sql server - SQL is it possible to use AND/OR with HAVING clause -


so have these tables: 

products -------- product id | quantity

and

orderslines  ----------- product id | amount --(multiple lines same id)

i'm using select:

 select   p.productid,  p.quantity,  sum(ol.amount) ordered  atbl_sales_products p  inner join atbl_sales_orderslines ol on ol.productid = p.productid  group p.productid, p.quantity  having p.quantity > sum(ol.amount)

the select works if productid used in both tables. however, if productid not used in orderslines table or amount in table null - such rows not included.

when want join across tables need include records 1 side of join or other, need use 1 of outer joins opposed inner join in sql. if want include record atbl_sales_products when there may no matching record in atbl_sales_orderlines same productid should use left join.

as mentioned in comments can use operators use in where clause having clause.


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