SQL查询优化不存在

Question

我需要优化以下查询,有人可以帮忙吗？我知道这是导致问题的不存在部分,因为它正在进行大规模的表扫描,但我是新手,有人可以给出任何建议吗？

select count(*)
from Job j
where company = 'A'
and branch = 'Branch123'
and engineerNumber = '000123'
and ID > 60473
and not exists(
select JobNumber, Company, Branch
from OutboundEvents o
where o.JobNumber = j.JobNumber
    and o.branch = j.branch
    and o.company = j.company
    and o.Formtype = 'CompleteJob')

Answer 1

create index [<indexname>] on [Job] (
    [company], [branch], [engineerNumber], [ID]) include ([JobNumber]);
create index [<indexname>] on [OutboundEvents] (
    [company], [branch], [JobNumber], [Formtype]);

您优化的查询不是您优化的数据模型.首先阅读设计索引.