在where子句中使用select中的計數

Question

我有這個查詢，我試圖從修訂計劃中選擇所有必須在本月完成的設備，如果我沒有爲該設備製作服務表。我想要做這樣的事情：

select revision_planning.id_echip as echip_id 
from revision_planning 
    inner join service_sheet on echip_id=service_sheet.id_echip 
where revision_planning.next_rev_date between '2016-10-01' and '2016-10-31' 
    and count (select * from service_sheet 
      where echip_id=service_sheet.id_echip 
       and service_sheet.`data`between '2016-10-01 00:00:00'and '2016-10-31 23:59:18') = 0 
    and revision_planning.employee_name='first_last_name' 

Answer 1

試着這麼做：

select revision_planning.id_echip as echip_id from revision_planning 
    inner join service_sheet on echip_id=service_sheet.id_echip 
    where revision_planning.next_rev_date between '2016-10-01' and '2016-10-31' and not exists (select 1 from service_sheet 
    where echip_id=service_sheet.id_echip and service_sheet.`data`between '2016-10-01 00:00:00'and '2016-10-31 23:59:18') 
and revision_planning.employee_name='first_last_name' 

Answer 2

您可以使用NOT EXISTS，而不是在WHERE子句

select revision_planning.id_echip as echip_id 
from revision_planning 
inner join service_sheet on echip_id=service_sheet.id_echip 
where revision_planning.next_rev_date between '2016-10-01' and '2016-10-31' 
and NOT EXISTS(select 1 from service_sheet 
where echip_id=service_sheet.id_echip and service_sheet.`data`between '2016-10-01 00:00:00'and '2016-10-31 23:59:18') 
and revision_planning.employee_name='first_last_name'