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How to write query using GROUP BY ? RRS feed

  • Question

  • Hi all,

    I wanna write a sql query like this

    select * from table_name group by number

    but it shows me an error ... I wanna prevent to show dupliucate rows so where is a same number in one column, it should shows only one row ... but this doesnt work ... no idea what to do

    or if this is wrong ... what else? ...

    thanks

    Wednesday, June 1, 2016 6:40 AM

Answers

All replies

  • In Access to avoid duplicates you would use

    SELECT DISTINCT[ROW] * FROM table_name;

    The GROUP BY clauses requires a "fixed" column list in the SELECT, which may only consist of the columns in the GROUP BY and aggregated columns (AVG, MIN, MAX, etc.):

    SELECT group_by_columns, aggregated_columns FROM table_name GROUP by group_by_columns;

    So using the asterisk in the SELECT when having a GROUP BY is an error.

    But: Having duplicates is either result of a data model error or a data error. Both should be corrected before using DISTINCT.

    Wednesday, June 1, 2016 7:42 AM
  • select number, field1 , field1 from table

    group by number, field1 , field1

    Wednesday, June 1, 2016 8:23 AM
  • I used

    Select DISTINCT(number), name from TABLE_NAME ORDER BY number DESC;

    It shows me result ... but with duplicate rows ... I mean two rows had same number ...

    Wednesday, June 1, 2016 8:49 AM
  • I don't have said anything about DISTINCT(column).

    It's

    SELECT DISTINCT[ROW]
        column_list
    FROM table_name;

    Wednesday, June 1, 2016 1:30 PM
  • Hi TakeshiKitano,

    Hope you have get your solution from suggestion given by the Stefan Hoffmann.

    Here I provided some links to you which will clear the idea regarding Distinct, Distinct Row, Gropup By Clause.

    GROUP BY Clause

    Difference Between "Unique Values" (SELECT DISTINCT) and "Unique Records" (SELECT DISTINCTROW) in Microsoft Access Queries

    GROUP BY Clause (Microsoft Access SQL)

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    Regards

    Deepak 


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    Thursday, June 2, 2016 12:30 AM
    Moderator