When I design my table, there comes a error:
Duplicate entry '??' for key 'emp_name_unique2'
My design table:
When I save it, comes the error.
Where is the problem?
EDIT
My data in t_employee:
That is, you see the emp_name, if you want to set it to unique, you should make sure the value is unique first.
You have many same ?? in the emp_name.
In general, Design table should before add data.
Related
I came across a weird situation:
I found a record that only exist in the entity's extension table in the DB, but doesn't appear in the entity's base table?
How is it possible?
Is there another optional reason beside the one of someone deleting the record directly from the base table?
Thanks in advance.
No other optional reasons, someone deleted manually the record from the base table
I was trying to create a secondary index in cassandra using cql3. I know I can do it using CREATE INDEX.. syntax.
But is there any way I can designate a column as Secondary key when using CREATE TABLE.. syntax i.e., while defining a table?
I have searched on internet but getting results regarding CREATE INDEX. I'm not sure how to frame it.
Nope. You have to do two queries. You can do them one after the other.
I'm currently having issue going through a test backup and restore of database table on my development machine for db2. Was never entirely successful. Although I was able to restore all data after a drop and re-create of the table, I wasn't able to reset the foreign key constraint as I got SQL error complaining that keys don't match. Here's my exact steps, I'm sure not entirely the right way to do it, but it does eventually restore the 5423 rows of data:
The process
export to /export/home/dale/comments.ixf of ixf messages /export/home/dale/msg.txt select * from .comments
Note: step 1 exports 5423 rows of data to a location
drop table .comments
import from /export/home/dale/comments.ixf of ixf create into .comments
Note: step 3 here creates the table but does not insert any data rows
load client from /export/home/dale/comments.ixf of ixf modified by identityoverride replace into .comments
Note: up until this step, I'm able to insert the 5423 rows of data in the recreated db table
alter table .comments add FOREIGN KEY (comments_id) REFERENCES .news (article_key)
Note: here alter table fails as db2 complaints that some comments_id does not match article_key
Could anyone help with my problem here? Thanks in advance
The error means that some of the rows you IMPORT into the Comments table refer to rows that do not exist in the News table.
You might not be forming the constraint correctly. The column name "comment_id" sounds like the primary key to the Comments table. You want the foreign key, which matches the primary key of the News table. It might also be called "article_key" or "article_id".
ALTER TABLE Comments
ADD FOREIGN KEY( article_key)
REFERENCES News( article_key);
If "comment_id" is really not the primary key of the "Comments" table, then the problem comes from not backing up and restoring both the News and Comments table at the same time.
You can either EXPORT and IMPORT the News table along with the Comments table, or remove the Comments that refer to missing News rows with something like this
DELETE FROM Comments
WHERE comments_id NOT IN (
SELECT article_key
FROM News
)
Before you do this, you might want to try listing the Comments which would be deleted by the above query
SELECT *
FROM Comments
WHERE comments_id NOT IN (
SELECT article_key
FROM News
)
I found a solution to my problem as well as my comments above,
user980717 resolved my first problem where I set the wrong column as the foreign key
For my 2nd issue, i.e. "SQL0668N Operation not allowed for reason code "1" on table "tablename". SQLSTATE=57016", I need to run the following command "set integrity for niwps.comments immediate checked" to ensure data satisfied all constraints defined in the table. And thanks to all who took the effort in helping me with my problems. Cheers
I have a form. When I open the form the two fields called office and group should be picked up from another database named something like staff.nsf. The data is picked up based on the applicant name as key. I have included my name in staff database. But the form is not picking up the two fields from the staff database.
The field formula goes like this,
server := #Name([CN]; #Subset(#DbName; 1));
temp:= #If(Applicant != ""; #DbLookup( "" : "NoCache"; server:"Mast\\Staff.nsf";
"ByApplicant";Applicant; 2); "");
#If(#IsError(temp);"";temp)
Is it a system bug? Can anybody help please.
Regards,
Priya
Lotus Notes is more than 20 years old, and extremely well-tested. It is very unlikely that you have found a "system bug". There are any number of possible problems here, and you need to carefully rule them out until you find the actual problem.
The first thing you should do is take the #IsError out of the formula (temporarily). By having it there, you are suppressing a potentially useful error message. Ok... admittedly the error messages are usually not that helpful, but sometimes they are. If you don't want to take it out of your formula, just add another computed-for-display field with just the #DbLoookup -- and follow Ken's advice about hard-coding everything.
Then review all of the following:
Is "mast\staff.nsf" the correct path for the database?
Do you have access to the database?
Is "ByApplicant" the correct name for the view? (Spelling errors happen!)
Do you have access to the view?
Do you have access to the documents in the view?
As Ken mentioned, is the first column in the ByApplicant view sorted?
Is the name value you are passing for Applicant in the exact same format that appears in the view column? (I.e, if it appears in abbreviated form in the view column, make sure that you are passing it to #DbLookup in abbreviated format.)
Does the second column of the view contain the value that you are trying to read? (Check out the rules for counting columns in the documentation for #DbLookup.)
A few thoughts:
The ByApplicant view needs to have its first column sorted alphabetically and that column should be the list of applicant names you are matching on
Try hard coding the value for applicant in the #DBLookup to see if it works, and to rule it out as the problem.
This does not work on the web, only on the client (I believe)
This is probably a simple matter, but when I create a new object, the ID property starts off as 0 rather than null. As I understand it, SQLite takes/needs a value of null for the PK column to do the AutoIncrement.
So the short question is how to get the ID in the object to start life as null?
Thanks
cooter
Ok, here's what the solution seems to be. After you create the tables with PK's, open the table, right click on the left most column where the key image is and you can choose to edit Keys/Relationships. In that property screen you can set the column to auto-increment.
I also followed advice on this page.
This is all done using the most excellent tools from sqlite.phxsoftware.com/
-Cooter