I need to update a SQL Server table periodically by inserting new records into it.
The table has an ID column in the form of Company0001 through Company0020 right now.
Let's say I added one record of a new company into the table. I want to fill the ID column with Company0021 for this new record. Can anyone suggest a way to do this?
Thank you so much!
I would strongly suggest to use an identity column. Identity is a mechanism designed and used for this actual purpose and therefore it would be much better in terms of performance.
Nevertheless, if you insist on IDs on the format 'CompanyXXX' I would suggest to use a varchar column. Then you would add a trigger on the insert and update operations. When the trigger runs, it would find out the last 'CompanyXXX' and form the new one. If you need help regarding triggers, you could check this tutorial.
Hope I helped!
My suggestion would be to have an autoincrement field, and then concatenate the company name with the ID.
If you don't want to do it with an ID field, do you want it to happen automatically, or are you going to manage it manually? If automatically, you'll need to write a trigger to intercept the INSERT and change the value there. Shouldn't be too hard to do.
I'd seriously recommend NOT doing this and going down the autoincrement field path. It's better.
Add another column to the table to hold an integer value (in this example SNo) and then write query as
declare #SNo int
select #SNo=max(SNo)+1 from Table_Name
insert into Table_Namevalues (#SNo,'company'+right('0000'+cast(#SNo as varchar(10)),4))
And then see the result
Hope this helps
In case a solution is required as, having only one column with values in desired format you can create a function as:
create table table1(id varchar(100));
Go
create function dbo.fn_GetCompanyIdentity ()
returns varchar(100)
as
begin
declare #CompanyIdentify varchar(100);
select #CompanyIdentify =
(select 'Company' +
right ('00000' + cast (
(
(
case when Not exists (select ROW_NUMBER() over( order by (select 1)) from Table1 ) then 1
else (select top 1 ROW_NUMBER() over( order by (select 1)) as currentRownumber from Table1 order by currentRownumber desc) + 1
end
)
)
as varchar(4))
,4));
return #CompanyIdentify;
end;
go
and then use the function in insert statement as :
insert into Table1 (id)
select dbo.fn_GetCompanyIdentity();
Go
Hope this helps!!
Why dont you just create an auto-increment column and then concatenate "Company" to this column in another column. And for presentation just select "Company+autoincrement" column.
Related
I have a table which had an identity column.
for many reasons we had to remove the identity from that column.
I have a system that inserts a value to that table by the old way, passes null for the identity column.
is there a simple way to define identity column to receive a value in case it is passed to it, and if a value of null is passed, to make that table to set a unique value to that field that is not found in that table (act like identity).
What i mean is, if there is value, insert it.
And if the system tries to insert null act like an identity.
Thanks in advance.
A trigger seems like a good choice for this situation, but there are a lot of ways you can handle the situation.
The example below creates an INSTEAD OF insert trigger that gets the columns that were supposed to be inserted, and generates a new value via a function if the ID column is null.
CREATE TRIGGER myTrigger ON myTable
INSTEAD OF INSERT
AS
INSERT INTO myTable (myIDcolumn, anotherColumn)
SELECT COALESCE(myIDColumn, dbo.SomeMethodToCreateID), anotherColumn
FROM inserted
How that SomeTheodToCreateID function is to work is up to you. One thing you could do is change the SELECT to combine max plus row_number:
SELECT (COALESCE(myIDColumn,
(SELECT MAX(myIDColumn) FROM myTable) + ROW_NUMBER() OVER(ORDER BY anotherColumn)
)
...
Try This
DBCC CHECKIDENT ( '[dbo].[Customers]', RESEED, 1 )
I have a query like below and it generate a temporary table automatically based on parameter. So, the number of column of this table can be vary. Now , i need to add an auto incremental id column into this table.How i do it?
SELECT #SourceFields INTO ##StoreSourceInfo FROM testdb.dbo.#SourceTable
Note: 1) Number of source field & name of table pass using the parameter #SourceFields & #SourceTable.
2) So, the number of column can be vary on ##StoreSourceInfo table.
Current Result:
select * from ##StoreSourceInfo shows only the available column.
Expected Result:
select * from ##StoreSourceInfo query will show an additional auto incremental id column & all rest of the column available in the temp table.
Hope you get me. Thanks in advance.
SELECT
IDENTITY(INT, 1, 1) AS id
INTO #Temptable
FROM User
You can use row_number function
Select ROW_NUMBER() over (order by T.field1) rownum
, T.field1, T.field2 into #temp1
from #Table T
Use the identity function. See the link for an example. http://msdn.microsoft.com/en-us/library/ms189838.aspx
You have to try with following query to get your excepted result to add a extra auto increment column :
SELECT
IDENTITY(INT, 1,1) AS Rank,
#SourceFields
INTO
##StoreSourceInfo
FROM
testdb.dbo.#SourceTable
Means apply IDENTITY function...
The reason I need this for is that I made a column on my table called display_order, for now it's smallint and the numbers were pre-determined.
However, when I insert a new record with my software I don't know how to get the highest number in that column and add 1, so I thought about the possibility of an auto-incremented column where if I change 8 to 9 it will change everything else accordingly.
Is this possible?
The answer to your question is "No" IDENTITY is the only auto incrementing capability (and these columns are not updatable)
But if this is a display_order field can't you just make it float to allow you to insert items between other items rather than having to shift all other items down to create a gap?
However, when I insert a new record with my software I don't know how to get the highest number in that column and add 1,
Insert MyTable( display_order, .... )
Select (
Select Max(display_order) + 1
From MyTable As T1
), ...
From MyTable
However, I wouldn't recommend this. If display_order is user settable, then I would simply assume relative values. Thus, it wouldn't matter if a user added two values with a display_order = 0. If you really want to go the extra mile and provide the ability to resequence the display_order, you could do it like so:
Update MyTable
Set display_order = Z.NewSeq
From (
Select PKCol
, Row_Number() Over ( Order By display_order ) As NewSeq
From MyTable
) As Z
Join MyTable As T
On T.PKCol = Z.PKCol
Because you only get one IDENTITY column per table, I would probably use a trigger or other mechanism (if there's a centralized insertion stored proc) to default it to one more than the highest number in the table if not provided. This avoids having to SET IDENTITY_INSERT or anything like that.
I am using SQL Server 2008 and developing a project which is in maintenance phase.
I want to insert record in a table whose primary key is an Integer but not an identity. e.g. table name is tblFiles and fields are ID, FileName, FileContent.
Actually that table is in use so I don’t want to make any schema change in it. And I want the key after row insertion because I have to put that in another table. Existing values in the Id column are different integer, means not in sequence.
So I want the query that also returns me the Id value. So I want to insert only FileName and FileContent and some sort of sql to whom I can embed in my insert query which insert a unique Id and also send me that id
Well, if it's not an IDENTITY field - don't you already have to specify the "ID" in your insert for it to succeed ? If so - you already have the ID! Or what am I missing? Is the ID determined by a trigger or something??
If so, try this query:
INSERT INTO dbo.tblFiles(FileName, FileContent)
OUTPUT inserted.ID
VALUES ('yourfile.name', 'your contents')
This should return the newly inserted ID from the INSERT query.
Marc
Change the Columns Identity Specification > Is Identity to Yes.
The after inserting into the table you can
Select SCOPE_IDENTITY()
to get the integer that was just added and return this in your SP.
If you really can't edit the database schema maybe you could add another table to the database that has two columns called ID and CurrentDate. Make the ID column an Identity. In your code insert into this table first select SCOPE_IDENTITY() and then use the integer returned to insert as the ID in your tblFles table.
P.S. Stop prefixing your table with tbl that's so 1999. :)
You could create a unique integer, not so elegantly, using
SELECT MAX(ID) + 1 FROM tblFiles
And simply return this from your query or sproc as the case maybe. Otherwise follow as marc_s says if it is known already.
UPDATE: have to say, rather than this fudge as requested, I would strongly recommend pushing back hard and getting table changed so this is an identity column, as this is what is. all answers so far are simply fudges, mine especially.
so my final query look like...
Insert into dbo.tblData (Id, FName, LName)
output inserted.Id
values ((SELECT MAX(ID) + 1 FROM dbo.tblData), 'xyz', 'abc')
We can assign max(ID)+1 in to an integer variable, then we can Insert
Declare #ID int
Select #ID = ISNULL(MAX(ID),0) + 1 FROM tblFiles
INSERT INTO tblFiles
(
ID, FileName, FileContent
)
Select #ID,'FileName','FileContent'
This insertion is direct,
INSERT INTO tblFiles
(
ID, FileName, FileContent
)
Select (Select ISNULL(MAX(ID),0) + 1 FROM tblFiles),'FileName','FileContent'
Here we have to use ISNULL condition because there is no data in table then it will return Null. So ISNULL(MAX(ID),0) + 1 this condition will give Data is null then 0+1=1.
Thank you
I have a temp table with the exact structure of a concrete table T. It was created like this:
select top 0 * into #tmp from T
After processing and filling in content into #tmp, I want to copy the content back to T like this:
insert into T select * from #tmp
This is okay as long as T doesn't have identity column, but in my case it does. Is there any way I can ignore the auto-increment identity column from #tmp when I copy to T? My motivation is to avoid having to spell out every column name in the Insert Into list.
EDIT: toggling identity_insert wouldn't work because the pkeys in #tmp may collide with those in T if rows were inserted into T outside of my script, that's if #tmp has auto-incremented the pkey to sync with T's in the first place.
SET IDENTITY_INSERT ON
INSERT command
SET IDENTITY_INSERT OFF
As identity will be generated during insert anyway, could you simply remove this column from #tmp before inserting the data back to T?
alter table #tmp drop column id
UPD: Here's an example I've tested in SQL Server 2008:
create table T(ID int identity(1,1) not null, Value nvarchar(50))
insert into T (Value) values (N'Hello T!')
select top 0 * into #tmp from T
alter table #tmp drop column ID
insert into #tmp (Value) values (N'Hello #tmp')
insert into T select * from #tmp
drop table #tmp
select * from T
drop table T
See answers here and here:
select * into without_id from with_id
union all
select * from with_id where 1 = 0
Reason:
When an existing identity column is selected into a new table, the new column inherits the IDENTITY property, unless one of the following conditions is true:
The SELECT statement contains a join, GROUP BY clause, or aggregate function.
Multiple SELECT statements are joined by using UNION.
The identity column is listed more than one time in the select list.
The identity column is part of an expression.
The identity column is from a remote data source.
If any one of these conditions is true, the column is created NOT NULL instead of inheriting the IDENTITY property. If an identity column is required in the new table but such a column is not available, or you want a seed or increment value that is different than the source identity column, define the column in the select list using the IDENTITY function. See "Creating an identity column using the IDENTITY function" in the Examples section below.
All credit goes to Eric Humphrey and bernd_k
Not with SELECT * - if you selected every column but the identity, it will be fine. The only way I can see is that you could do this by dynamically building the INSERT statement.
Just list the colums you want to re-insert, you should never use select * anyway. If you don't want to type them ,just drag them from the object browser (If you expand the table and drag the word, columns, you will get all of them, just delete the id column)
INSERT INTO #Table
SELECT MAX(Id) + ROW_NUMBER() OVER(ORDER BY Id)
set identity_insert on
Use this.
Might an "update where T.ID = #tmp.ID" work?
it gives me a chance to preview the data before I do the insert
I have joins between temp tables as part of my calculation; temp tables allows me to focus on the exact set data that I am working with. I think that was it. Any suggestions/comments?
For part 1, as mentioned by Kolten in one of the comments, encapsulating your statements in a transaction and adding a parameter to toggle between display and commit will meet your needs. For Part 2, I would needs to see what "calculations" you are attempting. Limiting your data to a temp table may be over complicating the situation.