1. create table & data create table many_value (a char(12), b char(12), primary key(a,b)); delimiter // create procedure insert_to_many_value(IN n int) begin declare t int default 1; while t<=n do insert into many_value values(123456789012+t,123456789012+t); set t = t+1; end while; end;// delimiter ; call insert_to_many_value(100000); 2. The queries: (This query takes almost the same time to run or to explain.) select * from many_value where (a,b) in ( ('123456789020','123456789020'), ('123456789030','123456789030'), ('123456789040','123456789040'), ('123456789050','123456789050'), ('123456789060','123456789060'), ('123456789070','123456789070'), ('123456789080','123456789080'), ('123456789090','123456789090'), ('123456789100','123456789100'), ('123456789110','123456789110'), ('123456789120','123456789120'), ('123456789130','123456789130'), ('123456789140','123456789140'), ('123456789150','123456789150'), ('123456789160','123456789160'), ('123456789170','123456789170'), ('123456789180','123456789180'), ('123456789190','123456789190'), ('123456789200','123456789200'), ('123456789210','123456789210'), ('123456789220','123456789220'), ('123456789230','123456789230'), ('123456789240','123456789240'), ('123456789250','123456789250'), ('123456789260','123456789260'), ('123456789270','123456789270'), 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('123456796180','123456796180'), ('123456796190','123456796190'), ('123456796200','123456796200'), ('123456796210','123456796210'), ('123456796220','123456796220'), ('123456796230','123456796230'), ('123456796240','123456796240'), ('123456796250','123456796250'), ('123456796260','123456796260'), ('123456796270','123456796270'), ('123456796280','123456796280'), ('123456796290','123456796290'), ('123456796300','123456796300'), ('123456796310','123456796310'), ('123456796320','123456796320'), ('123456796330','123456796330'), ('123456796340','123456796340'), ('123456796350','123456796350'), ('123456796360','123456796360'), ('123456796370','123456796370'), ('123456796380','123456796380'), ('123456796390','123456796390'), ('123456796400','123456796400'), ('123456796410','123456796410'), ('123456796420','123456796420'), ('123456796430','123456796430'), ('123456796440','123456796440'), ('123456796450','123456796450'), ('123456796460','123456796460'), ('123456796470','123456796470'), ('123456796480','123456796480'), ('123456796490','123456796490'), ('123456796500','123456796500'), ('123456796510','123456796510'), ('123456796520','123456796520'), ('123456796530','123456796530'), ('123456796540','123456796540'), ('123456796550','123456796550'), ('123456796560','123456796560'), ('123456796570','123456796570'), ('123456796580','123456796580'), ('123456796590','123456796590'), ('123456796600','123456796600'), ('123456796610','123456796610'), ('123456796620','123456796620'), ('123456796630','123456796630'), ('123456796640','123456796640'), ('123456796650','123456796650'), ('123456796660','123456796660'), ('123456796670','123456796670'), ('123456796680','123456796680'), ('123456796690','123456796690'), ('123456796700','123456796700'), ('123456796710','123456796710'), ('123456796720','123456796720'), ('123456796730','123456796730'), ('123456796740','123456796740'), ('123456796750','123456796750'), ('123456796760','123456796760'), ('123456796770','123456796770'), ('123456796780','123456796780'), ('123456796790','123456796790'), ('123456796800','123456796800'), ('123456796810','123456796810'), ('123456796820','123456796820'), ('123456796830','123456796830'), ('123456796840','123456796840'), ('123456796850','123456796850'), ('123456796860','123456796860'), ('123456796870','123456796870'), ('123456796880','123456796880'), ('123456796890','123456796890'), ('123456796900','123456796900'), ('123456796910','123456796910'), ('123456796920','123456796920'), ('123456796930','123456796930'), ('123456796940','123456796940'), ('123456796950','123456796950'), ('123456796960','123456796960'), ('123456796970','123456796970'), ('123456796980','123456796980'), ('123456796990','123456796990'), ('123456797000','123456797000'), ('123456797010','123456797010'), ('123456797020','123456797020'), ('123456797030','123456797030'), ('123456797040','123456797040'), ('123456797050','123456797050'), ('123456797060','123456797060'), ('123456797070','123456797070'), ('123456797080','123456797080'), ('123456797090','123456797090'), ('123456797100','123456797100'), ('123456797110','123456797110'), ('123456797120','123456797120'), ('123456797130','123456797130'), ('123456797140','123456797140'), ('123456797150','123456797150'), ('123456797160','123456797160'), ('123456797170','123456797170'), ('123456797180','123456797180'), ('123456797190','123456797190'), ('123456797200','123456797200'), ('123456797210','123456797210'), ('123456797220','123456797220'), ('123456797230','123456797230'), ('123456797240','123456797240'), ('123456797250','123456797250'), ('123456797260','123456797260'), ('123456797270','123456797270'), ('123456797280','123456797280'), ('123456797290','123456797290'), ('123456797300','123456797300'), ('123456797310','123456797310'), ('123456797320','123456797320'), ('123456797330','123456797330'), ('123456797340','123456797340'), ('123456797350','123456797350'), ('123456797360','123456797360'), ('123456797370','123456797370'), ('123456797380','123456797380'), ('123456797390','123456797390'), ('123456797400','123456797400'), ('123456797410','123456797410'), ('123456797420','123456797420'), ('123456797430','123456797430'), ('123456797440','123456797440'), ('123456797450','123456797450'), ('123456797460','123456797460'), ('123456797470','123456797470'), ('123456797480','123456797480'), ('123456797490','123456797490'), ('123456797500','123456797500'), ('123456797510','123456797510'), ('123456797520','123456797520'), ('123456797530','123456797530'), ('123456797540','123456797540'), ('123456797550','123456797550'), ('123456797560','123456797560'), ('123456797570','123456797570'), ('123456797580','123456797580'), ('123456797590','123456797590'), ('123456797600','123456797600'), ('123456797610','123456797610'), ('123456797620','123456797620'), ('123456797630','123456797630'), ('123456797640','123456797640'), ('123456797650','123456797650'), ('123456797660','123456797660'), ('123456797670','123456797670'), ('123456797680','123456797680'), ('123456797690','123456797690'), ('123456797700','123456797700'), ('123456797710','123456797710'), ('123456797720','123456797720'), ('123456797730','123456797730'), ('123456797740','123456797740'), ('123456797750','123456797750'), ('123456797760','123456797760'), ('123456797770','123456797770'), ('123456797780','123456797780'), ('123456797790','123456797790'), ('123456797800','123456797800'), ('123456797810','123456797810'), ('123456797820','123456797820'), ('123456797830','123456797830'), ('123456797840','123456797840'), ('123456797850','123456797850'), ('123456797860','123456797860'), ('123456797870','123456797870'), ('123456797880','123456797880'), ('123456797890','123456797890'), ('123456797900','123456797900'), ('123456797910','123456797910'), ('123456797920','123456797920'), ('123456797930','123456797930'), ('123456797940','123456797940'), ('123456797950','123456797950'), ('123456797960','123456797960'), ('123456797970','123456797970'), ('123456797980','123456797980'), ('123456797990','123456797990'), ('123456798000','123456798000'), ('123456798010','123456798010'), ('123456798020','123456798020'), ('123456798030','123456798030'), ('123456798040','123456798040'), ('123456798050','123456798050'), ('123456798060','123456798060'), ('123456798070','123456798070'), ('123456798080','123456798080'), ('123456798090','123456798090'), ('123456798100','123456798100'), ('123456798110','123456798110'), ('123456798120','123456798120'), ('123456798130','123456798130'), ('123456798140','123456798140'), ('123456798150','123456798150'), ('123456798160','123456798160'), ('123456798170','123456798170'), ('123456798180','123456798180'), ('123456798190','123456798190'), ('123456798200','123456798200'), ('123456798210','123456798210'), ('123456798220','123456798220'), ('123456798230','123456798230'), ('123456798240','123456798240'), ('123456798250','123456798250'), ('123456798260','123456798260'), ('123456798270','123456798270'), ('123456798280','123456798280'), ('123456798290','123456798290'), ('123456798300','123456798300'), ('123456798310','123456798310'), ('123456798320','123456798320'), ('123456798330','123456798330'), ('123456798340','123456798340'), ('123456798350','123456798350'), ('123456798360','123456798360'), ('123456798370','123456798370'), ('123456798380','123456798380'), ('123456798390','123456798390'), ('123456798400','123456798400'), ('123456798410','123456798410'), ('123456798420','123456798420'), ('123456798430','123456798430'), ('123456798440','123456798440'), ('123456798450','123456798450'), ('123456798460','123456798460'), ('123456798470','123456798470'), ('123456798480','123456798480'), ('123456798490','123456798490'), ('123456798500','123456798500'), ('123456798510','123456798510'), ('123456798520','123456798520'), ('123456798530','123456798530'), ('123456798540','123456798540'), ('123456798550','123456798550'), ('123456798560','123456798560'), ('123456798570','123456798570'), ('123456798580','123456798580'), ('123456798590','123456798590'), ('123456798600','123456798600'), ('123456798610','123456798610'), ('123456798620','123456798620'), ('123456798630','123456798630'), ('123456798640','123456798640'), ('123456798650','123456798650'), ('123456798660','123456798660'), ('123456798670','123456798670'), ('123456798680','123456798680'), ('123456798690','123456798690'), ('123456798700','123456798700'), ('123456798710','123456798710'), ('123456798720','123456798720'), ('123456798730','123456798730'), ('123456798740','123456798740'), ('123456798750','123456798750'), ('123456798760','123456798760'), ('123456798770','123456798770'), ('123456798780','123456798780'), ('123456798790','123456798790'), ('123456798800','123456798800'), ('123456798810','123456798810'), ('123456798820','123456798820'), ('123456798830','123456798830'), ('123456798840','123456798840'), ('123456798850','123456798850'), ('123456798860','123456798860'), ('123456798870','123456798870'), ('123456798880','123456798880'), ('123456798890','123456798890'), ('123456798900','123456798900'), ('123456798910','123456798910'), ('123456798920','123456798920'), ('123456798930','123456798930'), ('123456798940','123456798940'), ('123456798950','123456798950'), ('123456798960','123456798960'), ('123456798970','123456798970'), ('123456798980','123456798980'), ('123456798990','123456798990'), ('123456799000','123456799000'), ('123456799010','123456799010')); And the equivilent query which is much faster: select * from many_value where (a,b) = ('123456789020','123456789020') or (a,b) = ('123456789030','123456789030') or (a,b) = ('123456789040','123456789040') or (a,b) = ('123456789050','123456789050') or (a,b) = ('123456789060','123456789060') or (a,b) = ('123456789070','123456789070') or (a,b) = ('123456789080','123456789080') or (a,b) = ('123456789090','123456789090') or (a,b) = ('123456789100','123456789100') or (a,b) = ('123456789110','123456789110') or (a,b) = ('123456789120','123456789120') or (a,b) = ('123456789130','123456789130') or (a,b) = ('123456789140','123456789140') or (a,b) = ('123456789150','123456789150') or (a,b) = ('123456789160','123456789160') or (a,b) = ('123456789170','123456789170') or (a,b) = ('123456789180','123456789180') or (a,b) = ('123456789190','123456789190') or (a,b) = ('123456789200','123456789200') or (a,b) = ('123456789210','123456789210') or (a,b) = ('123456789220','123456789220') or (a,b) = ('123456789230','123456789230') or (a,b) = ('123456789240','123456789240') or (a,b) = ('123456789250','123456789250') or (a,b) = ('123456789260','123456789260') or (a,b) = ('123456789270','123456789270') or (a,b) = ('123456789280','123456789280') or (a,b) = ('123456789290','123456789290') or (a,b) = ('123456789300','123456789300') or (a,b) = ('123456789310','123456789310') or (a,b) = ('123456789320','123456789320') or (a,b) = ('123456789330','123456789330') or (a,b) = ('123456789340','123456789340') or (a,b) = ('123456789350','123456789350') or (a,b) = ('123456789360','123456789360') or (a,b) = ('123456789370','123456789370') or (a,b) = ('123456789380','123456789380') or (a,b) = ('123456789390','123456789390') or (a,b) = ('123456789400','123456789400') or (a,b) = ('123456789410','123456789410') or (a,b) = ('123456789420','123456789420') or (a,b) = ('123456789430','123456789430') or (a,b) = ('123456789440','123456789440') or (a,b) = ('123456789450','123456789450') or (a,b) = ('123456789460','123456789460') or (a,b) = ('123456789470','123456789470') or (a,b) = ('123456789480','123456789480') or (a,b) = ('123456789490','123456789490') or (a,b) = ('123456789500','123456789500') or (a,b) = ('123456789510','123456789510') or (a,b) = ('123456789520','123456789520') or (a,b) = ('123456789530','123456789530') or (a,b) = ('123456789540','123456789540') or (a,b) = ('123456789550','123456789550') or (a,b) = ('123456789560','123456789560') or (a,b) = ('123456789570','123456789570') or (a,b) = ('123456789580','123456789580') or (a,b) = ('123456789590','123456789590') or (a,b) = ('123456789600','123456789600') or (a,b) = ('123456789610','123456789610') or (a,b) = ('123456789620','123456789620') or (a,b) = ('123456789630','123456789630') or (a,b) = ('123456789640','123456789640') or (a,b) = ('123456789650','123456789650') or (a,b) = ('123456789660','123456789660') or (a,b) = ('123456789670','123456789670') or (a,b) = ('123456789680','123456789680') or (a,b) = ('123456789690','123456789690') or (a,b) = ('123456789700','123456789700') or (a,b) = ('123456789710','123456789710') or (a,b) = ('123456789720','123456789720') or (a,b) = ('123456789730','123456789730') or (a,b) = ('123456789740','123456789740') or (a,b) = ('123456789750','123456789750') or (a,b) = ('123456789760','123456789760') or (a,b) = ('123456789770','123456789770') or (a,b) = ('123456789780','123456789780') or (a,b) = ('123456789790','123456789790') or (a,b) = ('123456789800','123456789800') or (a,b) = ('123456789810','123456789810') or (a,b) = ('123456789820','123456789820') or (a,b) = ('123456789830','123456789830') or (a,b) = ('123456789840','123456789840') or (a,b) = ('123456789850','123456789850') or (a,b) = ('123456789860','123456789860') or (a,b) = ('123456789870','123456789870') or (a,b) = ('123456789880','123456789880') or (a,b) = ('123456789890','123456789890') or (a,b) = ('123456789900','123456789900') or (a,b) = ('123456789910','123456789910') or (a,b) = ('123456789920','123456789920') or (a,b) = ('123456789930','123456789930') or (a,b) = ('123456789940','123456789940') or (a,b) = ('123456789950','123456789950') or (a,b) = ('123456789960','123456789960') or (a,b) = ('123456789970','123456789970') or (a,b) = ('123456789980','123456789980') or (a,b) = ('123456789990','123456789990') or (a,b) = ('123456790000','123456790000') or (a,b) = ('123456790010','123456790010') or (a,b) = ('123456790020','123456790020') or (a,b) = ('123456790030','123456790030') or (a,b) = ('123456790040','123456790040') or (a,b) = ('123456790050','123456790050') or (a,b) = ('123456790060','123456790060') or (a,b) = ('123456790070','123456790070') or (a,b) = ('123456790080','123456790080') or (a,b) = ('123456790090','123456790090') or (a,b) = ('123456790100','123456790100') or (a,b) = ('123456790110','123456790110') or (a,b) = ('123456790120','123456790120') or (a,b) = ('123456790130','123456790130') or (a,b) = ('123456790140','123456790140') or (a,b) = ('123456790150','123456790150') or (a,b) = ('123456790160','123456790160') or (a,b) = ('123456790170','123456790170') or (a,b) = ('123456790180','123456790180') or (a,b) = ('123456790190','123456790190') or (a,b) = ('123456790200','123456790200') or (a,b) = ('123456790210','123456790210') or (a,b) = ('123456790220','123456790220') or (a,b) = ('123456790230','123456790230') or (a,b) = ('123456790240','123456790240') or (a,b) = ('123456790250','123456790250') or (a,b) = ('123456790260','123456790260') or (a,b) = ('123456790270','123456790270') or (a,b) = ('123456790280','123456790280') or (a,b) = ('123456790290','123456790290') or (a,b) = ('123456790300','123456790300') or (a,b) = ('123456790310','123456790310') or (a,b) = ('123456790320','123456790320') or (a,b) = ('123456790330','123456790330') or (a,b) = ('123456790340','123456790340') or (a,b) = ('123456790350','123456790350') or (a,b) = ('123456790360','123456790360') or (a,b) = ('123456790370','123456790370') or (a,b) = ('123456790380','123456790380') or (a,b) = ('123456790390','123456790390') or (a,b) = ('123456790400','123456790400') or (a,b) = ('123456790410','123456790410') or (a,b) = ('123456790420','123456790420') or (a,b) = ('123456790430','123456790430') or (a,b) = ('123456790440','123456790440') or (a,b) = ('123456790450','123456790450') or (a,b) = ('123456790460','123456790460') or (a,b) = ('123456790470','123456790470') or (a,b) = ('123456790480','123456790480') or (a,b) = ('123456790490','123456790490') or (a,b) = ('123456790500','123456790500') or (a,b) = ('123456790510','123456790510') or (a,b) = ('123456790520','123456790520') or (a,b) = ('123456790530','123456790530') or (a,b) = ('123456790540','123456790540') or (a,b) = ('123456790550','123456790550') or (a,b) = ('123456790560','123456790560') or (a,b) = ('123456790570','123456790570') or (a,b) = ('123456790580','123456790580') or (a,b) = ('123456790590','123456790590') or (a,b) = ('123456790600','123456790600') or (a,b) = ('123456790610','123456790610') or (a,b) = ('123456790620','123456790620') or (a,b) = ('123456790630','123456790630') or (a,b) = ('123456790640','123456790640') or (a,b) = ('123456790650','123456790650') or (a,b) = ('123456790660','123456790660') or (a,b) = ('123456790670','123456790670') or (a,b) = ('123456790680','123456790680') or (a,b) = ('123456790690','123456790690') or (a,b) = ('123456790700','123456790700') or (a,b) = ('123456790710','123456790710') or (a,b) = ('123456790720','123456790720') or (a,b) = ('123456790730','123456790730') or (a,b) = ('123456790740','123456790740') or (a,b) = ('123456790750','123456790750') or (a,b) = ('123456790760','123456790760') or (a,b) = ('123456790770','123456790770') or (a,b) = ('123456790780','123456790780') or (a,b) = ('123456790790','123456790790') or (a,b) = ('123456790800','123456790800') or (a,b) = ('123456790810','123456790810') or (a,b) = ('123456790820','123456790820') or (a,b) = ('123456790830','123456790830') or (a,b) = ('123456790840','123456790840') or (a,b) = ('123456790850','123456790850') or (a,b) = ('123456790860','123456790860') or (a,b) = ('123456790870','123456790870') or (a,b) = ('123456790880','123456790880') or (a,b) = ('123456790890','123456790890') or (a,b) = ('123456790900','123456790900') or (a,b) = ('123456790910','123456790910') or (a,b) = ('123456790920','123456790920') or (a,b) = ('123456790930','123456790930') or (a,b) = ('123456790940','123456790940') or (a,b) = ('123456790950','123456790950') or (a,b) = 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('123456798780','123456798780') or (a,b) = ('123456798790','123456798790') or (a,b) = ('123456798800','123456798800') or (a,b) = ('123456798810','123456798810') or (a,b) = ('123456798820','123456798820') or (a,b) = ('123456798830','123456798830') or (a,b) = ('123456798840','123456798840') or (a,b) = ('123456798850','123456798850') or (a,b) = ('123456798860','123456798860') or (a,b) = ('123456798870','123456798870') or (a,b) = ('123456798880','123456798880') or (a,b) = ('123456798890','123456798890') or (a,b) = ('123456798900','123456798900') or (a,b) = ('123456798910','123456798910') or (a,b) = ('123456798920','123456798920') or (a,b) = ('123456798930','123456798930') or (a,b) = ('123456798940','123456798940') or (a,b) = ('123456798950','123456798950') or (a,b) = ('123456798960','123456798960') or (a,b) = ('123456798970','123456798970') or (a,b) = ('123456798980','123456798980') or (a,b) = ('123456798990','123456798990') or (a,b) = ('123456799000','123456799000') or (a,b) = ('123456799010','123456799010');