List, I'm creating this multi company POS database. My inventory table looks like (all items are unique):
id,category_id,invoice_id,x,y,z,gid,uid I have a primary key on id, and then an foreign keys on category_id and invoice_id. GID is the group ID of the company, UID is the companies user, they are also connected via foreign key to the respective tables. My question is this: Do I need to create more indexes on this table when inventory selects look like select * from inventory where category_id = 1 and invoice_id is null and gid = 2 So where would the indexes need to be placed? Or since I have the FK setup are the indexes already in place? I expect to soon have >500K items in the inventory table and don't want it to slow down. I'll have the same type of issue with clients, invoices, purchase_orders and perhaps more Ideas? Thanks! David Busby Systems Engineer ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match