小编And*_*rei的帖子

我正在尝试优化一个与此类似的查询：

select top(1)
    t1.Table1ID,
    t1.Column1,
    t1....
    ....
    t2.Table2ID,
    t2....
    ....
    c.FirstName,
    c.LastName,
    c....
from BigTable1 t1
join BigTable2 t2
    on t1.Table1ID = t2.Table1ID
join Customer c
    on t2.CustomerID = c.CustomerID
join Table4 t4
    on t4.Table4ID = t2.Table4ID
join Table5 t5
    on t5.Table5ID = t1.Table5ID
join Table6 t6
    on t6.Table6ID = t5.Table6ID
where 
    t4.Column1 = @p1
    and t1.Column1 = @p2
    and t3.FirstName = @FirstName
    and t3.LastName = @LastName
    and t6.Column1 = @p5
    and (@p6 is null or t2.Column6 = @p6)
order …