Making 2 Columns Unique With Each Other

Feb 21, 2008

Hi Guys,
 
I came here again to ask something about my application, Is there a way to make 2 columns unique with each other even if they don't have a primary key? If there's a way how? I wanna make a rule so, my application wont replicate its record.
 
 
 
Graciaz,
Nhoyti 

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Making Single Column Value To Multiple Columns

Mar 4, 2008

I have a table which has single column like this.


REP5426 02-28-08 0592 00100028 CAFE 00205415 23.77 A O INPUT
REP5426 02-28-08 0592 00100028 CAFE 00580910 475.58 A O INPUT

REP5426 02-28-08 0592 00100028 CAFE 00800840 -13.32 A O INPUT

REP5426 02-28-08 0592 00100028 CAFE 00205416 23.77 A O INPUT

I want to put this in a new table in individual columns

Col1 col2 col3 col4 col5 col6 col7 col8 col9

REP5426 02-28-08 0592 00100028 CAFE 00205415 23.77 A O INPUT
REP5426 02-28-08 0592 00100028 CAFE 00580910 475.58 A O INPUT

REP5426 02-28-08 0592 00100028 CAFE 00800840 -13.32 A O INPUT

REP5426 02-28-08 0592 00100028 CAFE 00205416 23.77 A O INPUT

How to do this.
Thanks.

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Feb 13, 2004

I use the identity = yes for my unique columns in most of my tables that need it. I am trying to decide if I should change identity = no, and instead manually update my unique number column myself by adding one when I insert new rows.

The reason I want to do this is for maintainabilty and ease of transfering data for backup to other sql servers. I always have trouble keeping the identity numbers to stay the same as they are in the original database because when they are transfered to a db that has identity = yes, the numbers get rearranged.

It will also make it easier to transfer data from original db to another sql server db and use the data right away without having to configure the destination db to disable identity and then enable it, etc.

Any pro's con's appreciated,

Dan

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Mar 20, 2013

I have result set as the attached in screenshot, where the candidateid gets duplicated, but then the column university and careerchoice column has different values for the same candidate. (the CareerChoice and University comes from different tables and i have used union clause)

What want is e.g. CandidateId 186 repeats three times, it should be one row, with three columns all filled with the values which are in different rows.

So that I don't have duplicate candidate ids and i have single row with all column data.

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Apr 19, 2013

I find to be able to have multiple NULL entries in the following constraint:

Code:

CREATE UNIQUE INDEX my_uidx ON my_table(my_col1,my_col2) WHERE ??? IS NOT NULL;

But is not possible to check multiple columns in "WHERE".

I using SQL Server 2012 Express

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Mar 7, 2006

Hi i am designing a database. It will be used by field guys who will insert new records and will replicate at the end of the day with a central database using merge replication. Can anyone tell me if I am choosing wisely or not with the following 3 points:
1. i am going to use a uniqueidentifier value in a column (using newid()) for the merge replication. (I don't care that it's an ugly value as i never plan to look at it.

2. I am using an identity column (INT)to create a unique value within the table

3. I want to create a unique column comprising of data from other columns (e.g. date+identity+salesrep) This gives me an intelligent candidate for a primary key. But I think i have to create this with an instead of trigger (is that right)

many thanks in advance

ICW

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May 17, 2007

Using DISTINCT with SELECT have effect only for one column.
But when is needed to select (or to count) queries for all rows for all columns in a table without duplicates, doesn't work.

Select DISTINCT a1,a2,a3,a4 From Y ---> results 167 rows
Select DISTINCT a4 From Y ---> " 85 rows

Any thoughts?


Jorge3921

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Could Not Create A Foreign Key On 2 Unique Columns

Feb 12, 2006

Hello.
Could anyone tell me why it is not possible to create a foreign key on two columns those references on 2 columns in another table? Those 2 columns have each a unique constraint.

I have:
CREATE TABLE T_PK (ID1 INT CONSTRAINT CHK_UNIQUE1 UNIQUE,ID2 INT CONSTRAINT CHK_UNIQUE2 UNIQUE)

CREATE TABLE T_FK (ID1 INT, ID2 INT)

And I want to do:

ALTER TABLE T_FK ADD CONSTRAINT CHK_FK FOREIGN KEY (ID1, ID2) REFERENCES T_PK (ID1,ID2)

I see no reason why this is not working because always
a row in the table T_FK referencing only one row in table T_PK.

Thank you.
Have a nice day.

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Unique Index On X Columns But Not Primary Key

Feb 23, 2006

my table :

CREATE TABLE [dbo].[users] (
[ID] [int] NOT NULL ,
[A1] [nvarchar] (100) NULL ,
[A2] [nvarchar] (100) NULL ,
[A3] [nvarchar] (100) NULL
) ON [PRIMARY]

i must keep ID columns as primary key

ALTER TABLE [dbo].[users] WITH NOCHECK ADD
CONSTRAINT [PK_users] PRIMARY KEY CLUSTERED
(
[ID]
) ON [PRIMARY]


but now A1+A2 must be unique

how can i do it ?

thank you

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Merge Tables On Unique Key Using Different Columns

May 15, 2008

hi guys,

i have 3 tables (T1, T2, T3), each with the same structure:
ID1 -> char(10)
ID2 -> char(12) NULL
ID3 -> char(10)
Value1 -> money
Value2 -> money
Value3 -> money
Note1 -> Text
Note2 -> Text

ID1+ID2+ID3 is the clusterd unique key in each table

what i want:
ID1, ID2, ID3 (with distinct occurencies of all 3 tables), T1.Value2, T2.Value2, T2.Value3, T3.Value1, T3.Note1

what i tried is to get all possible rows with

SELECT ID1,ID2,ID3 FROM T1
UNION
SELECT ID1,ID2,ID3 FROM T2
UNION
SELECT ID1,ID2,ID3 FROM T3

but i dont know how to join or add the other columns. maybe with

WITH RowList (ID1,ID2,ID3) AS ( ... code above.... ) SELECT ...


any ideas?
thx

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Oct 31, 2005

Can you create a unique constraint on multiple columns, or does it haveto be implemented as a unique index?If possible can someone please post some sample code?Thanks,

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Jul 20, 2005

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Feb 9, 2007

Perhaps one too many 2000 DTS packages have permanently damaged my ability to think clearly - however, I've find myself very frustrated attempting to create a SSIS Data Flow which replaces a very simple 2000 DTS package.

Take data from table1 in database1, put it in table2 in database2. Table2 in Database2 has an additional column as part of the primary key - so I need to add an arbitrary unique value in each row as it's inserted. Previously, I did this in the transformation script through a variable I incremented.

What's the recommend method to do this now - since row level processing of variables seem to be a no-no?

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May 31, 2007

In tables where reporting or historical information needs to be maintained I find that logical deletion of rows is better than actually deleting the row and any FK relationships. However when one of the columns in the table must be unique this introduces a problem because uniqueness only matters for "active" rows. I'm hoping someone can provide some advice on how to best handle this situation.



Here is an example to work from. Suppose we have a table that contains job positions. The table contains an IDENTITY column for the PK (to avoid duplicating position names), a Name column that must be unique and an IsActive column that is set to 0 when the position has been "deleted". This setup allows for historical reporting to properly pick up the position information even though it might no longer be used in a company. You can substitute your own scenarios here as there are quite a few.



Now if the Name column is marked as a unique column then the DB will enforce integrity which is what we want. However we will want to be able to "delete" a position but later add a new position with the same name. One could argue that we should just "undelete" the original position but that is not often a good idea so assume "undelete" is not an option. Given the unique constraint a new position could not be created if an existing position (active or otherwise) already existed with the same name. We could set up the unique constraint to include the Name and IsActive columns but now we are prevented from ever deleting two positions with the same name.



My initial thought is to create a new UniqueName column that is unique and remove the uniqueness constraint on the Name column. The UniqueName column is set (via a trigger) to the Name column when the position is active. When the position is deleted the trigger changes the UniqueName to include a timestamp or something to ensure uniqueness. This is handled by the system and not exposed to clients.



Any advice or alternatives on this approach (preferably with advantages and disadvantages)? Thanks.



Michael Taylor - 5/31/07

http://p3net.mvps.org

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Aug 14, 2006

We have an app that threads together emails coming out of Exchange, using their messageid. To ensure threading works correctly, we need to ensure uniqueness of messageid, which we do with a unique index (we also need to be able to lookup by messageid when a message comes in).

We are currently porting the app from Oracle and PostgreSQL to SQL Server and are having problems with the 900 byte max length of an index. The problem is that the maximum size of a messageid (according to the Exchange docs) is 1877 bytes.

How can we guarantee uniqueness?

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Mar 18, 2007

Hi there, im still learning SQL so thanks in advance.I have a table with columns of customer's information, [customerID], [customerFirst], [customerLast], , [program] ... other columns ...  There will be entries where there can be duplicate customerFirst and customerLast names.  I would like to just return a single entry of the duplicate names and all associated row information.  IE: [customerID], [customerFirst], [customerLast],            [ email],             [program]         01               Bill                 Smith             bill.smith@hotmail.com    ymca        02               Bill                 Smith             bill.smith@hotmail.com    Sports        03               jon                   doe                 jon.doe@hotmail.com    AAA        04               jon                   doe                 jon.doe@hotmail.com    Ebay          05               Paul                 Sprite             paul.sprite@hotmail.com    Rec Desired Returned result:        01               Bill                 Smith             bill.smith@hotmail.com    ymca        03               jon                   doe                 jon.doe@hotmail.com    AAA
         05               Paul                 Sprite             paul.sprite@hotmail.com    Rec So in my code i have this:dAdapter = new SqlDataAdapter("SELECT * FROM [Poc_" + suffix + "] WHERE (SELECT DISTINCT [CustomerLastName], [CustomerFirstName], [CustomerEmail] FROM [Poc_" + suffix + "])", cnStr);         dAdapter.Fill(pocDS, "Data Set");        However this is throwing up an error when i build the app:  An expression of non-boolean type specified in a context where a condition is expected, near ')'.



Description: An
unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the
error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException:
An expression of non-boolean type specified in a context where a
condition is expected, near ')'.

Source Error:




Line 52: //dAdapter = new SqlDataAdapter("SELECT DISTINCT * FROM [Poc_" + suffix + "] ORDER BY [CustomerLastName]", cnStr); Line 53: dAdapter = new SqlDataAdapter("SELECT * FROM [Poc_" + suffix + "] WHERE (SELECT DISTINCT [CustomerLastName], [CustomerFirstName], [CustomerEmail] FROM [Poc_" + suffix + "])", cnStr); Line 54: dAdapter.Fill(pocDS, "Data Set");Line 55: Line 56: //Dataset for name comparison  1: Can someone explain to me why this error is happening?2: Can soemone confirm that my intentions are correct with my code?3: If I'm completely off, can someone steer me in the right direction?Thanks alot!-Terry  

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Jan 19, 2008

Hello, I will explain myself further. I want to make my table in such a way that no two colums have the same value for example:
Row 1 - Column 1 = "cool"
Row 1 - Column 3 = 91
Row 3 - Column 1 = "cool"
Row 3 - Column 3 = 91
 
I dont care about one column having duplicate values, I want to protect against  Column 1 and 3 having the same values on other rows. Is this possible to do in sql server?

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Dec 30, 2004

I try to search my data and sort the result by importance.

I'm using a MS Access database and my data (table1) looks like this:


Code:

ID NAME TEXT
1 Apples Good red apples
2 Bananas Fine yellow bananas
3 Yellow apples Great yellow apples


I want to search the data and get a result where the column "NAME" is more important than "TEXT". My SQL looks like this:


Code:

SELECT id,name,text,1 AS searchorder FROM table1 WHERE name LIKE '*yellow*'
UNION
SELECT id,name,text,2 AS searchorder FROM table1 WHERE text LIKE '*yellow*'
ORDER BY searchorder


The output is this:


Code:

ID NAME TEXT SEARCHORDER
3 Yellow apples Great yellow apples 1
2 Bananas Fine yellow bananas 2
3 Yellow apples Great yellow apples 2


So far so good - the order by importance works - but I do not get unique columns because of the searchorder column.

Can I fix my SQL so I get unique columns where the last line of "Yellow apples" does not appear or am I lost in space?

Best regards,
Peter from Denmark

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Jun 20, 2008

Hi Guys.

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For Example:

This is what I want

ID Column1 Column2
--- -------- ---------
1 5 8
2 5 7
3 null 10
4 6 2


This is what I DO NOT want:

ID Column1 Column2
--- -------- ---------
1 5 5
2 5 5
3 7 7
4 null null


I created a unique constraint between the 2 columns, but it still allows dups within the row. Please help me.

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Apr 18, 2014

write a query which retrieves only unique rows excluding some columns.

IdStatusmanager Team Comments Proj number Date
19391New XUnassigned One 3732.0 16-Apr-14
19392Can YCustomer Two 3732.0 17-Apr-14
19393Can YCustomer Two 3732.0 17-Apr-14
19394Can YCustomer One 3732.0 18-Apr-14
19395New YCustomer One 3732.0 19-Apr-14
19396New YCustomer One 3732.0 21-Apr-14
19397New ZCustomer One 3732.0 20-Apr-14

In the above table project number and id shouldn't be considered and I should get the unique rows considering rest of columns and sorted based on date. Expected result is

IdStatusmanager Team Comments Proj number Date
19391New XUnassigned One 3732.0 16-Apr-14
19392Can YCustomer Two 3732.0 17-Apr-14
19394Can YCustomer One 3732.0 18-Apr-14
19395New YCustomer One 3732.0 19-Apr-14
19397New ZCustomer One 3732.0 20-Apr-14
19396New YCustomer One 3732.0 21-Apr-14

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Oct 19, 2015

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I want to generate the username field using above columns, so lets consider, I have following data

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a                    b                  cdef
a                    b                  cdfg
a                    b                  cdfj

Expected Usernames:

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2: a.b.c
3. a.b.cd

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This index is not unique

ix_report_history_creative_id

Msg 2601, Level 14, State 1, Procedure DFP_report_load, Line 161
Cannot insert duplicate key row in object 'dbo.DFP_Reports_History' with unique index 'ix_report_history_creative_id'.

The duplicate key value is (40736326382, 1, 2015-07-03, 67618862, 355324).
Msg 3621, Level 0, State 0, Procedure DFP_report_load, Line 161

The statement has been terminated.

Exception in Task: Cannot insert duplicate key row in object 'dbo.DFP_Reports_History' with unique index 'ix_report_history_creative_id'. The duplicate key value is (40736326382, 1, 2015-07-03, 67618862, 355324).

The statement has been terminated.

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