Sql Table Data Stroring Based On Varchar Primary Key

Jan 17, 2008

Hi,

I have a Users table that I use for membership. I am using username varchar(30) as the primary key for this table since username will always be unique.

The question I have is regarding how SQL Server actually stores data:

I see that when I add users, they are always stored alphabetically sorted on username.

I was expecting that all users will appear on the users table in the order they were added.

Example: I have 3 users (john, jonah, wilson). Now I added 4 user with username='bob'

If I execute select * from users, it returns me (bob, john, jonah, wilson). Look bob has become the first row of the table.

My question: Is Sql server moving 3 older rows to make room for 'bob' and it is also rebuilding part of the index due this new username 'bob'?

If this is the case, then it will have big impact if I have 100K users and I add one user that becomes firstrow. In that case 99,999 rows will have to move.

Bottom line, insert, delete will be very expensive.

I know sql server keeps data physically sorted on PK. But I am concerned here since rows are losing the order in which they were inserted.

Thanks

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Table Primary Key(Varchar) Table Question

Jan 17, 2008

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I need to add a child table that will tell us who the participants counselor is, what I did was I did a Make Table query based off the primary key of the Parent table and made that the link (foreign key) for the People_tbl and the Counselor_tbl, so if the counselor changes then the user adds the record to the counselor tbl and then puts in the Effective date. The problem is that when I run a report it doesn't show the present counselor always shows the old counselor?

Code:
SELECT Student_ind.StudentFirstName, Student_ind.StudentLastName, Student_ind.[Student ID], People_tbl.[Family ID], People_tbl.FirstName,
People_tbl.LastName, People_tbl.[Parent ID]
FROM People_tbl RIGHT OUTER JOIN
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Here is my code:

CONVERT(varchar(20), CONVERT(date, CONVERT(varchar(8), date_added), 112),110) = dateadd(day,datediff(day,1,GETDATE()),0)

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We are facing few issues pertaining to creation of primary key on a non - partitioned column in sql server 2005. Herewith attaching the text file containing the detailed scenario.

Pls advice.

Pls find some of the scenario with the example given below:

We have done the following steps
1.Creating a Partition Function
CREATE PARTITION FUNCTION pf_EncounterODS_StateID (CHAR(2))
AS RANGE RIGHT FOR VALUES
(
'CA', -- CA
'MI', -- MI
'NM', -- NM
'OH', -- OH
'TX', -- TX
'UT', -- UT
'WA' -- WA
)
GO
2.Creating a Partition Schema
CREATE PARTITION SCHEME [ps_EncounterODS_StateID]
AS PARTITION pf_EncounterODS_StateID TO
(
[PRIMARY],
[ENC_DM_DATA_01], -- CA
[ENC_DM_DATA_03], -- MI
[ENC_DM_DATA_04], -- NM
[ENC_DM_DATA_05], -- OH
[ENC_DM_DATA_06], -- TX
[ENC_DM_DATA_07], -- UT
[ENC_DM_DATA_02] -- WA
)
GO

3.Creating a table using above partitioned schema

CREATE TABLE [dbo].[Fact] (
[ValidationErrorSID] [bigint] NOT NULL IDENTITY(1,1),
[ProcessID] [int] NULL ,
[StateID] [char] (2) NOT NULL ,
[ClaimID] [char] (15) NULL ,

) ON [ps_EncounterODS_StateID](StateID)

4.Creating a primary key on validationErrorSID column in the fact table
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Step 4 throws an error as
---------------------------------
Column 'StateID' is partitioning column of the index 'NQValidationError'. Partition columns for a unique index must be a subset of the index key.
If we include StateID along with ValidationErrorSID for index,then it works fine.But we need to have only ([ValidationErrorSID]) for indexing.

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Mar 15, 2014

-- My first Data

create table #myfirst (id int, city varchar(20))
insert into #myfirst values (500,'Newyork')
insert into #myfirst values (100,'Ediosn')
insert into #myfirst values (200,'Atlanta')
insert into #myfirst values (300,'Greenwoods')
insert into #myfirst values (400,'Hitchcok')
insert into #myfirst values (700,'Walmart')
insert into #myfirst values (800,'Madida')

-- My Second Data

create table #mySecond (id int, city varchar(20),Sector varchar(2))
insert into #mySecond values (1500,'Newyork','MK')
insert into #mySecond values (5500,'Ediosn','HH')
insert into #mySecond values (5060,'The Atlanta','JK')
insert into #mySecond values (7500,'The Greenwoods','DF')
insert into #mySecond values (9500,'Metro','KK')
insert into #mySecond values (3300,'Kilapr','MK')
insert into #mySecond values (9500,'Metro','NH')

--Third Second Data

create table #myThird (id int, city varchar(20),Sector varchar(2))
insert into #myThird values (33,'Walmart','PP')
insert into #myThird values (20,'Ediosn','DD')
select f.*,s.Sector from #myfirst f join #mySecond s on f.city = s.city
/*
idcitySector
500NewyorkMK
100EdiosnHH
*/

i have doubt on two things

1) How Can i compare the City names, by eliminating 'The ' at the beginning (if there is any in second tale city) between first and second

2) after comparing first and second if there is no match found in second them want to compare with third table values for those not found

--i tried below to solve first doubt, it is working but want to know any other wasys to do it

select f.*,s.Sector from #myfirst f join #mySecond s on replace (f.city, 'THE ','')= replace (s.city, 'THE ','')

--Expected results wull be

create table #ExpectResults (id int, city varchar(20),Sector varchar(2))
insert into #ExpectResults values (200,'Atlanta','JK')
insert into #ExpectResults values (100,'Ediosn','HH')
insert into #ExpectResults values (300,'Greenwoods','DF')
insert into #ExpectResults values (500,'Newyork','MK')
insert into #ExpectResults values (700, 'Walmart','PP')
insert into #ExpectResults values (800, 'Madidar','')

[code]....

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Hi,

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Hello Friends,

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Code Block
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Edit:
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SQL Server 2012 :: Define Primary Key Based On 2 Columns?

Sep 24, 2014

I've two tables A, B. In A table, I need to define the primary key with combination of 2 columns and this Primary Key will be a foreign key in table B. Based on these PK and FK I'll be writing a join to get the second column in table B.

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