Sql Oracle MAX（）错误，带有NULL CBO索引修复，导致索引限制
2011年1月31日更新 我想我是在挑战分贝的极限。按表达式分组Sql Oracle MAX（）错误，带有NULL CBO索引修复，导致索引限制,sql,oracle,oracle10g,indexing,cbo,Sql,Oracle,Oracle10g,Indexing,Cbo,2011年1月31日更新 我想我是在挑战分贝的极限。按表达式分组 所有不可区分的聚合函数都可能超过一个 数据库块。 看 原创帖子： 这在Oracle Database 10g Enterprise Edition 10.2.0.1.0版-Prod上 以下插入不会返回真正的MAX（）值 如果有两条匹配键相同的记录，则有一条 具有一个contributionP空值，另一个具有非空值。 有时，MAX（）返回的值是空值 INSERT /*+ APPEND */ INTO meCostingXPrePre
所有不可区分的聚合函数都可能超过一个
数据库块。
看 原创帖子： 这在Oracle Database 10g Enterprise Edition 10.2.0.1.0版-Prod上 以下插入不会返回真正的MAX（）值
如果有两条匹配键相同的记录，则有一条
具有一个contributionP空值，另一个具有非空值。
有时，MAX（）返回的值是空值
INSERT /*+ APPEND */ INTO meCostingXPrePre(
matchKey ,
contributionP ,
stimulusContributionP ,
contributionC ,
ageMultiplier ,
rateTableIdP ,
rateTableIdC ,
accountNbrP ,
accountNbrC ,
commissionExpenseAccount ,
commissionReceivableAccount ,
commissionType ,
commission ,
pmPm ,
fee ,
planAgeGroupIdP ,
planAgeGroupIdC ,
rafP ,
rafC ,
nbrEmployeesRafP ,
nbrEmployeesRafC ,
contractId ,
basePlanId ,
groupOrPolicyNumber ,
planCoverageDescription ,
cobraGopn ,
cobraPcd ,
cobraCid ,
benefitId ,
insuranceStart ,
insuranceEnd ,
categoryId )
SELECT
matchKey as matchKey ,
MAX(NVL(contributionP ,0 )) as contributionP ,
MAX(NVL(stimulusContributionP ,0 )) as stimulusContributionP ,
MAX(NVL(contributionC ,0 )) as contributionC ,
MAX(NVL(ageMultiplier ,0 )) as ageMultiplier ,
MAX(NVL(rateTableIdP ,0 )) as rateTableIdP ,
MAX(NVL(rateTableIdC ,0 )) as rateTableIdC ,
MAX(NVL(accountNbrP ,0 )) as accountNbrP ,
MAX(NVL(accountNbrC ,0 )) as accountNbrC ,
MAX(NVL(commissionExpenseAccount ,0 )) as commissionExpenseAccount ,
MAX(NVL(commissionReceivableAccount ,0 )) as commissionReceivableAccount ,
MAX(NVL(commissionType ,0 )) as commissionType ,
MAX(NVL(commission ,0 )) as commission ,
MAX(NVL(pmPm ,0 )) as pmPm ,
MAX(NVL(fee ,0 )) as fee ,
MAX(NVL(planAgeGroupIdP ,0 )) as planAgeGroupIdP ,
MAX(NVL(planAgeGroupIdC ,0 )) as planAgeGroupIdC ,
MAX(NVL(rafP ,0 )) as rafP ,
MAX(NVL(rafC ,0 )) as rafC ,
MAX(NVL(nbrEmployeesRafP ,0 )) as nbrEmployeesRafP ,
MAX(NVL(nbrEmployeesRafC ,0 )) as nbrEmployeesRafC ,
CASE WHEN MAX(contractId) IS NOT NULL AND
MIN(contractId) IS NOT NULL AND
MAX(contractId) != MIN(contractId) THEN
CASE WHEN MAX(contractId) = 'No Contract No' THEN
MIN(contractId)
WHEN MIN(contractId) = 'No Contract No' THEN
MAX(contractId)
ELSE
MAX(contractId)
END
ELSE
MAX(contractId)
END as contractId ,
MAX(NVL(basePlanId ,0 )) as basePlanId ,
CASE WHEN MAX(groupOrPolicyNumber) IS NOT NULL AND
MIN(groupOrPolicyNumber) IS NOT NULL AND
MAX(groupOrPolicyNumber) != MIN(groupOrPolicyNumber) THEN
CASE WHEN MAX(groupOrPolicyNumber) = 'No Contract No' THEN
MIN(groupOrPolicyNumber)
WHEN MIN(groupOrPolicyNumber) = 'No Contract No' THEN
MAX(groupOrPolicyNumber)
ELSE
MAX(groupOrPolicyNumber)
END
ELSE
MAX(groupOrPolicyNumber)
END as groupOrPolicyNumber ,
CASE WHEN MAX(planCoverageDescription) IS NOT NULL AND
MIN(planCoverageDescription) IS NOT NULL AND
MAX(planCoverageDescription) != MIN(planCoverageDescription) THEN
CASE WHEN MAX(planCoverageDescription) = 'No Contract No' THEN
MIN(planCoverageDescription)
WHEN MIN(planCoverageDescription) = 'No Contract No' THEN
MAX(planCoverageDescription)
ELSE
MAX(planCoverageDescription)
END
ELSE
MAX(planCoverageDescription)
END as planCoverageDescription ,
CASE WHEN MAX(cobraGopn) IS NOT NULL AND
MIN(cobraGopn) IS NOT NULL AND
MAX(cobraGopn) != MIN(cobraGopn) THEN
CASE WHEN MAX(cobraGopn) = 'No Contract No' THEN
MIN(cobraGopn)
WHEN MIN(cobraGopn) = 'No Contract No' THEN
MAX(cobraGopn)
ELSE
MAX(cobraGopn)
END
ELSE
MAX(cobraGopn)
END as cobraGopn ,
CASE WHEN MAX(cobraPcd) IS NOT NULL AND
MIN(cobraPcd) IS NOT NULL AND
MAX(cobraPcd) != MIN(cobraPcd) THEN
CASE WHEN MAX(cobraPcd) = 'No Contract No' THEN
MIN(cobraPcd)
WHEN MIN(cobraPcd) = 'No Contract No' THEN
MAX(cobraPcd)
ELSE
MAX(cobraPcd)
END
ELSE
MAX(cobraPcd)
END as cobraPcd ,
CASE WHEN MAX(cobraCid) IS NOT NULL AND
MIN(cobraCid) IS NOT NULL AND
MAX(cobraCid) != MIN(cobraCid) THEN
CASE WHEN MAX(cobraCid) = 'No Contract No' THEN
MIN(cobraCid)
WHEN MIN(cobraCid) = 'No Contract No' THEN
MAX(cobraCid)
ELSE
MAX(cobraCid)
END
ELSE
MAX(cobraCid)
END as cobraCid ,
MAX(benefitId ) as benefitId ,
NULL as insuranceStart ,
NULL as insuranceEnd ,
NULL as categoryId
FROM meCostingXPrePrePre
GROUP BY matchKey;
CREATE INDEX C$MECOSTINGXPREPREPRE$MULTI0 ON MECOSTINGXPREPREPRE
(MATCHKEY, CONTRIBUTIONP, STIMULUSCONTRIBUTIONP, CONTRIBUTIONC, AGEMULTIPLIER,
RATETABLEIDP, RATETABLEIDC, ACCOUNTNBRP, ACCOUNTNBRC, COMMISSIONEXPENSEACCOUNT,
COMMISSIONRECEIVABLEACCOUNT, COMMISSIONTYPE, COMMISSION, PMPM, FEE,
PLANAGEGROUPIDP, PLANAGEGROUPIDC, RAFP, RAFC,
NBREMPLOYEESRAFP, NBREMPLOYEESRAFC, CONTRACTID, BASEPLANID, GROUPORPOLICYNUMBER,
PLANCOVERAGEDESCRIPTION, COBRAGOPN, COBRAPCD, COBRACID, BENEFITID)
NOLOGGING
TABLESPACE INDX
NOPARALLEL;
INSERT /*+ APPEND */ INTO meCostingXPrePre(
...)
SELECT /*+ INDEX(meCostingXPrePrePre c$mecostingxpreprepre$multi0) */
...
FROM meCostingXPrePrePre
GROUP BY matchKey;
我需要额外添加15列并更改索引 小问题
CREATE INDEX C$MECOSTINGXPREPREPRE$MULTI0 ON MECOSTINGXPREPREPRE
(MATCHKEY, CONTRIBUTIONP, STIMULUSCONTRIBUTIONP, CONTRIBUTIONC, AGEMULTIPLIER,
RATETABLEIDP, RATETABLEIDC, ACCOUNTNBRP, ACCOUNTNBRC, COMMISSIONEXPENSEACCOUNT,
COMMISSIONRECEIVABLEACCOUNT, COMMISSIONTYPE, COMMISSION, PMPM, FEE,
PLANAGEGROUPIDP, PLANAGEGROUPIDC, ADDRESSONEP, ADDRESSONEC, ADDRESSTWOP,
ADDRESSTWOC, CITYP, CITYC, STATEP, STATEC, ZIPFULLP, ZIPFULLC, RAFP, RAFC,
NBREMPLOYEESRAFP, NBREMPLOYEESRAFC, CONTRACTID, BASEPLANID, GROUPORPOLICYNUMBER,
PLANCOVERAGEDESCRIPTION, COBRAGOPN, COBRAPCD, COBRACID, BENEFITID)
NOLOGGING
TABLESPACE INDX
NOPARALLEL;
ORA-01793:索引列的最大数量为32 第一个MAX（）不适用于大型列集，第二个是index+CBO补丁
导致索引限制
有什么建议吗 如果得到的结果不正确，那显然是Oracle的错误。您是否记录了Oracle支持部门的支持请求和/或确定了您遇到的错误（我猜这就是解决方法的来源）
如果您使用的是10.2.0.1，您是否尝试过应用最新的补丁集（最有可能是10.2.0.4）？在最初的10.2版本和终端10.2版本之间，有许多错误修复。如果这是Oracle已修复的错误，也可能有一次性修补程序，尽管该修补程序可能需要安装最新的修补程序集。您是否尝试过这样编写查询的选择部分。它应该返回相同的结果 它分两步工作：首先计算所需的最小值和最大值，然后进行一些空值替换。（您的CASE语句似乎过于复杂，因为您没有考虑到空字符串和NULL在Oracle中是相同的。） 我很想知道内部选择是否已经有错误的最大结果
SELECT
matchKey as matchKey ,
NVL(contributionP ,0 ) as contributionP ,
NVL(stimulusContributionP ,0 ) as stimulusContributionP ,
NVL(contributionC ,0 ) as contributionC ,
NVL(ageMultiplier ,0 ) as ageMultiplier ,
NVL(rateTableIdP ,0 ) as rateTableIdP ,
NVL(rateTableIdC ,0 ) as rateTableIdC ,
NVL(accountNbrP ,0 ) as accountNbrP ,
NVL(accountNbrC ,0 ) as accountNbrC ,
NVL(commissionExpenseAccount ,0 ) as commissionExpenseAccount ,
NVL(commissionReceivableAccount ,0 ) as commissionReceivableAccount ,
NVL(commissionType ,0 ) as commissionType ,
NVL(commission ,0 ) as commission ,
NVL(pmPm ,0 ) as pmPm ,
NVL(fee ,0 ) as fee ,
NVL(planAgeGroupIdP ,0 ) as planAgeGroupIdP ,
NVL(planAgeGroupIdC ,0 ) as planAgeGroupIdC ,
NVL(rafP ,0 ) as rafP ,
NVL(rafC ,0 ) as rafC ,
NVL(nbrEmployeesRafP ,0 ) as nbrEmployeesRafP ,
NVL(nbrEmployeesRafC ,0 ) as nbrEmployeesRafC ,
CASE
WHEN maxContractId = 'No Contract No' THEN minContractId
ELSE maxContractId
END as contractId ,
NVL(basePlanId ,0 ) as basePlanId ,
CASE
WHEN maxGroupOrPolicyNumber = 'No Contract No' THEN minGroupOrPolicyNumber
ELSE maxGroupOrPolicyNumber
END as groupOrPolicyNumber ,
CASE
WHEN maxPlanCoverageDescription = 'No Contract No' THEN minPlanCoverageDescription
ELSE maxPlanCoverageDescription
END as planCoverageDescription ,
CASE
WHEN maxCobraGopn = 'No Contract No' THEN minCobraGopn
ELSE maxCobraGopn
END as cobraGopn ,
CASE
WHEN maxCobraPcd = 'No Contract No' THEN minCobraPcd
ELSE maxCobraPcd
END as cobraPcd ,
CASE
WHEN maxCobraCid = 'No Contract No' THEN minCobraCid
ELSE maxCobraCid
END as cobraCid ,
benefitId as benefitId ,
NULL as insuranceStart ,
NULL as insuranceEnd ,
NULL as categoryId
FROM (
SELECT
matchKey as matchKey ,
MAX(contributionP ) as contributionP ,
MAX(stimulusContributionP ) as stimulusContributionP ,
MAX(contributionC ) as contributionC ,
MAX(ageMultiplier ) as ageMultiplier ,
MAX(rateTableIdP ) as rateTableIdP ,
MAX(rateTableIdC ) as rateTableIdC ,
MAX(accountNbrP ) as accountNbrP ,
MAX(accountNbrC ) as accountNbrC ,
MAX(commissionExpenseAccount ) as commissionExpenseAccount ,
MAX(commissionReceivableAccount ) as commissionReceivableAccount ,
MAX(commissionType ) as commissionType ,
MAX(commission ) as commission ,
MAX(pmPm ) as pmPm ,
MAX(fee ) as fee ,
MAX(planAgeGroupIdP ) as planAgeGroupIdP ,
MAX(planAgeGroupIdC ) as planAgeGroupIdC ,
MAX(rafP ) as rafP ,
MAX(rafC ) as rafC ,
MAX(nbrEmployeesRafP ) as nbrEmployeesRafP ,
MAX(nbrEmployeesRafC ) as nbrEmployeesRafC ,
MIN(contractId ) as minContractId ,
MAX(contractId ) as maxContractId ,
MAX(basePlanId ) as basePlanId ,
MIN(groupOrPolicyNumber ) as minGroupOrPolicyNumber ,
MAX(groupOrPolicyNumber ) as maxGroupOrPolicyNumber ,
MIN(planCoverageDescription ) as minPlanCoverageDescription ,
MAX(planCoverageDescription ) as maxPlanCoverageDescription ,
MIN(cobraGopn ) as minCobraGopn ,
MAX(cobraGopn ) as maxCobraGopn ,
MIN(cobraPcd ) as mincobraPcd ,
MAX(cobraPcd ) as maxcobraPcd ,
MIN(cobraCid ) as minCobraCid ,
MAX(cobraCid ) as maxCobraCid ,
MAX(benefitId ) as benefitId
FROM meCostingXPrePrePre
GROUP BY matchKey
);
好吧，把工作一分为二就能得到我需要的：
INSERT /*+ APPEND */ INTO meCostingXPrePreFirstHalf(
matchKey ,
contributionP ,
stimulusContributionP ,
contributionC ,
ageMultiplier ,
rateTableIdP ,
rateTableIdC ,
accountNbrP ,
accountNbrC ,
commissionExpenseAccount ,
commissionReceivableAccount ,
commissionType ,
commission ,
pmPm ,
fee ,
planAgeGroupIdP ,
planAgeGroupIdC )
SELECT
matchKey as matchKey ,
MAX(NVL(contributionP ,0 )) as contributionP ,
MAX(NVL(stimulusContributionP ,0 )) as stimulusContributionP ,
MAX(NVL(contributionC ,0 )) as contributionC ,
MAX(NVL(ageMultiplier ,0 )) as ageMultiplier ,
MAX(NVL(rateTableIdP ,0 )) as rateTableIdP ,
MAX(NVL(rateTableIdC ,0 )) as rateTableIdC ,
MAX(NVL(accountNbrP ,0 )) as accountNbrP ,
MAX(NVL(accountNbrC ,0 )) as accountNbrC ,
MAX(NVL(commissionExpenseAccount ,0 )) as commissionExpenseAccount ,
MAX(NVL(commissionReceivableAccount ,0 )) as commissionReceivableAccount ,
MAX(NVL(commissionType ,0 )) as commissionType ,
MAX(NVL(commission ,0 )) as commission ,
MAX(NVL(pmPm ,0 )) as pmPm ,
MAX(NVL(fee ,0 )) as fee ,
MAX(NVL(planAgeGroupIdP ,0 )) as planAgeGroupIdP ,
MAX(NVL(planAgeGroupIdC ,0 )) as planAgeGroupIdC
FROM meCostingXPrePrePre
GROUP BY matchKey;
/* No commit yet. */
INSERT /*+ APPEND */ INTO meCostingXPrePreOtherHalf(
matchKey ,
rafP ,
rafC ,
nbrEmployeesRafP ,
nbrEmployeesRafC ,
contractId ,
basePlanId ,
groupOrPolicyNumber ,
planCoverageDescription ,
cobraGopn ,
cobraPcd ,
cobraCid ,
benefitId ,
insuranceStart ,
insuranceEnd ,
categoryId )
SELECT
matchKey as matchKey ,
MAX(NVL(rafP ,0 )) as rafP ,
MAX(NVL(rafC ,0 )) as rafC ,
MAX(NVL(nbrEmployeesRafP ,0 )) as nbrEmployeesRafP ,
MAX(NVL(nbrEmployeesRafC ,0 )) as nbrEmployeesRafC ,
CASE WHEN MAX(contractId) IS NOT NULL AND
MIN(contractId) IS NOT NULL AND
MAX(contractId) != MIN(contractId) THEN
CASE WHEN MAX(contractId) = 'No Contract No' THEN
MIN(contractId)
WHEN MIN(contractId) = 'No Contract No' THEN
MAX(contractId)
ELSE
MAX(contractId)
END
ELSE
MAX(contractId)
END as contractId ,
MAX(NVL(basePlanId ,0 )) as basePlanId ,
CASE WHEN MAX(groupOrPolicyNumber) IS NOT NULL AND
MIN(groupOrPolicyNumber) IS NOT NULL AND
MAX(groupOrPolicyNumber) != MIN(groupOrPolicyNumber) THEN
CASE WHEN MAX(groupOrPolicyNumber) = 'No Contract No' THEN
MIN(groupOrPolicyNumber)
WHEN MIN(groupOrPolicyNumber) = 'No Contract No' THEN
MAX(groupOrPolicyNumber)
ELSE
MAX(groupOrPolicyNumber)
END
ELSE
MAX(groupOrPolicyNumber)
END as groupOrPolicyNumber ,
CASE WHEN MAX(planCoverageDescription) IS NOT NULL AND
MIN(planCoverageDescription) IS NOT NULL AND
MAX(planCoverageDescription) != MIN(planCoverageDescription) THEN
CASE WHEN MAX(planCoverageDescription) = 'No Contract No' THEN
MIN(planCoverageDescription)
WHEN MIN(planCoverageDescription) = 'No Contract No' THEN
MAX(planCoverageDescription)
ELSE
MAX(planCoverageDescription)
END
ELSE
MAX(planCoverageDescription)
END as planCoverageDescription ,
CASE WHEN MAX(cobraGopn) IS NOT NULL AND
MIN(cobraGopn) IS NOT NULL AND
MAX(cobraGopn) != MIN(cobraGopn) THEN
CASE WHEN MAX(cobraGopn) = 'No Contract No' THEN
MIN(cobraGopn)
WHEN MIN(cobraGopn) = 'No Contract No' THEN
MAX(cobraGopn)
ELSE
MAX(cobraGopn)
END
ELSE
MAX(cobraGopn)
END as cobraGopn ,
CASE WHEN MAX(cobraPcd) IS NOT NULL AND
MIN(cobraPcd) IS NOT NULL AND
MAX(cobraPcd) != MIN(cobraPcd) THEN
CASE WHEN MAX(cobraPcd) = 'No Contract No' THEN
MIN(cobraPcd)
WHEN MIN(cobraPcd) = 'No Contract No' THEN
MAX(cobraPcd)
ELSE
MAX(cobraPcd)
END
ELSE
MAX(cobraPcd)
END as cobraPcd ,
CASE WHEN MAX(cobraCid) IS NOT NULL AND
MIN(cobraCid) IS NOT NULL AND
MAX(cobraCid) != MIN(cobraCid) THEN
CASE WHEN MAX(cobraCid) = 'No Contract No' THEN
MIN(cobraCid)
WHEN MIN(cobraCid) = 'No Contract No' THEN
MAX(cobraCid)
ELSE
MAX(cobraCid)
END
ELSE
MAX(cobraCid)
END as cobraCid ,
MAX(benefitId ) as benefitId
FROM meCostingXPrePrePre
GROUP BY matchKey;
/* No commit yet. */
INSERT /*+ APPEND */ INTO meCostingXPrePre(
matchKey ,
contributionP ,
stimulusContributionP ,
contributionC ,
ageMultiplier ,
rateTableIdP ,
rateTableIdC ,
accountNbrP ,
accountNbrC ,
commissionExpenseAccount ,
commissionReceivableAccount ,
commissionType ,
commission ,
pmPm ,
fee ,
planAgeGroupIdP ,
planAgeGroupIdC ,
rafP ,
rafC ,
nbrEmployeesRafP ,
nbrEmployeesRafC ,
contractId ,
basePlanId ,
groupOrPolicyNumber ,
planCoverageDescription ,
cobraGopn ,
cobraPcd ,
cobraCid ,
benefitId ,
insuranceStart ,
insuranceEnd ,
categoryId )
SELECT
f.matchKey as matchKey ,
f.contributionP as contributionP ,
f.stimulusContributionP as stimulusContributionP ,
f.contributionC as contributionC ,
f.ageMultiplier as ageMultiplier ,
f.rateTableIdP as rateTableIdP ,
f.rateTableIdC as rateTableIdC ,
f.accountNbrP as accountNbrP ,
f.accountNbrC as accountNbrC ,
f.commissionExpenseAccount as commissionExpenseAccount ,
f.commissionReceivableAccount as commissionReceivableAccount ,
f.commissionType as commissionType ,
f.commission as commission ,
f.pmPm as pmPm ,
f.fee as fee ,
f.planAgeGroupIdP as planAgeGroupIdP ,
f.planAgeGroupIdC as planAgeGroupIdC ,
o.rafP as rafP ,
o.rafC as rafC ,
o.nbrEmployeesRafP as nbrEmployeesRafP ,
o.nbrEmployeesRafC as nbrEmployeesRafC ,
o.contractId as contractId ,
o.basePlanId as basePlanId ,
o.groupOrPolicyNumber as groupOrPolicyNumber ,
o.planCoverageDescription as planCoverageDescription ,
o.cobraGopn as cobraGopn ,
o.cobraPcd as cobraPcd ,
o.cobraCid as cobraCid ,
o.benefitId as benefitId ,
o.insuranceStart as insuranceStart ,
o.insuranceEnd as insuranceEnd ,
o.categoryId as categoryId ,
NULL as insuranceStart ,
NULL as insuranceEnd ,
NULL as categoryId
FROM
meCostingXPrePreFirstHalf f
INNER JOIN meCostingXPrePreOtherHalf o
ON f.matchKey = o.matchKey;
/* Now it is safe to commit. */
COMMIT;
“我需要额外增加15列”——这些词几乎不应该……不……永远不应该被说出来。如果要向已在使用的表中添加15列，则设计会出现问题。如果你有15列，你应该考虑看你可以在哪里正常化。马克斯（NVL（COBRAPCD，‘’））应该做什么？在Oracle中，“”与NULL相同，因此NVL（cobraPcd“”）与cobraPcd相同。MAX还是会处理空值。这个bug列在Metalink上了吗？你能想出一个简单的（意味着没有那么多列）测试用例来重现它吗？所有MAX（NVL（u，，））类型的行都是我认为Oracle MAX（）错误会得到解决的东西。出于所有目的，''==NULL。我现在已经做了更改，NVL（，''）不应该包含在上面。存储过程上下文中的规范化导致连接完全失控。我同意源表和目标表的规范化，但是，规范化并不总是适用于所有上下文的完美解决方案。在一个完美的世界中听起来不错。然而，Oracle的技术支持反应不是很快，论坛上除了升级或补丁之外，没有人有什么可说的。@Dragos-您没有应用最新补丁集有什么原因吗？想要坚持使用旧版本的人通常这样做是因为他们认为旧版本更稳定。但它们更稳定，因为已经发布了许多修补程序集来修复各种错误。对我来说，运行一个没有补丁的旧版本似乎很奇怪。应用补丁集还可以排除大量bug，使故障排除更加容易。@Justin-我将下载并添加补丁集。我想你不会得到太多响应，因为大多数人从未见过这样做的查询。MAX中的NVL对我来说没有多大意义。JOTN，请参阅我在父问题后的第一条评论。可能GROUP BY表达式和所有不可区分的聚合函数都超过了单个数据库块。看到上面没有工作。在我的环境中，GROUP BY加上两倍数量的聚合函数可以很好地超过1dB块。