sql - Error :ORA-02270 -

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the error got .

foreign key (bid)        references allocation (bid),        *

error @ line 8: ora-02270: no matching unique or primary key column-list

not sure how fix it. allocation , worksession week entities. helps appreciated.

    create table book(     bid          number(4),     title        varchar2(30) constraint nn_title not null,     sellingprice number(6,2) constraint chk_selling_price check(sellingprice>0),     primary key  (bid)     );      create table author(     authorid    number(4),     sname       varchar2(30),     fname       varchar(30),     primary key (authorid),     constraint uc_author_name unique(sname,fname)     );      create table allocation(     bid         number(4),     authorid    number(4),     payrate     number(6,2) constraint chk_pay_rate check(payrate>1 , payrate<79.99),     primary key (bid,authorid),     foreign key (bid)      references book   (bid),     foreign key (authorid) references author (authorid)     );      create table worksession(     bid       number(4),     authorid  number(4),     workyear  number(4)   constraint chk_workyear  check(workyear<2013 , workyear>2011),     workweek  number(2)   constraint chk_workweek  check(workweek>1 , workweek<52),     workhours number(4,2) constraint chk_workhours check(workhours>0.5 , workhours<99.99),     primary key (bid,authorid,workyear,workweek),     ***foreign key (bid)       references allocation (bid),      foreign key (authorid) references allocation (authorid)     );

your fk must point an existing primary key (pk) or unique key(uk);

use create statement last table:

create table worksession(     bid       number(4),     authorid  number(4),     workyear  number(4)   constraint chk_workyear  check(workyear<2013 , workyear>2011),     workweek  number(2)   constraint chk_workweek  check(workweek>1 , workweek<52),     workhours number(4,2) constraint chk_workhours check(workhours>0.5 , workhours<99.99),     primary key (bid,authorid,workyear,workweek),     ***foreign key (bid)       references allocation (bid),      foreign key (bid, authorid) references allocation (bid, authorid)     );

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