临时表与临时表变量索引

Question

我已经在存储过程中创建了一个临时表并对其进行了索引，并创建了一个临时变量表​​并将其编入索引。我发现临时表更快。请参阅下面的我的实施。可能有人告诉我，如果有我的方式已申请指标

临时表执行

if object_id('tempdb..#maxPeriod') is not null drop table #maxPeriod else 
    select 
      fp.companyId, 
      max(fi.periodenddate) as maxPeriod 
    into #maxPeriod 
    from ciqfinperiod fp inner join ciqcompany ci on fp.companyId = ci.companyId 
      join ciqfininstance fi on fi.financialperiodid = fp.financialperiodid 
    where fp.periodtypeid = 4 
      and fi.periodenddate > @date 
      and fi.latestforfinancialperiodflag = 1 
      and latestfilingforinstanceflag = 1 

    group by fp.companyId 

    CREATE NONCLUSTERED INDEX IDX_companyId2 on #maxPeriod(companyId,maxPeriod) 

临时表变量执行

DECLARE @maxPeriod TABLE (companyId INT, maxPeriod smalldatetime, 
          UNIQUE NONCLUSTERED (companyId, maxPeriod)) 
    INSERT INTO @maxPeriod 
select 
     fp.companyId, 
     max(fi.periodenddate) as maxPeriod 

from ciqfinperiod fp inner join ciqcompany ci on fp.companyId = ci.companyId 
     join ciqfininstance fi on fi.financialperiodid = fp.financialperiodid 
where fp.periodtypeid = 4 
     and fi.periodenddate > @date 
     and fi.latestforfinancialperiodflag = 1 
     and latestfilingforinstanceflag = 1 

group by fp.companyId 

Answer 1

临时表通常要更快一些什么区别，请参阅以下链接以获得清晰的说明：https://www.brentozar.com/archive/2014/06/temp-tables-table-variables-memory-optimized-table-variables/