sql server - SQL INNER JOIN - Column name in join is also in select *error* -


i'm still pretty new sql , having issues. using variation of classic northwind database. using microsoft sql server management studio.

here problem:

/* join products , productvendors display product, product number, average wholesale price, , average retail price. */

here's i've got:

select products.productnumber [product number],        cast(avg(wholesaleprice) decimal (8,2)) [average wholesale price],        cast(avg(retailprice) decimal (8,2))  [average retail price] products inner join productvendors         on products.productnumber = productvendors.productnumber

here's error get:

msg 8120, level 16, state 1, line 2
column 'products.productnumber' invalid in select list because not contained in either aggregate function or group clause.

exception text self-explanatory. since you're using aggregate functions (avg in case) have group products.productnumber too.

select products.productnumber aa [product number],        cast(avg(wholesaleprice) decimal (8,2)) [average wholesale price],        cast(avg(retailprice) decimal (8,2))  [average retail price] products inner join productvendors      on products.productnumber = productvendors.productnumber group products.productnumber

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