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Consider a database table T containing two columns X and Y each of type integer. After the creation of the table, one record (X= 1, Y=l) is inserted in the table.
Let MX and MY denote the respective maximum values of X and Y among all records in the table at any point in time. Using MX and MY, new records are inserted in the table 128 times with X and Y values being MX+1, 2*MY+1 respectively. It may be noted that each time after the insertion, values of MX and MY change.
 
Q. What will be the output of the following SQL query after the steps mentioned above are carried out?
SELECT Y FROM T WHERE X=7;
  • a)
    127
  • b)
    255
  • c)
    129
  • d)
    257
Correct answer is option 'A'. Can you explain this answer?
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Consider a database table T containing two columns X and Y each of typ...
The initial record inserted in the table T has X=1 and Y=1.

At any point in time, the maximum value of X (MX) and the maximum value of Y (MY) among all the records in the table can be determined.

After the initial record is inserted, MX=1 and MY=1.

Then, new records are inserted 128 times in the table using MX and 2*MY as the values for X and Y respectively.

This means that the value of X for each new record is equal to the current maximum value of X in the table, and the value of Y for each new record is equal to twice the current maximum value of Y in the table.

Let's go through the steps of inserting new records and updating MX and MY:

1. Insert record with X=MX=1 and Y=2*MY=2.
- MX remains 1 (as 1 is still the maximum value of X in the table).
- MY becomes 2 (as 2 is the maximum value of Y in the table).

2. Insert record with X=MX=1 and Y=2*MY=4.
- MX remains 1.
- MY becomes 4.

3. Insert record with X=MX=1 and Y=2*MY=8.
- MX remains 1.
- MY becomes 8.

4. Insert record with X=MX=1 and Y=2*MY=16.
- MX remains 1.
- MY becomes 16.

...

128. Insert record with X=MX=1 and Y=2*MY=2^128.
- MX remains 1.
- MY becomes 2^128.

After the above steps, we can see that MX remains 1 throughout the process, and MY becomes 2^128.

Now, let's consider the SQL query: SELECT Y FROM T WHERE X=7.

Since the maximum value of X in the table at any point in time is 1, there won't be any record in the table where X=7.

Therefore, the query will not return any result, and the output will be an empty set.
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Consider a database table T containing two columns X and Y each of type integer. After the creation of the table, one record (X= 1, Y=l) is inserted in the table.Let MX and MY denote the respective maximum values of X and Y among all records in the table at any point in time. Using MX and MY, new records are inserted in the table 128 times with X and Y values being MX+1, 2*MY+1 respectively. It may be noted that each time after the insertion, values of MX and MY change.Q.What will be the output of the following SQL query after the steps mentioned above are carried out?SELECT Y FROM T WHERE X=7;a)127b)255c)129d)257Correct answer is option 'A'. Can you explain this answer?
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Consider a database table T containing two columns X and Y each of type integer. After the creation of the table, one record (X= 1, Y=l) is inserted in the table.Let MX and MY denote the respective maximum values of X and Y among all records in the table at any point in time. Using MX and MY, new records are inserted in the table 128 times with X and Y values being MX+1, 2*MY+1 respectively. It may be noted that each time after the insertion, values of MX and MY change.Q.What will be the output of the following SQL query after the steps mentioned above are carried out?SELECT Y FROM T WHERE X=7;a)127b)255c)129d)257Correct answer is option 'A'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider a database table T containing two columns X and Y each of type integer. After the creation of the table, one record (X= 1, Y=l) is inserted in the table.Let MX and MY denote the respective maximum values of X and Y among all records in the table at any point in time. Using MX and MY, new records are inserted in the table 128 times with X and Y values being MX+1, 2*MY+1 respectively. It may be noted that each time after the insertion, values of MX and MY change.Q.What will be the output of the following SQL query after the steps mentioned above are carried out?SELECT Y FROM T WHERE X=7;a)127b)255c)129d)257Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a database table T containing two columns X and Y each of type integer. After the creation of the table, one record (X= 1, Y=l) is inserted in the table.Let MX and MY denote the respective maximum values of X and Y among all records in the table at any point in time. Using MX and MY, new records are inserted in the table 128 times with X and Y values being MX+1, 2*MY+1 respectively. It may be noted that each time after the insertion, values of MX and MY change.Q.What will be the output of the following SQL query after the steps mentioned above are carried out?SELECT Y FROM T WHERE X=7;a)127b)255c)129d)257Correct answer is option 'A'. Can you explain this answer?.
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