mysql - SQL error code 1054 unknown column -


this query: 

create table if not exists applications (     idresearch int not null,      idprof char(10) not null,     primary key (idresearch, idprof),     foreign key (idresearch) references research(idresearch),     foreign key (idprof) references professor(idprof) );

and table:

insert `university`.`applications` (`idresearch`, `idprof`) values ('10', '123456789'); insert `university`.`applications` (`idresearch`, `idprof`) values ('10', '432156789'); insert `university`.`applications` (`idresearch`, `idprof`) values ('10', '789654321'); insert `university`.`applications` (`idresearch`, `idprof`) values ('11', '876098432'); insert `university`.`applications` (`idresearch`, `idprof`) values ('11', '234567890'); insert `university`.`applications` (`idresearch`, `idprof`) values ('12', '432156789'); insert `university`.`applications` (`idresearch`, `idprof`) values ('12', '789654321'); insert `university`.`applications` (`idresearch`, `idprof`) values ('13', '876098432'); insert `university`.`applications` (`idresearch`, `idprof`) values ('14', '876098432'); insert `university`.`applications` (`idresearch`, `idprof`) values ('14', '987654321'); insert `university`.`applications` (`idresearch`, `idprof`) values ('15', '432156789'); insert `university`.`applications` (`idresearch`, `idprof`) values ('16', '123456789'); insert `university`.`applications` (`idresearch`, `idprof`) values ('16', '432156789'); insert `university`.`applications` (`idresearch`, `idprof`) values ('16', '789654321'); insert `university`.`applications` (`idresearch`, `idprof`) values ('17', '789654321'); insert `university`.`applications` (`idresearch`, `idprof`) values ('17', '432156789');

15:26:13 create table if not exists applications ( idresearch int not null, idprof char(10) not null, primary key (idresearch, idprof), foreign key (idresearch) references research(idresearch), foreign key (idprof) references professor(idprof) ) error code: 1215. cannot add foreign key constraint 0.109 sec

there no problem syntax in query, data issue.

before executing insert query, check following

  1. table 'research' & column 'idresearch' exist
  2. table 'professor' & column 'idprof' exist
  3. the reference values (in insert query) columns idresearch, idprof should exist in research , professor tables resp.

truncate\delete , drop 'applications' table manually , create once again. execute insert query.


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