how to make inner join in this query

Question

I'm in trouble when making this inner join query

Original:

SELECT *
FROM (
    SELECT *, row_number() OVER (PARTITION BY idmicro ORDER BY IdHistMov desc) AS rownum
    FROM dbo.T_HistMovEquip
    ) AS initialResultSet
WHERE initialResultSet.rownum<=2

Trying to inner join:

SELECT *
FROM (
    SELECT *, row_number() OVER (PARTITION BY c.idmicro ORDER BY c.IdHistMov desc) AS rownum
    FROM dbo.T_HistMovEquip c
    INNER JOIN T_Micro m ON c.Idmicro=m.Idmicro
    ) AS initialResultSet
WHERE initialResultSet.rownum<=2

this error appears: The column 'IDMicro' was specified multiple times for 'initialResultSet'.

Thank You!

Answer 1

Why do you not just specify the columns you want. Like this:

SELECT *
FROM (
    SELECT 
        c.idmicro, 
        c.IdHistMov,
        /*And so on*/
        row_number() OVER (PARTITION BY c.idmicro ORDER BY c.IdHistMov desc) AS rownum
    FROM 
        dbo.T_HistMovEquip c
        INNER JOIN T_Micro m 
            ON c.Idmicro=m.Idmicro
    ) AS initialResultSet
WHERE initialResultSet.rownum<=2

Answer 2

That's because your using Select * when clearly you have the same column name ( IDMicro ) in both tables. Try to "filter" the output selection to only the columns you are interested in OR use column aliases if you need the same column names from both tables.