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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=1) 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. 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...
Problem: Find the output of the SQL query SELECT Y FROM T WHERE X=7 after a series of insertions in the table T.

Solution:

  • Initially, one record with X=1 and Y=1 is inserted in the table T.

  • Let MX and MY denote the maximum values of X and Y among all records in the table at any point in time.

  • After the first insertion, MX=1 and MY=1.

  • For the next insertion, X=MX+1=2 and Y=2*MY=2.

  • After the second insertion, MX=2 and MY=2.

  • Similarly, for the third insertion, X=MX+1=3 and Y=2*MY=4.

  • After the third insertion, MX=3 and MY=4.

  • This process continues for 128 insertions.

  • After 128 insertions, MX=129 and MY=2^128.

  • Now, we need to find the value of Y when X=7.

  • Since there is no record in the table T with X=7, the query will return an empty result set.

  • Hence, the output of the SQL query SELECT Y FROM T WHERE X=7 is 127.



Answer: Option (a) 127.
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Community Answer
Consider a database table T containing two columns X and Y each of typ...
127
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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=1) 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. 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=1) 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. 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 Current Affairs 2024 is part of Current Affairs preparation. The Question and answers have been prepared according to the Current Affairs 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=1) 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. 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 Current Affairs 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=1) 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. 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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