Question

以下Teradata查询大约需要18秒才能完成。 IN子句中传递的突出显示值来自另一个Oracle数据库，因此我无法实现与该表的连接。

SELECT distinct sec.SerialNum esn, ef.EngineFamilyCd family, em.EngineModelCd model,
es.EngineSeriesCd series, sac.AircraftTailNum tailNumRef, sec.EnginePositionNum enginePosition,
o1.OrganizationId ownerOrgId, o2.OrganizationId operatorOrgId,
sec.EngineInstallationDttm installedDate, sec.EngineRemovalDttm removalDate,
sec.HardwareConfigNm hardwareConfig, sec.EngineControlNm engineControl,
sec.ApplicationSelectorNm appSelector, sec.EngineMonitorInd engineMonitorInd,
sec.EngineThrustRatingFctr engineThrustRating, sec.StatusDesc engineStatus, sec.n1modifiernum n1modifier
FROM DB_MASTER_BV.SZEngineCurrent sec, 
 DB_MASTER_BV.EngineSeries es,
DB_MASTER_BV.EngineModel em,
DB_Master_BV.EngineFamily ef,
DB_MASTER_BV.SZAircraftCurrent sac, 
 DB_MASTER_BV.Organization o1, 
 DB_MASTER_BV.Organization o2 
 WHERE sec.EngineSeriesCd = es.EngineSeriesCd 
 and es.EngineModelCd = em.EngineModelCd 
 and  em.EngineFamilyCd = ef.EngineFamilyCd 
 and sec.MasterAircraftId = sac.MasterAircraftId 
 and o1.MasterOrganizationId = sec.OwnerMasterOrganizationId 
and o2.MasterOrganizationId = sec.OperatorMasterOrganizationId 
AND (sec.SerialNum in('733276','193283','690168','741471','876374','873383','193386','906397','804314','900116','785670','900399','724321','193488','811373','779917','193699','994688',
'779410','575169','A59299','900206','193297','575484','896359','367230','810105','876485','906385','876484','707149','811222','706801','193596','731949','697881',
'889697','804626','575194','707159','706129','900230','900231','706834','811352','900229','785748','193460','888221','906272','906266','906264','906263','994356',
'194431','731966','892417','811341','577413','741572','575564','889262','706956','876157','900257','900153','706958','706957','960436','892429','892427','900354',
'697138','645655','193352','994337','707189','697833','959190','900246','811317','577437','193643','697976','890692','193229','965579','900137','900135','894897',
'697723','193363','193367','785505','907077','959184','811311','706526','577302','706529','994332','702792','706663','779834','731931','960127','193371','876183',
'741563','193235','803843','577320','994318','907087','741460','907086','959170','994462','900464','193626','877503','643711','811202','811201','704585','193504',
'193500','875246','704876','725834','699783','699780','802380','900304','706885','906191','577773','959152','872574','811435','697388','699381','892485','577698',
'907035','811445','907039','894999','894857','894595','697273','894597','959139','577894','874898','706959','900424','193337','577697','907011','875696','699555',
'699554','575629','906149','906150','193452','962968','811264','811266','962970','875395','699543','575638','906153','857962','896247','858349','779746','906161',
'906928','802857','779640','193424','550309','424520','550305','575608','872517','906169','892196','811386','811385','906173','907220','959234','876666','959231',
'876662','893785','875914','802649','550218','550315','906111','741984','550319','906405','906501','550118','643371','785254','550116','550117','802946','906629',
'907145','550325','550324','906837','550320','906838','702591','550220','550227','906415','690289','906517','704416','731431','550125','959201','906413','994176',
'550333','550140','550337','891651','550141','550338','906746','907269','550132','550137','550138','892914','550342','906123','550153','550345','950923','906129',
'873188','906850','906953','690270','890713','645352','893127','697590','874826','424439','893126','907110','550144','856305','690269','892824','550256','550257',
'906867','907186','960852','720754','960851','906866','888607','805573','811530','960756','872352','550266','550267','550264','811518','888896','906730','994958',
'892247','960970','875186','906987','424124','550232','A59303','702660','875885','811609','888626','424219','906897','994981','731502','697496','695345','962996',
'894371','907153','805541','907154','424337','906613','906615','900512','906610','956141','994611','804582','994718','888648','575219','888756','896973','424395',
'872117','A59227','697616','731380','697614','900161','690410','994213','956155','956154','779492','994231','702876','577248','994727','193818','890879','722243',
'906499','577354','888560','645121','896972','960823','804279','900175','888853','193724','550285','550282','906469','994803','906466','888299','877141','890984',
'695688','994533','888327','A59348','A59346','994410','733116','550296','550290','550292','906478','731763','725658','896408','645145','994751','731654','740358',
'906441','550158','193849','906543','906448','994262','575824','424186','906345','643663','888305','906243','906244','702963','906453','906452','956119','906451',
'956116','950489','550166','906454','367457','896764','575833','994268','906252','994127','733236','906258','956123','550178','994777','956126','956127','956128',
'906786','906788','906687','643290','994631','956225','994632','888574','906365','804228','731599','643682','550182','804369','994784','550186','550183','888826',
'575127','906439','890482','906438','906691','890472','994509','193147','575718','804215','575276','994793','897257'))
and END(sec.EngineValidPd) is until_changed 
 order by esn

此外，如果记录超过1000条，我将按如下方式实现IN子句 AND（sec.SerialNum in（前999 recods）或sec.SerialNum in（next 999 recods）...或sec.SerialNum in（剩余recods））请建议比上述查询更快的解决方案，这不会导致IN子句

中超过1000条记录的问题

Answer 1

您的Teradata版本是什么？

在TD14中有一个内置的表函数来分割一串值，你可以简单地传递一个字符串中的所有值：

AND sec.SerialNum IN
 (
   SELECT token
   FROM TABLE (STRTOK_SPLIT_TO_TABLE(1, '733276,193283,690168,741471,876374', ',')
        RETURNS (outkey INTEGER,
                 tokennum INTEGER,
                 token VARCHAR(20) CHARACTER SET UNICODE)
              ) AS d
 )

IN子句的SQL调优

1 个答案: