80、View the exhibit and examine the structure in ORDERS and ORDER_ITEMS tables.You need to create a view that displays the ORDER_ID, ORDER_DATE, and the total number of items in each order.Which CREATE VIEW statement would create the views successfully?A . AS SELECT o.order_id, o....【阅读全文】
Detailed requirements on small jaw crusher Raw materials: Andesite, basaltMaximum input size:300-400 mm Small jaw crusher capacity:60-80 t/h Output size range:0-20 mm, 20-40mmDestination port: Harare Port,ZimbabweApplication:Railway and highway construct...【阅读全文】