Oracle SQL 按日期查找唯一 ID

Question

专家您好,

我是运行 Windows 上的 Oracle 12c。我已查询以查找任何新 ID 及其输入日期。我想知道您将如何更改查询以将确切日期作为搜索的一部分，而不是仅扫描 table 上的所有日期记录。我的查询：

select carid, inventory_date from car_source t where not exists
      (select carid from car_source t2 where t.carid = t2.carid and t.inventory_date != t2.inventory_date);

Table 建造：

CREATE TABLE "CAR_SOURCE" 
   (    "COUNT_CARS" NUMBER(10,0), 
   "EQUIPMENT_TYPE" VARCHAR2(100 BYTE), 
   "LOCATION" VARCHAR2(500 BYTE), 
   "INVENTORY_DATE" DATE, 
   "COUNT_INVENTORY" VARCHAR2(3000 BYTE), 
   "CARID" VARCHAR2(20 BYTE)
  ) SEGMENT CREATION IMMEDIATE 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
  NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS" ;

插入行：

    Insert into CAR_SOURCE    (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID)    values (3,'Trans AM','London',to_date('04-JUL-19','DD-MON-RR'),null,'0001');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (5,'Chevy Volt','London',to_date('30-AUG-19','DD-MON-RR'),null,'0002');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (6,'Trans AM','coventry',to_date('07-SEP-19','DD-MON-RR'),null,'0001');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (5,'Chevy Volt','coventry',to_date('02-SEP-19','DD-MON-RR'),null,'0002');
 Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (8,'Rovers','coventry',to_date('07-SEP-19','DD-MON-RR'),null,'0003');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (9,'Jaguars','coventry',to_date('07-SEP-19','DD-MON-RR'),null,'0004');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (7,'Rovers','London',to_date('30-AUG-19','DD-MON-RR'),null,'0003');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (10,'Escalade','London',to_date('17-SEP-19','DD-MON-RR'),null,'0005');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (12,'Mustangs','London',to_date('11-SEP-19','DD-MON-RR'),null,'0006');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (2,'Trans AM','Brummy',to_date('20-SEP-19','DD-MON-RR'),null,'0001');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (5,'Limo','London',to_date('12-SEP-19','DD-MON-RR'),null,'0007');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (2,'Lambo','Essex',to_date('19-SEP-19','DD-MON-RR'),null,'0008');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (1,'Limo','London',to_date('19-SEP-19','DD-MON-RR'),null,'0007');
Insert into CAR_SOURCE (COUNT_CARS,EQUIPMENT_TYPE,LOCATION,INVENTORY_DATE,COUNT_INVENTORY,CARID) values (2,'Chevy Volt','London',to_date('19-SEP-19','DD-MON-RR'),null,'0002');

结果：

carid 日期 0004 07-SEP-19 0005 2019 年 9 月 17 日 0006 19 年 9 月 11 日 0008 2019 年 9 月 19 日

假设我想查询特定日期“19-SEP-19”，我是否会为第一个查询创建别名并将其加入第二个日期查询？关于如何将其整合在一起的任何建议都会非常有帮助。最亲切的问候，吉莉

Answer 1

如果要查找在特定日期输入的 ID，可以使用聚合：

select car_id
from car_source
group by car_id
having min(inventory_date) = date '2019-09-19';

如果您想要 table 中的所有记录，

EXISTS 很有用。但是，如果您只想在该日期首次输入 car_id，则聚合是一种简单的方法。

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