Oracle SQL分区范围全部,而不是单一范围
我按日期创建了一个分区表,当客户创建一个帐户时,我将createdate分开Oracle SQL分区范围全部,而不是单一范围,sql,oracle,query-optimization,database-partitioning,Sql,Oracle,Query Optimization,Database Partitioning,我按日期创建了一个分区表,当客户创建一个帐户时,我将createdate分开 CREATE TABLE PARTITIONED_customer ( customerId number(10) GENERATED AS IDENTITY, firstName varchar2(50), lastName varchar2(50),
CREATE TABLE PARTITIONED_customer (
customerId number(10) GENERATED AS IDENTITY,
firstName varchar2(50),
lastName varchar2(50),
email varchar2(50),
createDate date,
active char(1),
PRIMARY KEY (customerId))
PARTITION BY RANGE (createDate)
INTERVAL(NUMTOYMINTERVAL(1, 'MONTH'))
(PARTITION first_quater_2018 VALUES LESS THAN(TO_DATE('01-04-2018','dd-MM-yyyy')),
PARTITION second_quater_2018 VALUES LESS THAN(TO_DATE('01-07-2018','dd-MM-yyyy')),
PARTITION third_quater_2018 VALUES LESS THAN(TO_DATE('01-10-2018','dd-MM-yyyy')),
PARTITION fourth_quater_2018 VALUES LESS THAN(TO_DATE('01-01-2019','dd-MM-yyyy')),
PARTITION first_quater_2019 VALUES LESS THAN(TO_DATE('01-04-2019','dd-MM-yyyy')),
PARTITION second_quater_2019 VALUES LESS THAN(TO_DATE('01-07-2019','dd-MM-yyyy')),
PARTITION third_quater_2019 VALUES LESS THAN(TO_DATE('01-10-2019','dd-MM-yyyy')),
PARTITION fourth_quater_2019 VALUES LESS THAN(TO_DATE('01-01-2020','dd-MM-yyyy')));
下面是我想知道客户何时创建帐户的SQL查询。我知道这个问题并不完全正确,对此我深表歉意
select c.createdate, c.firstname, c.lastname, round(sum(p.amount)) as spentmoney
from PARTITIONED_customer c
join PARTITIONED_rental r
on c.customerid = r.customerid
join PARTITIONED_payment_amount p
on p.rentalid = r.rentalid
where c.createdate BETWEEN TO_DATE('01-05-2019','dd-MM-yyyy')
AND TO_DATE('01-06-2019','dd-MM-yyyy')
or (select round(sum(pp.amount)) from PARTITIONED_payment_amount pp
join PARTITIONED_rental rr
on rr.rentalid = pp.rentalid
where rr.customerid=c.customerid) < 50
group by c.firstname, c.lastname,c.createdate
order by c.firstname, c.lastname;
Explainer显示分区范围all,而不是single。怎么能修好呢
我用一个简单的查询检查了分区本身,结果很好。因此,我认为查询本身有问题。您的查询正在对分区客户执行完全表访问,因此它当然必须搜索所有分区。我建议在分区键上创建索引:
CREATE INDEX PARTITIONED_CUSTOMER_1
ON PARTITIONED_CUSTOMER (CREATEDATE)
LOCAL;
如果确实需要,可以在查询中指定一个PARTITION子句:
select c.createdate, c.firstname, c.lastname, round(sum(p.amount)) as spentmoney
from PARTITIONED_customer PARTITION (second_quater_2019) c
INNER join PARTITIONED_rental r
on c.customerid = r.customerid
INNER join PARTITIONED_payment_amount p
on p.rentalid = r.rentalid
where c.createdate BETWEEN TO_DATE('01-05-2019','dd-MM-yyyy') AND
TO_DATE('01-06-2019','dd-MM-yyyy') or
(select round(sum(pp.amount))
from PARTITIONED_payment_amount pp
INNER join PARTITIONED_rental rr
on rr.rentalid = pp.rentalid
where rr.customerid=c.customerid) < 50
group by c.firstname, c.lastname,c.createdate
order by c.firstname, c.lastname
还是你的意思
(c.createdate BETWEEN TO_DATE('01-05-2019','dd-MM-yyyy') AND
TO_DATE('01-06-2019','dd-MM-yyyy')) or
(select round(sum(pp.amount))
from PARTITIONED_payment_amount pp
INNER join PARTITIONED_rental rr
on rr.rentalid = pp.rentalid
where rr.customerid=c.customerid) < 50
c.createdate BETWEEN TO_DATE('01-05-2019','dd-MM-yyyy') AND
(TO_DATE('01-06-2019','dd-MM-yyyy') or
(select round(sum(pp.amount))
from PARTITIONED_payment_amount pp
INNER join PARTITIONED_rental rr
on rr.rentalid = pp.rentalid
where rr.customerid=c.customerid) < 50)
如果混合使用AND或类似的方法,最好使用括号将操作分组,否则可能无法得到预期的结果