Thread: UPDATE across tables
I need to update the primary key field in two tables sharing this field, I can't update separately because I get an integrity violation message that tells me the field is still being referenced from the other table, fair enough but is there any way of doing a joined/linked/double update to the primary key of both tables simultaneously? Something like: UPDATE table1.fieldx, table2.fieldx SET fieldx='yyyyy' WHERE fieldx='zzzzz';
Jake Matchett
The University of Nottingham
Media Centre
Medical School, Queen's Medical Centre
Nottingham NG7 2UH
(74) 44001
voice +44 (0) 115 9249924 ext 44001
fax +44 (0) 115 9709917
< http://www.nottingham.ac.uk/aves/ >
The University of Nottingham
Media Centre
Medical School, Queen's Medical Centre
Nottingham NG7 2UH
(74) 44001
voice +44 (0) 115 9249924 ext 44001
fax +44 (0) 115 9709917
< http://www.nottingham.ac.uk/aves/ >
On Wed, 2002-08-07 at 12:01, Jake Matchett wrote: > I need to update the primary key field in two tables sharing this field, > I can't update separately because I get an integrity violation message > that tells me the field is still being referenced from the other table, > fair enough but is there any way of doing a joined/linked/double update > to the primary key of both tables simultaneously? Something like: UPDATE > table1.fieldx, table2.fieldx SET fieldx='yyyyy' WHERE fieldx='zzzzz'; The foreign key reference must be deferrable. Like this: CREATE TABLE b (id CHAR(1) PRIMARY KEY REFERENCES a DEFERRABLE, ...); For the update, do both in one transaction, with deferred constraints: SET CONSTRAINTS ALL DEFERRED; BEGIN; UPDATE table1 ... UPDATE table2... END; -- Oliver Elphick Oliver.Elphick@lfix.co.uk Isle of Wight, UK http://www.lfix.co.uk/oliver GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C ======================================== "If ye be reproached for the name of Christ, happy are ye; for the spirit of glory and of God resteth upon you; on their part He is spoken evil of, but on your part He is glorified." I Peter 4:14