Transact SQL :: Value Of Adding Identity Primary Key On Table Where Search / Queries Will Not Use It?
Oct 12, 2015
I have a table of raw data where each column can be null. The thought was to create an identity key (1,1) and set as primary for each row. (name/ address / zip/country/joindate/spending) with surrogate key: "pkid".However other queries will not use this primary key. So for instance they may count the # of folks at a zip, select all names, addresses etc. The queries may order by join date, or select all the people that joined on a specific date.No other code would logically use the primary key (surrogate primary id key), therefore would it still have any performance benefits? at this time the table would have no clustured or nonclustured indexes or keys. I'm curious if there are millions of records.
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Aug 28, 2002
Hi all,
Can anyone suggest me on Adding primary key to a table which has already a primary key.
Thanks,
Jeyam
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Jan 28, 2012
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
Student_ind ON People_tbl.[Family ID] = Student_ind.[Family ID]
WHERE (People_tbl.LastName = @Enter_LastName) AND (People_tbl.FirstName = @Enter_FirstName)
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Jul 20, 2005
Hi all,How can get the primary key string from the given table name? i knowit should from system tables of "sysobjects, syscolumns, andsysconstraints", but when i execute the statement like that:select a.name from syscolumns a,sysobjects b,sysconstraints cwhere a.id = b.id and b.name ='Agreement' and a.id = c.id and a.colid= c.colid and c.status = 1i can't get the primary key out, what the trick here? bye the sql helpfile,'status' in sysconstraints table:1 = PRIMARY KEY constraint.2 = UNIQUE KEY constraint.what is exact value refers to PRIMARY KEY constraint?thanks,Robert
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Apr 26, 2008
Hi Friends,
I have a existing table named as activity, and have the column like ID,Description. I want to add the Identity for the ID column using script only.. Have any ideas how to do in sql query analyser?
Thanks in Advance
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Jul 20, 2005
I've got a table with 36+ million rows. I've been asked to modify thetable and add in an identity column. The code I used caused SQL tolock up and it maxed out the log files. :)The code I used is:Begin TransactionAlter Table ODS_DAILY_SALES_POSADD ODS_DAILY_SALES_POS_ID BigInt NOT NULL IDENTITY (1,1)CommitIs there a way to break up the code? Maybe only do a few millionrecords at a time? Or is there a way to do this without lockinganything up?Thanks,Jennifer
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Jan 21, 2014
I want to add new primary key into existing table which already has a primary key. But,I do not want to remove the old primary key, since there are many records and the old primary key also have relationship with other table
When I am using this query:
alter table hem154
add indexNO uniqueidentifier default newid()
alter table hem154
add CONSTRAINT pk_hem154_indexNo PRIMARY KEY (PK_indexNO)
go
Note:
Hem154 ~ Table name
indexNo ~ Column Name
I get this runtime error:
Msg 1779, Level 16, State 0, Line 1
Table 'hem154' already has a primary key defined on it.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
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Sep 11, 2006
I removed all constraints in order to load a bunch of data into a table, now I'm wondering if I can add an identity column to this table which does contain data or if I have to create a new table with the identity column and insert the data into that.
thx
Kat
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Sep 3, 2015
We want to add a new int identity column as a primary key to an already existing table that has a primary key on Guid. Here is the DDL:
CREATE TABLE [dbo].[VRes](
[VResID] [uniqueidentifier] NOT NULL,
[Mes] [varchar](max) NOT NULL,
[PID] [uniqueidentifier] NOT NULL,
[Segt] [int] NOT NULL,
[code]....
Also we currently have 3 million rows on this table. Is having an integer column as identity column and primary key better or shd I consider using BigInt?
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Nov 6, 2015
I have come up with one scenarios where I have three table like Product, Services and Subscription. I have to create one table say Bundle where I can have some of the product id , service id and Subscription id , i.e. a bundle may contains sum prduct , services and subscription . How I can design these relations ?
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Nov 20, 2013
I have created a table as below mentioned. Then I want to alter the ID column as identity(1,1) without dropping the table as well as losing the data.
create table dbo.IdentityTest
(
id int not null,
descript varchar(255) null,
T_date datetime not null
)
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Jun 5, 2015
I have a table (let's call it MyTable) that consists of four fields:
Id, Source, FirstField, and
SecondField, where Source only takes one of two values:
Source1 and Source2.
The records in this table look as follows:
Id
Source
FirstField
Secondfield
1
Source1
Product 3 name
Product 3 description
[code]...
I need to return, using 3 different T-SQL queries:
1) Products that exist only in Source2 (in red above)
2) Products that exist only in Source1 (in green above)
3) Products that exist both in Source1 and Source2 (in black above)
For 1) so far I've been doing something along the lines of SELECT * FROM MyTable WHERE Source=Source1 AND FirstField NOT IN (SELECT DISTINCT (FirstField) FROM MyTable WHERE Source=Source2)
I have read about INTERSECT and EXCEPT, but I am a little unclear if they could be applied in this case out of the box.
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Apr 29, 2015
Currently we have requirement like below.
Input @Filename ="233-sssee-FILENAMETYPE@ssss.xml"
In the DB i have column values like below.
FileType Val
FILENAMETYPE Direct
Now my requirement is to search for FIleTYPE in above table by passing @Filename as parameter and that should return Val as response. How to write a search query for this type.
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Oct 2, 2015
In a special request run, I need to update locker and lock tables in a sql server 2012 database, I have the following 2 table definitions:
CREATE TABLE [dbo].[Locker](
[lockerID] [int] IDENTITY(1,1) NOT NULL,
[schoolID] [int] NOT NULL,
[number] [varchar](10) NOT NULL,
[lockID] [int] NULL
CONSTRAINT [PK_Locker] PRIMARY KEY NONCLUSTERED
[Code] ....
The locker table is the main table and the lock table is the secondary table. I need to add 500 new locker numbers that the user has given to me to place in the locker table and is uniquely defined by LockerID. I also need to add 500 new rows to the corresponding lock table that is uniquely defined in the lock table and identified by the lockid.
Since lockid is a key value in the lock table and is uniquely defined in the locker table, I would like to know how to update the lock table with the 500 new rows. I would then like to take value of lockid (from lock table for the 500 new rows that were created) and uniquely place those 500 lockids uniquely into the 500 rows that were created for the lock table.
I have sql that looks like the following so far:
declare @SchoolID int = 999
insert into test.dbo.Locker ( [schoolID], [number])
select distinct LKR.schoolID, A.lockerNumber
FROM [InputTable] A
JOIN test.dbo.School SCH ON A.schoolnumber = SCH.type and A.schoolnumber = @SchoolNumber
JOIN test.dbo.Locker LKR ON SCH.schoolID = LKR.schoolID
AND A.lockerNumber not in (select number from test.dbo.Locker where schoolID = @SchoolID)
order by LKR.schoolID, A.lockerNumber
I am not certain how to complete the rest of the task of placing lockerid uniquely into lock and locker tables? Thus can you either modify the sql that I just listed above and/or come up with some new sql that will show me how to accomplish my goal?
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Apr 23, 2015
I've attempted to identify a primary and foreign key in these two tables, but I am getting a bunch of errors re duplicate keys and column names needing to be unique.Perhaps the primary and foreign key I have identified don't meet the criteria?
CREATE TABLE StockNames
(
-- Added Primary key to [stock_symbol]
[stock_symbol] VARCHAR(5) NOT NULL CONSTRAINT PK_stock_symbol PRIMARY KEY,
[stock_name] VARCHAR(150) NOT NULL,
[stock_exchange] VARCHAR(50) NOT NULL,
[code].....
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Apr 28, 2015
I am planning to add some new columns to an existing sql server 2012 table. I know that I need to use the alter statement to accomplish this goal. However my questions is the location of where I want to add the new columns to the table. It would make more sense to add the new columns to the middle of the table since these columns have a similar meaning as other columns in the middle of the table.However is it better to add these new columns at the end of the table? I am asking this question since I am thinking I might need some sql to move the values of existing columns and values around?Thus is it better to add new columns to a table in the middle of the table, at the end of the table, or at the end of the table? If so, can you tell me why one location is better than another location?
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Jun 2, 2015
I have student table where duplicate student exist by name with there fathers name and mothers name. I need to search those duplicate records. I do not need ti count them but If there is 5 same student with name then the query will show 5 name then I will delete individually. Below I am trying to show the scenario.
Student_name
_____________
Rocky
Albert
Rocky
Williams
Albert
Robert
The query will show
Student_name
______________
Rocky
Rocky
Albert
Albert
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Jul 17, 2015
Table 1:
------- ----- ---- ----
Name Add No RowID
------- ----- ---- -------
aa #a-1,India 10
bb #a-1,India 11
aa #a-1,India 12
----------------------------------------------------
table 1 inserting to Table 2 (Using 1st Data flow)
Table 2:
------- ----- ----
Name Add ID(Note:Here Identity1,1)
------- ----- ----
aa #a-1,India 1
bb #a-1,India 2
aa #a-1,India 3
----------------------------------------------------
My Requirement is Update Table 1 set Column::No=Table 2.ID
based on Exact Match of
Table1.Name=Table2.Name and
Table1.Add=Table2.Add
It means Get back the Id for Source Table 1
2nd Data flow
Source(Table1:Name, Add,No)
|
--LOOKUP(Table2:Name, Add::Matched Look Columns Name, Add and
Tick Mark on ID)
|(Match)
-->OLEDB Command: update Table1 set N0=? where RowID=?(Here Param_0= NO ,Param_1=RowID)
Here My Issue is if Table 1 had Duplicates(same Name, Add, but Row Id is different it is Updating Same ID for Table 1.No It means Get Back ID correctly not updating Result::
Table 1:
------- ----- ---- ----
Name Add No RowID
------- ----- ---- -------
aa #a-1,India 1 10
bb #a-1,India 2 11
aa #a-1,India 1 12
----------------------------------------------------
My correct Output is 3 instead of Result:Table1 1.NO 1 where RowID =12
It caused by LOOKUP , It picking Top1 ID while Matching Look on fields.
How Should I update the (Identity) Get Back Table 2.ID to Source Table1. NO in Above logic in SSIS?
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Apr 24, 2013
IF NOT EXISTS (SELECT TOP 1 1 FROM dbo.syscolumns WHERE id = OBJECT_ID(N'dbo.Employee) and name = 'DoNotCall')
BEGIN
ALTER TABLE [dbo].[Employee] ADD [DoNotCall] bit not null Constraint DoNot_Call_Default DEFAULT 0
IF ( @@ERROR <> 0 )
GOTO QuitWithRollback
END
It just takes a LOT of time in SQL Server Management studio. I have to cancel the query and cancelling takes a whole lot time. I am using SQL Server 2008.
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Feb 7, 2014
just trying to merge two scripts into one, but how to properly use the JOIN function, and just keep getting errors.
You'll no doubt recognise the tables, and what I'm trying to do.
Query 1;
COLUMN tablespace_name FORMAT A15
COLUMN "AVAIL" FORMAT 999,999,999,999
Select tablespace_name,
Sum(maxbytes/(1024*1024*1024)-bytes/(1024*1024*1024)) "AVAIL"
From dba_data_files
where tablespace_name like 'X%' OR tablespace_name like 'Y%'
Group By tablespace_name;
Query 2
COLUMN tablespace_name FORMAT A15
COLUMN "AVAIL" FORMAT 999,999,999,999
Select tablespace_name,
Sum(bytes/(1024*1024*1024)) "AVAIL"
From dba_free_space
where tablespace_name like 'X%' OR tablespace_name like 'Y%'
Group By tablespace_name;
Query 1 output;
TABLESPACE_NAME AVAIL
--------------- ----------------
X 8
Y 21
Query 2 output;
TABLESPACE_NAME AVAIL
--------------- ----------------
X 1
Y 11
I basically want to combine the two queries so I get an output of this;
TABLESPACE_NAME AVAIL
--------------- ----------------
X 9
Y 32
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May 9, 2008
Hi,
;WITH cte
AS
(
SELECT
SYMBOL,
[Time],
Price,
ROW_NUMBER() OVER(PARTITION BY CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) ORDER BY CAST(Time AS DATETIME) ASC) AS rn_1,
ROW_NUMBER() OVER(PARTITION BY CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) ORDER BY CAST(Time AS DATETIME) DESC) AS rn_2
FROM
Table1 WHERE SYMBOL='EUR A0-FX'
)
SELECT SYMBOL='EUR A0-FX',CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) AS [Time],MAX(CASE WHEN rn_2 = 1 THEN Price ELSE NULL END) AS [Close] FROM cte
GROUP BY
CONVERT(CHAR(5), CAST(Time AS DATETIME), 114)
ORDER BY
CAST(CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) AS DATETIME);
select a.symbol,a.TIME,a.CLOSE,avg(b.CLOSE1) as average,
CASE WHEN A.CLOSE>AVG(B.CLOSE) THEN 'BUY' ELSE 'SELL' END AS ACTION
from cte as a inner join cte as b on b.rn between a.rn - 5 and a.rn - 1
group by a.TIME, a.CLOSE
having count(distinct b.TIME) = 5;
I want to combine above two Queries. I am geeting error. Please Help me...
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Jun 21, 2007
Hi,
I have to queries that return tables with the same names. How do i add these 2 so it returns one table?
Thanks for your help.
Mike
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Aug 30, 2001
Im using
ALTER TABLE mytable ADD PRIMARY KEY(mycolumn)
I want to use a specific name like PK_mycolumn, how the heck is this done?
thanks!
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Nov 15, 2004
I confuse about Identity and primary key, what is the different between them. One table can have no primary key. Right? Thanks.
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Feb 1, 2006
Can someone tell me the difference between making a column primary key column vs. making it identity column?
thanks
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Oct 19, 2006
how can i change a column attribute using alter table in sql server 2005. i want to add an identity property to my column userid , which deosn't have an identity property defined when created.
i tried this.
alter table userlookup alter column userid int identity(1,1) not null
i got this error:
Incorrect syntax near the keyword 'identity'.
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Feb 6, 2008
In design mode of table, when i try to add identity, it is disabled.
These are disabled.
Precision
scale
identity
identity seed
identity increment
is rowguid
why identity is distabled in a table?.
So how can i add identity to a exsiting table?.
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Jan 24, 2008
I'm using SQL2005. I'm confused on why queries run slower after I add indexes to a table. I thought the system would pick the best index available when running select statements.
sys.dm_db_missing_index* and Tuning Advisor keep recommending indexes that make my system slower. Maybe they are making a few queries faster that I'm not aware of but I do know they makes some too slow. Now I have to document which indexes to avoid creating for each table.
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Mar 8, 2004
Hello,
I am relativley new to SQL and have a question about identity fields.
I am creating a script to run everynight to insert records into a support table in a database. one of the fields is a identity field that is updated everytime a record is added locally or over the web.
Some records that are added into the database locally by users do not get added into theis support table, but so those new people entered in can use the website a entry must be added to this support table.
I am working on a script to take the records that where added by users and automatically put them in every night using a basic schedueled job.
The identy number is updated everynight in a table that collects all the important identiy numbers. I would like to use this table to alter the seed value and then increment by one every time a new record is added. This is my only sticking point so far.
Any help would be greatly appreciated.
Kenn Brown
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Jan 22, 2007
What is the different between Primary key and Identity Column? and when should I them?
(Im just a beginner with databases...)
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Mar 17, 2007
I orginally had my project ID specified as an Int and the properties set as identity specification that would automatically fill in the ID field however I have now changed it as the ID needs to be specified by the user but now when i update a project the ID isnt seen as the identity so whatever i do affects other records not just the one i select.
it is now defined as an nvarchar but i dont know how to set that as the identity so that each record can be edited seperately, can someone please help this is really urgent!!
Im using visual web developer express with sql server, please please help!
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Jan 21, 2008
I want to crete temporary table with this coammnd "CREATE TABLE Temp (ID int, name varchar(50))". I would like to know which command is used for setting primary key and identity on ID field. Thankyou in advance.
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Jan 8, 2004
I have some code in my ASP.NET page which uses a SQL 2000 Database that was created before creating the ASP Page. The problem I'm having is using an insert statement such as the following example from the DATAGRID example on the Matrix Product. I want the option to create new rows but my Primary Key doesn't allow Nulls and when I hard code a number in the first field of my table for my ID...it's not automatically generated. I've looked through this forum but I'm having some problems understanding what others have done with Identity or GUID's...etc....:
Sub AddNew_Click(Sender As Object, E As EventArgs)
' add a new row to the end of the data, and set editing mode 'on'
CheckIsEditing("")
If Not isEditing = True Then
' set the flag so we know to do an insert at Update time
AddingNew = True
' add new row to the end of the dataset after binding
' first get the data
Dim myConnection As New SqlConnection(ConnectionString)
Dim myCommand As New SqlDataAdapter(SelectCommand, myConnection)
Dim ds As New DataSet()
myCommand.Fill(ds)
' add a new blank row to the end of the data
Dim rowValues As Object() = {"", "", ""}
ds.Tables(0).Rows.Add(rowValues)
' figure out the EditItemIndex, last record on last page
Dim recordCount As Integer = ds.Tables(0).Rows.Count
If recordCount > 1 Then
recordCount -= 1
DataGrid1.CurrentPageIndex = recordCount DataGrid1.PageSize
DataGrid1.EditItemIndex = recordCount Mod DataGrid1.PageSize
End If
' databind
DataGrid1.DataSource = ds
DataGrid1.DataBind()
End If
End Sub
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