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how to eliminate duplicate records in sql

how to eliminate duplicate records in sql

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SQL statement used to obtain the first n records of each group after grouping in oracle: rownumber () over ()

The SQL statement for the first n records of each group after grouping in oracle: rownumber () over () row_number () OVER (PARTITION BY COL1 ORDER BY COL2) indicates grouping BY COL1, sort by COL2 in the group, and the value calculated by this function indicates the sequential number after sorting in each group (the continuous and unique in the group ). the difference between rownum and rownum is that when

SQL Server records a field with the same field value. How can this problem be solved?

I. Problems The table is as follows: Obtain the following results: Ii. solution 1 Use XML Conversion The Code is as follows: Create Table body (ID int, body nvarchar (20) goinsert into body values (1, 'aaa') insert into body values (2, 'bbbbb ') insert into body values (1, 'cccccccc') insert into body values (3, 'ddddd ') goselect * From bodyselect distinct. ID, stuff (select ',' + body from body where id =. ID for XML Path (''),'') as bodyfrombody a -- the specific idea is as follows: Select

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