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Why use Unique when Primary key on same key is already defined


Why use Unique when Primary key on same key is already defined

By : mohaned
Date : October 17 2020, 01:08 AM
To fix the issue you can do The primary key is on two columns, so you could still have non-unique eids. E.g.,
code :
eid   did
1     1
1     2


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Android SQLite PRIMARY KEY must be unique exception when primary keys are unique

Android SQLite PRIMARY KEY must be unique exception when primary keys are unique


By : user2022111
Date : March 29 2020, 07:55 AM
With these it helps
Interestingly enough, when I extract the SQLite database from my device, it seems to have all of the data.
Issues with already defined PK's: no matching unique or primary key for this column-list

Issues with already defined PK's: no matching unique or primary key for this column-list


By : Litustan
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I am aware this error is telling me I shouldn't have a FK of something that isn't a PK, but I think that's not my case and I haven't found a way around it, so here's my code: , try this:
code :
CREATE TABLE ENTITY(
    entity_id VARCHAR(20) PRIMARY KEY,
    name VARCHAR(30)
);

CREATE TABLE EXPORTER(
    exporter_id VARCHAR(20) PRIMARY KEY,
    name VARCHAR(30),
    CONSTRAINT FK_exporter_id
    FOREIGN KEY (exporter_id)
    REFERENCES ENTITY(entity_id)
);
Nonclustered indices: Unique Index including Primary Key vs Non-Unique Index without Primary Key

Nonclustered indices: Unique Index including Primary Key vs Non-Unique Index without Primary Key


By : Ivan Jorge
Date : March 29 2020, 07:55 AM
it fixes the issue If PersonID is your Primary Key, there is no storage difference between
code :
CREATE NONCLUSTERED INDEX KeyName
ON Person ([First Name], [Last Name])
CREATE NONCLUSTERED INDEX KeyName2
ON Person ([First Name], [Last Name], [PersonID])
CREATE UNIQUE NONCLUSTERED INDEX KeyName3
ON Person ([First Name], [Last Name], [PersonID)
CREATE NONCLUSTERED INDEX KeyName4
ON Person ([First Name], [Last Name], [PersonID])
The entity type requires a primary key to be defined - A primary key is the ONLY thing that's defined

The entity type requires a primary key to be defined - A primary key is the ONLY thing that's defined


By : Redmal
Date : March 29 2020, 07:55 AM
I wish this help you It turns out I forgot to put {get; set; } after the Id property. Here's the corrected model:
code :
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace APD_Remastered_Ideas.Models
{
    public class TestModel
    {
        [Key]
        public int Id { get; set; }
        public string address { get; set; }
    }
}
Primary key constraint and unique constraint defined on the same column of a table

Primary key constraint and unique constraint defined on the same column of a table


By : Sankar Dheksit
Date : March 29 2020, 07:55 AM
I wish this helpful for you A unique constraint is a unique index that's listed as a constraint object in the database.
This will exist separately from your clustered index (your primary key in this instance).
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