20 Sep 19 ·  nVector in Bigquery ·        Bookmark ·  Report ·  More actions.. Lock comments ·  Pin thread

ROW_NUMBER() OVER PARTITON BY Syntax in Bigquery

Use the ROW_NUMBER() over analytic functions to Calculate ROW_NUMBER. Analytic functions are evaluated after aggregation (GROUP BY and non-analytic aggregate functions)

The following query finds the early employee in each department:

SELECT firstname, department, startdate,
ROW_NUMBER() OVER ( PARTITION BY department ORDER BY startdate ) AS rank
FROM Employees;

you can extend this query to only see the top users,

Select A.* from (
SELECT firstname, department, startdate,
ROW_NUMBER() OVER ( PARTITION BY department ORDER BY startdate ) AS rownum
FROM Employees)A where A.rownum=1;

nVector

posted on 20 Sep 19

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Gustavo19-Apr-20

Did "where rownum=1;" work?

I tried it and it did not recognize the rownum as a colum

nVector19-Apr-20

Good catch! you will need a derived table for it to work

Fixed the article to reflect the correct syntax