Question

我正在实施电影数据库。我有表：movies，people，movie_people，awards。 people和movies都有id为award的字段，可以是NULL。我不知道如何制作SQL查询打印出演员名单，这些演员在电影中播放，由有3个或更多奖项的导演执导？

CREATE TABLE "LAB"."MOVIE" 
   (    "MOVIE_ID" NUMBER NOT NULL ENABLE, 
    "TITLE" VARCHAR2(219 BYTE) NOT NULL ENABLE, 
    "YEARMADE" DATE, 
    "COUNTRY" VARCHAR2(40 BYTE), 
    "RUNNINGTIME" NUMBER, 
    "LANGUAGE" VARCHAR2(40 BYTE), 
    "TAG_ID" NUMBER NOT NULL ENABLE, 
    "REVIEW_ID" NUMBER, 
    "AWARD_ID" NUMBER, 
     PRIMARY KEY ("MOVIE_ID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 
  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"  ENABLE, 
     FOREIGN KEY ("TAG_ID")
      REFERENCES "LAB"."TAG" ("TAG_ID") ON DELETE CASCADE ENABLE, 
     FOREIGN KEY ("REVIEW_ID")
      REFERENCES "LAB"."REVIEW" ("REVIEW_ID") ON DELETE CASCADE ENABLE, 
     CONSTRAINT "AWARD_ID" FOREIGN KEY ("AWARD_ID")
      REFERENCES "LAB"."AWARD" ("AWARD_ID") ENABLE
   ) 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" ;

  CREATE TABLE "LAB"."MOVIE_PEOPLE" 
   (    "MOVIE_ID" NUMBER NOT NULL ENABLE, 
    "PEOPLE_ID" NUMBER NOT NULL ENABLE, 
    "ROLE" VARCHAR2(60 BYTE) NOT NULL ENABLE, 
     FOREIGN KEY ("MOVIE_ID")
      REFERENCES "LAB"."MOVIE" ("MOVIE_ID") ON DELETE CASCADE ENABLE, 
     FOREIGN KEY ("PEOPLE_ID")
      REFERENCES "LAB"."PEOPLE" ("PEOPLE_ID") ON DELETE CASCADE ENABLE
   ) 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" ;

  CREATE TABLE "LAB"."PEOPLE" 
   (    "PEOPLE_ID" NUMBER NOT NULL ENABLE, 
    "FAMILYNAME" VARCHAR2(40 BYTE) NOT NULL ENABLE, 
    "GIVENNAME" VARCHAR2(40 BYTE) NOT NULL ENABLE, 
    "GENDER" CHAR(1 BYTE) NOT NULL ENABLE, 
    "DATEOFBIRTH" DATE, 
    "TAG_ID" NUMBER, 
    "AWARD_ID" NUMBER, 
     PRIMARY KEY ("PEOPLE_ID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 
  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"  ENABLE, 
     FOREIGN KEY ("TAG_ID")
      REFERENCES "LAB"."TAG" ("TAG_ID") ON DELETE CASCADE ENABLE, 
     FOREIGN KEY ("AWARD_ID")
      REFERENCES "LAB"."AWARD" ("AWARD_ID") ON DELETE CASCADE ENABLE
   ) 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" ;

  CREATE TABLE "LAB"."AWARD" 
   (    "AWARD_ID" NUMBER NOT NULL ENABLE, 
    "TITLE" VARCHAR2(40 BYTE) NOT NULL ENABLE, 
    "YEAR" DATE NOT NULL ENABLE, 
     PRIMARY KEY ("AWARD_ID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 
  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"  ENABLE
   ) 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" ;

Answer 1

您应该查看SQL中的HAVING语句，这样您就可以仅过滤具有3个或更多奖项的导演。

<强>更新

此外，您还需要向导演ID添加FOREIGN KEY奖励。除非奖励可以属于多个人，否则您必须创建一个关系表。

如何计算子查询中的结果

1 个答案: