How can I use EXISTS and no SEPARATE in this query? DDL/DML (attached)

Example queries SQL start - from the beginner to the professional by Clare Churcher(sorry about the long example script)


I have 3 tables: Member, entry, tournament (scripts DDL/DML attached below).

The members and tournament tables have no common column. Member.Membertype and Tournament.tourtype are different columns despite the similarity of its content


Table 1. Member
 MEMBERID LASTNAME             FIRSTNAME            MEMBERTYPE         
--------- -------------------- -------------------- --------------
      118 McKenzie             Melissa              Junior             
      138 Stone                Michael              Senior             
      153 Nolan                Brenda               Senior             
      176 Branch               Helen                Social             
      178 Beck                 Sarah                Social             
      228 Burton               Sandra               Junior             
      235 Cooper               William              Senior             
      239 Spence               Thomas               Senior             
      258 Olson                Barbara              Senior             
      286 Pollard              Robert               Junior             
      290 Sexton               Thomas               Senior             
      323 Wilcox               Daniel               Senior             
      331 Schmidt              Thomas               Senior             
      332 Bridges              Deborah              Senior             
      339 Young                Betty                Senior             
      414 Gilmore              Jane                 Junior             
      415 Taylor               William              Senior             
      461 Reed                 Robert               Senior             
      469 Willis               Carolyn              Junior             
      487 Kent                 Susan                Social

20 rows selected.
      
Table 2: Entry
  MEMBERID     TOURID       YEAR
---------- ---------- ----------
       118         24       2005
       228         24       2006
       228         25       2006
       228         36       2006
       235         38       2004
       235         38       2006
       235         40       2005
       235         40       2006
       239         25       2006
       239         40       2004
       258         24       2005
       258         38       2005
       286         24       2004
       286         24       2005
       286         24       2006
       415         24       2006
       415         25       2004
       415         36       2005
       415         36       2006
       415         38       2004
       415         38       2006
       415         40       2004
       415         40       2005
       415         40       2006

24 rows selected.
Table 3: Tournament
  TOURID TOURNAME             TOURTYPE
-------- -------------------- --------------
      24 Leeston              Social
      25 Kaiapoi              Social
      36 WestCoast            Open
      38 Canterbury           Open
      40 Otago                Open
My requirement:+.
I need to find the names of all those who entered the tournament Open (tournament. Tourtype = open). So I wrote the following query
 select distinct m.memberid, m.lastname, m.firstname, t.tourtype
 from
 member m inner join entry e on (m.memberid=e.memberid)
 inner join tournament t on (e.tourid=t.tourid)
 and upper(t.tourtype)='OPEN'
 order by m.lastname;
It gives me a correct result.
 MEMBERID LASTNAME   FIRSTNAME  TOURTYPE
-------- ---------- ---------- ------------------
     228 Burton     Sandra     Open
     235 Cooper     William    Open
     258 Olson      Barbara    Open
     239 Spence     Thomas     Open
     415 Taylor     William    Open
But it means I can write this SQL using operator EXISTS?



The DDL and DML to tables and their data
CREATE TABLE Type(
    Type VARCHAR2(20) Primary Key,
    Fee number)
/

CREATE TABLE Member(
    MemberID NUMBER Primary Key,
    LastName VARCHAR2(20),
    FirstName VARCHAR2(20),
    MemberType VARCHAR2(20) constraint fk1_member References type(type),
    Phone VARCHAR2(20), Handicap NUMBER, JoinDate DATE, Coach NUMBER, Team
    VARCHAR2(20), Gender VARCHAR2(1))
/



CREATE TABLE Tournament(
    TourID NUMBER Primary Key,
    TourName VARCHAR2(20),
    TourType VARCHAR2(20))
/



CREATE TABLE Entry(
    MemberID NUMBER constraint fk1_entry References Member(memberid),
    TourID NUMBER constraint fk2_entry References Tournament(tourid), Year
    NUMBER,
constraint pk_entry Primary Key (MemberID, TourID, Year))
/

Insert into Type values ('Junior',150)
/


Insert into Type values ('Senior',300)
/


Insert into Type values ('Social',50)
/


Insert into Member values
(118,'McKenzie','Melissa','Junior','963270',30,null,null,null,'F')
/
 Insert
into Member values
(138,'Stone','Michael','Senior','983223',30,null,null,null,'M')
/
 Insert
into Member values
(153,'Nolan','Brenda','Senior','442649',11,null,null,'TeamB','F')
/
 Insert
into Member values
(176,'Branch','Helen','Social','589419',null,null,null,null,'F')
/
 Insert
into Member values
(178,'Beck','Sarah','Social','226596',null,null,null,null,'F')
/
 Insert
into Member values
(228,'Burton','Sandra','Junior','244493',26,null,null,null,'F')
/
 Insert
into Member values
(235,'Cooper','William','Senior','722954',14,null,null,'TeamB','M')
/
Insert into Member values
(239,'Spence','Thomas','Senior','697720',10,null,null,null,'M')
/
 Insert
into Member values
(258,'Olson','Barbara','Senior','370186',16,null,null,null,'F')
/
 Insert
into Member values
(286,'Pollard','Robert','Junior','617681',19,null,null,'TeamB','M')
/
Insert into Member values (290,'Sexton
','Thomas','Senior','268936',26,null,null,null,'M')
/
 Insert into Member
values (323,'Wilcox','Daniel','Senior','665393',3,null,null,'TeamA','M')
/
Insert into Member values
(331,'Schmidt','Thomas','Senior','867492',25,null,null,null,'M')
/
 Insert
into Member values
(332,'Bridges','Deborah','Senior','279087',12,null,null,null,'F')
/
 Insert
into Member values
(339,'Young','Betty','Senior','507813',21,null,null,'TeamB','F')
/
 Insert
into Member values
(414,'Gilmore','Jane','Junior','459558',5,null,null,'TeamA','F')
/
 Insert
into Member values
(415,'Taylor','William','Senior','137353',7,null,null,'TeamA','M')
/
 Insert
into Member values
(461,'Reed','Robert','Senior','994664',3,null,null,'TeamA','M')
/
 Insert
into Member values
(469,'Willis','Carolyn','Junior','688378',29,null,null,null,'F')
/
 Insert
into Member values
(487,'Kent','Susan','Social','707217',null,null,null,null,'F')
/

Insert into Tournament values (24,'Leeston','Social')
/


Insert into Tournament values (25,'Kaiapoi','Social')
/


Insert into Tournament values (36,'WestCoast','Open')
/


Insert into Tournament values (38,'Canterbury','Open')
/


Insert into Tournament values (40,'Otago','Open')
/




Insert into Entry values (118,24,2005)
/


Insert into Entry values (228,24,2006)
/


Insert into Entry values (228,25,2006)
/


Insert into Entry values (228,36,2006)
/


Insert into Entry values (235,38,2004)
/


Insert into Entry values (235,38,2006)
/


Insert into Entry values (235,40,2005)
/


Insert into Entry values (235,40,2006)
/


Insert into Entry values (239,25,2006)
/


Insert into Entry values (239,40,2004)
/


Insert into Entry values (258,24,2005)
/


Insert into Entry values (258,38,2005)
/


Insert into Entry values (286,24,2004)
/


Insert into Entry values (286,24,2005)
/


Insert into Entry values (286,24,2006)
/


Insert into Entry values (415,24,2006)
/


Insert into Entry values (415,25,2004)
/


Insert into Entry values (415,36,2005)
/


Insert into Entry values (415,36,2006)
/


Insert into Entry values (415,38,2004)
/


Insert into Entry values (415,38,2006)
/


Insert into Entry values (415,40,2004)
/


Insert into Entry values (415,40,2005)
/


Insert into Entry values (415,40,2006)
/

Hello, because you select tournament.tourtype in the SELECTION list, the answer is not really. If you have need of t.tourtype in the SELECT list, you might have:

select m.memberid, m.lastname, m.firstname
from member m
where exists (select 1
        from entry e inner join tournament t on (e.tourid=t.tourid)
        where m.memberid=e.memberid
            and upper(t.tourtype)='OPEN');

And you know that the t.tourtype is 'OPEN' anyway, if you do not need to SELECT. So, you may have it, and the answer is Yes:

select m.memberid, m.lastname, m.firstname, 'OPEN' tourtype
from member m
where exists (select 1
        from entry e inner join tournament t on (e.tourid=t.tourid)
        where m.memberid=e.memberid
            and upper(t.tourtype)='OPEN');

Published by: Seanmacgc on May 7, 2009 02:09

Tags: Database

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