The ROW_NUMBER () OVER function is used to assign a row number to each record in the SQL database. row_numbersql

Source: Internet
Author: User

The ROW_NUMBER () OVER function is used to assign a row number to each record in the SQL database. row_numbersql

Since SQL Server 2005, a new function Row_Number () has been added. Its great function is to add a row number starting from 1 to a data table, this greatly replaces all redundant code to generate row numbers. The following describes how to use the Row_Number () function.

Assume that the database has the following table:

Copy codeThe Code is as follows:
Id name
1 aa
3 bb
4 cc

After the following SQL statement is executed, the result is as follows:

SELECT ROW_NUMBER () OVER (order by id) as rowNum, * FROM Table Name

Copy codeThe Code is as follows:
RowNum id name
1 1 aa
2 3 bb
3 4 cc

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