I have three history tables as shown below for the corresponding main table and one audit table . The table are related with each other with primary key id in table.
com
-----
id - primary key
description
history_id
db_comm
--------
id - refers id in com
query
type
flag
history_id
comm_frm
-------
id - refers id in com
scope
status
seq
history_id
audit
------
history_id
version_id
created_dt
replaced_dt
ended_dt
userId
ipaddr
action
status
I have created history table(_history) for these three tables. For any change(insert/update/delete) in any one of these three tables
do i need to duplicate the rows in other table, even if there is no
change in that table.
for example
if the user has modified column query in comm table. then i will have following entry in these history tables.If you see here the com table is only changed ,but do we need to make a new entry in db_comm also.
com_history
id description history_id
1 loaded data 1
1 loaded 3
db_comm_history
id scope sequence history_id
1 G 1 2
1 G 1 4
audit
history_id version_id created_dt replaced_dt ended_dt userId ipaddr action status
1 1 sysdate sysdate sysdate xxx 192.1 Update INACTIVE
2 2 SYSDATE XXX 192.1 iNSERT ACTIVE
3 1 sysdate sysdate sysdate xxx 192.1 Update INACTIVE
4 2 SYSDATE XXX 192.1 iNSERT ACTIVE
how do i maintain same version(global version) in all the history tables for a change in one of the table.
Related
I have a table called Customer that has several columns called National Code and Name. It also has a number of other features called Contact Numbers and Recommenders, since the number of Contact Numbers and Recommenders is more than one, so you need some other table to store them.
Also suppose I have other tables like the Customer, each of which has a number of attributes greater than one.
What is your suggestion for storing these values?
In one source, it was suggested that for each table, a table called StringValue be used for storage. Does EF core have a way to implement StringValue without writing additional code?
Example:
Customer Table:
CustomerId Name NationalCode
------------------------------------------------------------------------
1 David xxxx
------------------------------------------------------------------------
StringValue Table:
StringId CustomerId StringName Value
------------------------------------------------------------------------
10 1 PhoneNumber 915245
11 1 PhoneNumber 985452
12 1 PhoneNumber 935446
13 1 Recommenders Mr Jhon
14 1 Recommenders Mr bb
------------------------------------------------------------------------
I think it is more intutive create a new table for the field which has more than one records, then configure a one-to-many relationship between the two tables. Take your case as an example, you can divide the customer table into three tables, they can be linked by foreignkey:
1.Customer Table:
CustomerId Name NationalCode
---------------------------------------------
1 David xxxx
2.Contact Table:
Id CustomerId PhoneNumber
---------------------------------------------
1 1 915245
2 1 985452
3 1 935446
3.Recommender Table:
Id CustomerId RecommenderName
---------------------------------------------
1 1 Mr Jhon
2 1 Mr bb
I have a mapping that gets data from multiple sql server source tables and assigns a sequence generated number as ID for each rows. In the target table, the ID field is set as primary key.
Every time I run this mapping, it creates new rows and assigns a new ID for the records that are pre-existing in the target. Below is an example:
1st run:
ID SourceID Name State
1 123 ABC NY
2 456 DEF PA
2nd run:
ID SourceID Name State
1 123 ABC NY
2 456 DEF PA
3 123 ABC NY
4 456 DEF PA
Desired Output must:
1) create a new row and assign a new ID if a record gets updated in the source.
2) create a new row and assign a new ID if new rows are inserted in the source.
How can this be obtained in Informatica?
Thank you in advance!
I'll take a flyer and assume the ACTUAL question here is 'How can I tell if the incoming record is neither insert nor update so that I can ignore it'. You could
a) have some date field in your source data to identify when the record was updated and then restrict your source qualifier to only pick up records which were last updated after the last time this mapping ran... drawback is if fields you're not interested in were updated then you'll process a lot of redundant records
b) better suggestion!! Configure a dynamic lookup which should store the latest state of a record matching by the SourceID. Then you can use the newlookuprow indicator port to tell if the record is an insert, update or no change and filter out the no change records in a subsequent transformation
Give the ID field an IDENTITY PROPERTY...
Create Table SomeTable (ID int identity(1,1),
SourceID int,
[Name] varchar(64),
[State] varchar(64))
When you insert into it... you don't insert anything for ID. For example...
insert into SomeTable
select
SourceID,
[Name],
[State]
from
someOtherTable
The ID field will be an auto increment starting at 1 and increment by 1 each time a row is inserted. In regards to your question about adding rows each time one is updated or inserted into another table, this is what TRIGGERS are for.
I've deleted some records (more precisely row 4) from a table in a SQL Server database. Now the first column goes like this (1,2,3,5) without row 4:
ID Name
------------
1 Luk
2 Sky
3 Philips
5 Andrey
How can I recreate this table and insert all data again in appropriate order?
Like this:
ID Name
--------
1 Luk
2 Sky
3 Philips
4 Andrey
EDIT:
But if i have another column (number) that is not a key, like this:
ID Number Name
------------
1 1 Luk
2 2 Sky
3 3 Philips
5 5 Andrey
Then can i recreate column Number and Name,
ID Number Name
------------
1 1 Luk
2 2 Sky
3 3 Philips
5 4 Andrey 'Can i do this, and if can HOW?
I would make a pretty strong case for never storing this number, since it is calculated, instead you could just create a view:
CREATE VIEW dbo.YourView
AS
SELECT ID,
Number = ROW_NUMBER() OVER(ORDER BY ID),
Name
FROM dbo.YourTable;
GO
This way after you have deleted rows, your view will already be in sync without having to perform any updates.
If you need to store the value, then almost the same query applies, but just placed inside a common table expression, which is then updated:
WITH CTE AS
( SELECT ID,
Number,
NewNumber = ROW_NUMBER() OVER(ORDER BY ID)
FROM dbo.YourTable
)
UPDATE CTE
SET Number = NewNumber;
You can use dbcc command
DBCC CHECKIDENT('tableName', RESEED, 0)
It would reset identity to 0.
Note it would require to truncate table first.
You can make the ID to auto increment which by default, the starting value for AUTO_INCREMENT is 1, and it will increment by 1 for each new record.
E.g MSSQL uses IDENTITY keyword to auto increment whereas MySQL uses the AUTO_INCREMENT keyword to perform an auto-increment feature.
MSSQL
ID int IDENTITY(1,1) PRIMARY KEY
MySQL
ID int NOT NULL AUTO_INCREMENT
Say I have a User database table with the regular username, password, email fields. What is a sensible way to add additional boolean fields that enable/disable features for any given user.
e.g.,
user_can_view_page_x
user_can_send_emails
user_can_send_pms
etc
Adding a bunch of boolean columns to the existing user table seems like the wrong way to go.
Yes, I would think that this is the wrong approach.
I would rather create a
User_Features Table
with columns something like
UserID
FeatureName
And check if a given user has the feature in question enabled/entered in the table.
You could even go as far as creating a Users_Groups table, where users are also assosiated with groups and features can be inherited/disallowed from group settings.
I would use three tables.
One is your existing user table:
USER table
----
user_id (pk)
name
email
...
Another is a table containing possible user privileges:
PRIVILEGE table
----
privilege_id (pk)
name
Lastly is a join table containing an entry for each privilege setting for each user:
USER_PRIVILEGE table
----
user_id (pk) (fk)
privilege_id (pk) (fk)
allowed
Here is some sample data for two users, one with the send email privilege and the send pms privilege and another with a view page privilege:
USER data
USER_ID NAME EMAIL
------- ----- -------------------
1 USER1 user1#somewhere.com
2 USER2 user2#somewhere.com
PRIVILEGE data
PRIVILEGE_ID NAME
------------ -----------
1 view_page_x
2 send_email
3 send_pms
USER_PRIVILEGE data
USER_ID PRIVILEGE_ID ALLOWED
------- ------------ -------
1 1 'N'
1 2 'Y'
1 3 'Y'
2 1 'Y'
2 2 'N'
2 3 'N'
I have 2 MS Access Tables.
Table 1
id
room-name
Table 2
wall
cupboard
ceiling
Now... table1.room-name has the room names and table2 contains object (many) so each room name contains many objects.
My question is ... How do I set the relationships for this please?
Nothing in table 2 tells you what room things are in so you need to add a foreign key of the room to the primary key of table 1. In this case either column of table1 could be its primary key - I would use room- name and drop the id.
So table2 needs altering so that room-name is in it and the draw the connection from table1 to table2.
Something like:
[Room]
RoomId eg 1 2
RoomName eg bedroom kitchen
[RoomItem]
RoomItemId eg 1 eg 2 eg 3
RoomId eg 1 eg 1 eg 2
ItemName eg wardrobe eg bed eg cooker
Where the RoomId links the Room and RoomItem tables.