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Update a table foreign keys by substituting by a lookup from the result of another table


Update a table foreign keys by substituting by a lookup from the result of another table

By : user2953503
Date : November 21 2020, 01:01 AM
I hope this helps . You can use a update statement with a lookup like below, by using an inner lookup subquery which in turn uses the TRIM function to strip out the leading zeroes during matching. We also restrict the update to just those Names linked to OriginalDealer records starting with 00000 to mimimize the risk of unnecessary updates.
code :
UPDATE Names SET ID_NUM = 
(SELECT od1.ID
 FROM OriginalDealer od1
      INNER JOIN OriginalDealer od2
      ON od1.EName = TRIM(LEADING '0' FROM od2.EName)
 WHERE od2.ID = Names.ID_NUM)
WHERE EXISTS
(
  SELECT 1
  FROM OriginalDealer od
  WHERE od.ENAME LIKE '00000%'
  AND Names.ID_NUM =  od.ID
);


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Should Lookup Table Foreign Keys Always be Indexed?

Should Lookup Table Foreign Keys Always be Indexed?


By : TAllen Weav
Date : March 29 2020, 07:55 AM
To fix this issue On a transactional system there may be no significant benefit to putting an index on such a column (i.e. a low cardinality reference column) as the query optimiser probably won't use it. It will also generate additional disk traffic on writes to the table as the indexes have to be updated. So for low cardinality FK's on a transactional database it is usually better not to index the columns. This particularly applies to high volume systems.
Note that you may still want the FK for referential integrity and that the FK lookup on a small reference table will probably generate no I/O as the lookup table will almost always be cached.
Using Nested models on MVC 3: How to update a table inside a table? (Foreign Keys)

Using Nested models on MVC 3: How to update a table inside a table? (Foreign Keys)


By : Yosep mr engineer Ki
Date : March 29 2020, 07:55 AM
I hope this helps . I don't have Visual Studio installed on this PC so I wasn't able to test this...
Assuming you are using the Entity Framework Code First approach, your NutritionalEvaluation class doesn't have a foreign key relationship to your PatientAppointment class. Assuming there is a 1-1 relationship, change NutritionalEvaluation to:
code :
public class NutritionalEvaluation
{
    [ScaffoldColumn (false)]
    public virtual int ID { get; set; }

    // This is the name of the navigation property defined below
    [ForeignKey("PatientAppointment")]
    public virtual int AppointmentID { get; set; }

    public virtual int KiloCal { get; set; }
    public virtual int Proteines { get; set; }
    public virtual int Carbs { get; set; }
    public virtual int Fiber { get; set; }
    public virtual int Fats { get; set; }
    public virtual int Cholesterol { get; set; }
    public virtual int Water { get; set; }
    public virtual int Alcohol { get; set; }

    // Add navigation property to PatientAppointment
    public virtual PatientAppointment PatientAppointment { get; set; }
}
How to update primary key values of first table into foreign keys in the second table (Entity framework code first model

How to update primary key values of first table into foreign keys in the second table (Entity framework code first model


By : DrSmiley
Date : March 29 2020, 07:55 AM
will help you I have fetched the Person from database in person object and added to its Memberships collection...
code :
person.Memberships = new List<Membership> { m };
SQL Select Text for multiple foreign keys to lookup table in same row

SQL Select Text for multiple foreign keys to lookup table in same row


By : Abdellah Benrebea
Date : March 29 2020, 07:55 AM
help you fix your problem You can join on the status table multiple times - something like this:
code :
select i.item_id, 
    i.old_status, 
    i.new_status,
    i.timestamp,
    s1.statustext,
    s2.statustext
from items i
    join status s1 on i.old_status = s1.statusid
    join status s2 on i.new_status = s2.statusid
Entity Framework - How to Insert to table with foreign keys without retrieving foreign table rows first

Entity Framework - How to Insert to table with foreign keys without retrieving foreign table rows first


By : maruthi Chitti
Date : March 29 2020, 07:55 AM
To fix the issue you can do You can just include foreign key properties in addition to the navigation properties and then set them using the ids you have. If you do this will not have to go to the database to get related entities for just a sake of setting the relationship.
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