我有一个与此类似的查询，其中从多个表中检索数据。问题是如果该表要检索多个数据…使用嵌套的select或temp的过程肯定会更好或更有效。表格以优化我的选择语句…以及如何对联接进行分组…

 Select a.Name,
    b.type,
    c.color,
    d.group,
    e.location
    f.quantity
    g.cost
from Table1 a 
INNER JOIN Table2 b ON a.ID=b.ItemCode
INNER JOIN TABLE3 c ON b.ItemCOde = c.groupID
INNER JOIN TABLE4 d ON c.groupID  = d.batchID
LEFT JOIN TABLE5 e ON d.batchID = e.PostalID
LEFT JOIN TABLE6 f ON e.PostalID = f.CountID
LEFT JOIN TABLE7 g ON f.CountID = g.InventoryNo