CFQuery where子句与查询结果的比较

Question

我有一个查询 returns 7 条记录：

<cfquery name="equip" datasource="#datasource#">
select equipment_id from service_ticket
where equipment_id > 0
</cfquery>

然后我获取这些结果并再次使用运行另一个查询：

<cfquery name="get_equipment_tally" datasource="#datasource#">
select *
from equipment_maintenance
where active = "yes" AND id <> #equip.equipment_id#
</cfquery>

但是查询 "get_equipment_tally" 仅将 'id' 与 where 子句中我的查询结果 "equip" 中的第一条记录进行比较，即使返回了七条记录。

有解决办法吗？

Answer 1

AND id NOT IN <cfqueryparam cfsqltype="cf_sql_integer" 
    value="#valueList(equip.equipment_id)#" list="true">

理想情况下，您会把它变成一个查询

<cfquery name="get_equipment_tally" datasource="#datasource#">
select *
from equipment_maintenance
where active = "yes" AND id NOT IN (select equipment_id  from service_ticket where equipment_id > 0)
</cfquery>

Answer 2

我喜欢这些答案，但在查询中看到 NOT IN 让我感到不安。使用 LEFT OUTER JOIN... IS NULL 代替。会快很多。

SELECT <list of cols here>
FROM equipment_maintenance em
LEFT OUTER JOIN equipment_id ei ON ei.equipment_id = em.equipment_id
WHERE em.Active = 'yes'
 AND ei.equipment_id IS NULL

类似的东西。

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