
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99. The hierarchical models and network models are classified as
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Correct Ans:legacy data models
Explanation:
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100. The system which schedules the inputs or outputs of the disk in database is classified as
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Correct Ans:operating system
Explanation:
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