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ER‐model. Relational model:Relational algebra, Tuple calculus, SQL. Integrity constraints, Normal forms. File organization, Indexing (e.g., B and B+ trees). Transactions and concurrency control.

$$\scriptsize{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}& \textbf{2022} & \textbf{2021-1}&\textbf{2021-2}&\textbf{2020}&\textbf{2019}&\textbf{2018}&\textbf{2017-1}&\textbf{2017-2}&\textbf{2016-1}&\textbf{2016-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count} & 3 &2&1&2&2&2&2&2&3&2&1&2.1&3
\\\hline\textbf{2 Marks Count} & 2&3&3&3&3&2&3&3&1&2&1&2.5&3
\\\hline\textbf{Total Marks} & 7 &8&7&8&8&6&8&8&5&6&\bf{6}&\bf{7.1}&\bf{8}\\\hline
\end{array}}}$$

Questions without answers in Databases

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5
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8
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12
r=(a1,a2,a3,...a8) assumne that a1a2a3 is a canidate key and other cks we dont know.Then find the number of possible candidate keys and number of superkeys?
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13
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16
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17
If in a relationship an entity totally participates, and if it contains a foreign key then the foreign key can not be null in relation table format?
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19
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20
How can I represent the ER model in tabular form? , in java point, the tabular form doesn't seem to be correct.Ref. https://www.javatpoint.com/dbms-reduction-of-er-diagra...
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23
Can someone please provide me with the correct explanation for this question
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28
Show that the two phase locking protocol ensures conflict serializability and that transaction can be serialized according to their lock points.
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29
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