Re: [SQL] weird(to me) request
--On Thursday, September 25, 2003 20:09:35 +0100 Richard Huxton <[EMAIL PROTECTED]> wrote: On Thursday 25 September 2003 19:51, Larry Rosenman wrote: I have the following rows (in addition to others): acct_num text, master_acct_num text, These are in the same table. What I want to enforce is that if the master_acct_num field is NOT NULL (it can be NULL, and that's fine), that the value appears in some row as acct_num. acct_num has a unique index on it, so that's fine. I'm not sure how to do this ALTER TABLE my_table ADD CONSTRAINT my_self_fk FOREIGN KEY (master_acct_num) REFERENCES my_table (acct_num); It's really just a foreign-key to yourself I wasn't sure I could do that. Thanks! LER -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 972-414-9812 E-Mail: [EMAIL PROTECTED] US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749 pgp0.pgp Description: PGP signature
Re: [SQL] weird(to me) request
On Thursday 25 September 2003 19:51, Larry Rosenman wrote: > I have the following rows (in addition to others): > > acct_num text, > master_acct_num text, > > > These are in the same table. > > What I want to enforce is that if the master_acct_num field is NOT NULL (it > can be NULL, and > that's fine), that the value appears in some row as acct_num. acct_num has > a unique index on it, so that's fine. > > I'm not sure how to do this ALTER TABLE my_table ADD CONSTRAINT my_self_fk FOREIGN KEY (master_acct_num) REFERENCES my_table (acct_num); It's really just a foreign-key to yourself -- Richard Huxton Archonet Ltd ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [SQL] weird(to me) request
--On Thursday, September 25, 2003 20:59:25 +0200 Adam Wieckowski <[EMAIL PROTECTED]> wrote: U¿ytkownik Larry Rosenman napisa³: I have the following rows (in addition to others): acct_num text, master_acct_num text, These are in the same table. What I want to enforce is that if the master_acct_num field is NOT NULL (it can be NULL, and that's fine), that the value appears in some row as acct_num. acct_num has a unique index on it, so that's fine. I'm not sure how to do this Thanks! LER select case when master_acct_num is null then acct_num else master_acct_num end from table; did you mained somethink like this ? I'm actually looking to enforce the fact that if master_acct_num is entered, it points to a valid acct_num. LER -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 972-414-9812 E-Mail: [EMAIL PROTECTED] US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749 pgp0.pgp Description: PGP signature
Re: [SQL] weird(to me) request
Użytkownik Larry Rosenman napisał: I have the following rows (in addition to others): acct_num text, master_acct_num text, These are in the same table. What I want to enforce is that if the master_acct_num field is NOT NULL (it can be NULL, and that's fine), that the value appears in some row as acct_num. acct_num has a unique index on it, so that's fine. I'm not sure how to do this Thanks! LER select case when master_acct_num is null then acct_num else master_acct_num end from table; did you mained somethink like this ? smime.p7s Description: S/MIME Cryptographic Signature
