测试in和or的执行时间

declare @d datetime
set @d=getdate()
/*你的SQL脚本开始*/
SELECT * FROM T_KNOWLEDGE WHERE KNOWLEDGE_TYPE_OID = 'c82d4ca4-9548-4274-bb80-d00d9a2fcd68' or KNOWLEDGE_TYPE_OID = 'f2917b90-a19e-4787-b27a-81038523d251'
/*你的SQL脚本结束*/
select [语句执行花费时间(毫秒)]=datediff(ms,@d,getdate()) 


set @d=getdate()
/*你的SQL脚本开始*/
SELECT * FROM T_KNOWLEDGE WHERE KNOWLEDGE_TYPE_OID in ( 'c82d4ca4-9548-4274-bb80-d00d9a2fcd68' , 'f2917b90-a19e-4787-b27a-81038523d251')

/*你的SQL脚本结束*/
select [语句执行花费时间(毫秒)]=datediff(ms,@d,getdate()) 

结论：in的时间会执行更长一点