oracle - Not able to add a new column to the existing primary key -


i have primary key pk1 table table1. need add 1 more column existing primary key. tying following alter script 

alter table table1 add constraint "primarykeys" primary key ("pk1", "pk2");  error report: sql error: ora-02260: table can have 1 primary key 02260. 00000 -  "table can have 1 primary key" *cause:    self-evident. *action:   remove primary key.

how can add 1 more column primary key, without affecting data(data has been verified , there no duplication.)

if have concern new data violates pk can added during time interval when old pk dropped, new 1 not created, can create unique index first :

create unique index idxu_table1_pk on table1(pk1,pk2); alter table table1 drop constraint [old_pk_constraint_name] ; alter table table1 add constraint "primarykeys" primary key    (pk1,pk2) using index idxu_table1_pk;

another option keep index associated old pk constraint until new pk created :

alter table table1 drop constraint [old_pk_constraint_name] keep index; alter table table1 add constraint "primarykeys" primary key    (pk1,pk2) ; drop index [name of unique index associated old pk constraint];

Comments

Post a Comment

Popular posts from this blog

user interface - How to replace the Python logo in a Tkinter-based Python GUI app? -

is there way change default logo, python logo , appears in window's task bar? notice have replaced default tk logo used appear in application window. i using windows 7 , python 2.6 , developing gui of tkinter. you can using winico tk extension package. winico package can used add system tray icons tk programs. the following sample shows 1 way change runtime application icon. note need provide .ico file suitable sizes of icons in on command line , need use pythonw. not change taskbar icon console when running python script. test extracted winico0.6 package python\tcl\winico0.6 folder package require winico work , ran code below using pythonw winico_test.py path\to\some\ico\file.ico . import sys tkinter import * def main(argv): root = tk() root.update() root.tk.call('package','require','winico') id = root.tk.call('winico','createfrom',argv[1]) root.tk.call('winico','setwindow',root,id...
Read more

objective c - Greedy NSProgressIndicator Allocation -

i'm using bunch of nsprogressindicators @ once (32 exact) , looks when they're animating start allocating memory no one's business greedy_run http://i62.tinypic.com/15rgmso.png i've got reports app slowdown , crash after days of uptime, , looks culprit, it's hard pinpoint bugs take days appear. i comment out call start animating, memory behaves expected. result of multiple nsprogressindicators alloc'ed on same thread? or maybe sandboxing? of constant allocations coming core animation threads, don't know else going on. custom nsview progress indicator lives in @interface myview () @property (nonatomic, strong) nsimageview *imageview; @property (nonatomic, strong) nstextview *numbertxt; @property (nonatomic, strong) nsprogressindicator *progress; @end @implementation myview - (id)initwithframe:(nsrect)framerect { self = [super initwithframe:framerect]; if (self) { // image nsimage *image = [nsimage imagenamed:@"bg.png"]; c...
Read more

how to set an OCR language in Google Drive -

i need upload image google drive including ocr feature. the problem setocrlanguage method. need specify hebrew language , based on iso 639-1 codes should "heb". i'm getting response "code" : 400, "errors" : [ { "domain" : "global", "location" : "ocrlanguage", "locationtype" : "parameter", "message" : "invalid value", "reason" : "invalid" } ], any idea should code or can list of avaliable codes?
Read more