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Diffrence between is selected and set …

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Diffrence between is selected and set selected

    • Posted by Piyush Kumar 7 years, 3 months ago

    CBSE > Class 12 > Informatics Practices
    • 1 answers

    Naveen Sharma 7 years, 3 months ago

    Depending on the scenario you may want to use both SET or SELECT.

    Following are few scenarios for using SET

    • If you are required to assign a single value directly to variable and no query is involved to fetch value
    • NULL assignments are expected (NULL returned in result set)
    • Standards are meant to be follow for any planned migration
    • Non scalar results are expected and are required to be handled

      Using SELECT is efficient and flexible in the following few cases.
    • Multiple variables are being populated by assigning values directly
    • Multiple variables are being populated by single source (table , view)
    • Less coding for assigning multiple variables
    • Use this if you need to get @@ROWCOUNT and @ERROR for last statement executed

    0Thank You

    ANSWER
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    Posted by Honey Hanisha 9 months, 3 weeks ago

    CBSE > Class 12 > Informatics Practices
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    Consider the SchoolBus table given below: Rtno. Area_covered. Capacity. No of students. Distance. Transporter. Charges 1. Vasantkunj 100 120 10 Shivamtravels 100000 2. HauzKhas 80 80 10 Anand travels 85000 3. Pitampura 60 55 30 Anand travels 60000 4. Rohini 100 90 35 Anand travels 100000 5. Yamuna Vihar 50 60 20 Bhalla Co. 58000 6. Krishna Nagar 70 80 30 Yadav Co. 80000 7. Vasundhara 100 110 20 Yadav Co. 100000 8. PaschimVihar 40 40 20 Speed travels 55000 (i) State the command that will give the output as : Area_covered Yamuna Vihar Krishna Nagar Vasundhara (ii) State the command to display the records of SchoolBus where distance is 20 according to their charges. (iii) State the command to display the total capacity Transporter wise. (iv) State the command to increase the charges by 20% where distance is more than 20. (v) State the command to display those records whose capacity is greater than 60 and charges between 80000 to 100000. (vi) State the command to delete the records of Rtno 6,7 and 8. (vii)State the command to display those records where charges greater than the average charges.

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