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sent_sara
Constraint Violating Yak Guru
377 Posts |
 Posted - 2008-06-26 : 02:52:29
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| While Iam trying to execute the below query alter table UDS_Expense_account_Group add constraint fk_exp_grp foreign key(Expense_group)references UDS_Expense_Group(Expense_group)Error faced:There are no primary or candidate keys in the referenced table 'UDS_Expense_Group' that match the referencing column list in the foreign key 'fk_exp_grp'.keys for the table:UDS_Expense_Group primary keypk_exp(sno, Expense_group)I know that reference table value should be unique.But i need the sno and expense_group column to be uniquehow to solve can anyone help???? |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2008-06-26 : 02:57:59
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| but how can it guarantee that Expense_group alone will be unique in UDS_Expense_Group? |
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jezemine
Master Smack Fu Yak Hacker
2886 Posts |
Posted - 2008-06-26 : 02:58:12
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I was under the impression that FK must point to a PK. You could try creating a separate unique index on just UDS_Expense_Group(Expense_group) and see if it lets you create the FK then.
elsasoft.org |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2008-06-26 : 02:59:37
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quote:
Originally posted by jezemine
I was under the impression that FK must point to a PK. You could try creating a separate unique index on just UDS_Expense_Group(Expense_group) and see if it lets you create the FK then.
elsasoft.org
before that OP needs to make sure he have only unique values of Expense_group appearing in the table. |
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jezemine
Master Smack Fu Yak Hacker
2886 Posts |
Posted - 2008-06-26 : 03:05:24
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well, creating that index will certainly tell them the answer to that question. :)
elsasoft.org |
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sent_sara
Constraint Violating Yak Guru
377 Posts |
Posted - 2008-06-26 : 03:55:25
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txs for ur reply visakh16.yes ur right since it is a composite key(sno,expense_group) it cannot be guarantee that expense_group alone be unique.but i need sno should be unique and expense_group should also be unique. so can i create unique key on sno and primary key on expense_group???quote:
Originally posted by visakh16
but how can it guarantee that Expense_group alone will be unique in UDS_Expense_Group?
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2008-06-26 : 03:56:55
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quote:
Originally posted by sent_sara
txs for ur reply visakh16.yes ur right since it is a composite key(sno,expense_group) it cannot be guarantee that expense_group alone be unique.but i need sno should be unique and expense_group should also be unique. so can i create unique key on sno and primary key on expense_group???quote:
Originally posted by visakh16
but how can it guarantee that Expense_group alone will be unique in UDS_Expense_Group?
Yup you can do that. create pk on expense_no and unique on sno |
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sent_sara
Constraint Violating Yak Guru
377 Posts |
Posted - 2008-06-26 : 04:32:06
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Txs for everyonequote:
Originally posted by visakh16
quote:
Originally posted by sent_sara
txs for ur reply visakh16.yes ur right since it is a composite key(sno,expense_group) it cannot be guarantee that expense_group alone be unique.but i need sno should be unique and expense_group should also be unique. so can i create unique key on sno and primary key on expense_group???quote:
Originally posted by visakh16
but how can it guarantee that Expense_group alone will be unique in UDS_Expense_Group?
Yup you can do that. create pk on expense_no and unique on sno
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Key problem