SQL Server selects a tuple of row m to nth row

Source: Internet
Author: User

Now there is a table Questioin, the main code is QID, which requires the selection of the tuple of row m to nth row

Method One: Lowest efficiency

Error: If n<m, the first n data will be selected, and if N>=m, n data starting from M+1 will be selected

Select Top *  from Question where  not inch {selecttop  m qid from Question}

Of course, it's the right thing to change.

Select Top (n-m) *  from  wherenot in(Selecttop from Question )

Method Two: Sorting first, said to be the most efficient

Select Top *  from (Selecttop*fromorderbyASC) A  orderbydesc

Method Three: Use the Row_number function to set the tuple number (recommended)

SELECT *  from (SELECTover (ORDER by as RowIndex,* from Question) bWHERE b.rowindex>= and B.rowindex<=N

SQL Server selects a tuple of row m to nth row

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.