Copy Table Leaving Nullable Columns
Nov 14, 2000
I would like to dynamically copy a table in Transact SQL, like this:
SELECT * into NEW_TABLE from MY_TABLE where 1 = 2
This creates an empty NEW_TABLE as desired. However, NEW_TABLE retains the column nullability of MY_TABLE; I would like NEW_TABLE to have all its columns nullable.
I tried to write Transact SQL logic to update the isnullable column in syscolumns for NEW_TABLE, but was told that the entire SQL Server would have to be reconfigured to allow this.
Does anyone know of another way to do this?
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Oct 29, 2007
I need to programatically create a mdb file which will contain nullable columns. I am using C++ with ADOX for the table creation and ADO to perform the table update.
Although ADOX seems to create the table ok, Table->Columns->Appends does not set the fields as adColNullable as expected.
When I insert data using ADO::Recordset->AddNew the following error occurs :- "The field 'MyTable.Column 2' cannot contain a Null value because the Required property for this field is set to True. Enter a value in this field."
Am I on the right tracks here or do I need to adopt a different approach?
Code block to illustrate the problem :-
Code Block
ADOX::_CatalogPtr m_pCatalog;
ADOX::_TablePtr m_pTable;
ADOX::_ColumnPtr m_pCol1;
ADOX::_ColumnPtr m_pCol2;
ADODB::_ConnectionPtr m_pConn;
ADODB::_RecordsetPtr m_pRs;
//ADOX - Create Data Source
_bstr_t strcnn(("Provider='Microsoft.JET.OLEDB.4.0';Data source = C:\test.mdb"));
m_pCatalog.CreateInstance(__uuidof (ADOX::Catalog));
m_pCatalog->Create(strcnn);
m_pTable.CreateInstance(__uuidof(ADOX::Table));
m_pTable->PutName("MyTable");
m_pCol1.CreateInstance(__uuidof(ADOX::Column));
m_pCol1->Name = "Column 1";
m_pCol1->Type = ADOX::adVarWChar;
m_pCol1->DefinedSize = 24;
m_pCol1->Attributes = ADOX::adColNullable;
m_pTable->Columns->Append(m_pCol1->Name, ADOX::adVarWChar, 24);
m_pCol2.CreateInstance(__uuidof(ADOX::Column));
m_pCol2->Name = "Column 2";
m_pCol2->Type = ADOX::adVarWChar;
m_pCol2->DefinedSize = 24;
m_pCol2->Attributes = ADOX::adColNullable;
m_pTable->Columns->Append(m_pCol2->Name, ADOX::adVarWChar, 24);
m_pCatalog->Tables->Append(_variant_t((IDispatch *)m_pTable));
//ADO - Data Access
m_pConn.CreateInstance (__uuidof(ADODB::Connection));
m_pConn->Open(strcnn,_bstr_t(""),_bstr_t(""),ADODB::adOpenUnspecified);
m_pRs.CreateInstance(__uuidof(ADODB::Recordset));
m_pRs->Open("MyTable", _variant_t((IDispatch *)m_pConn,true),ADODB::adOpenKeyset, ADODB::adLockOptimistic, ADODB::adCmdTable);
// Define a SafeArray that contains field names.
SAFEARRAY * psaFields;
SAFEARRAYBOUND aDimFields[1];
aDimFields[0].lLbound = 0;
aDimFields[0].cElements = 1;
psaFields = SafeArrayCreate(VT_VARIANT, 1, aDimFields);
// Create a SafeArray for values.
SAFEARRAY * psaValues;
SAFEARRAYBOUND aDimValues[1];
aDimValues[0].lLbound = 0;
aDimValues[0].cElements = 1;
psaValues = SafeArrayCreate(VT_VARIANT, 1, aDimValues);
long ix[1];
_variant_t var;
//Insert Data
ix[0] = 0;
var = "Column 1";
SafeArrayPutElement(psaFields, ix, (void*) (VARIANT *) (&var));
ix[0] = 0;
var = "test data row 1 col 1 Only";
SafeArrayPutElement(psaValues, ix, (void*)(VARIANT *) &var);
_variant_t vtFields, vtValues;
vtFields.vt = VT_ARRAY | VT_VARIANT;
vtValues.vt = VT_ARRAY | VT_VARIANT;
vtFields.parray = psaFields;
vtValues.parray = psaValues;
m_pRs->AddNew(vtFields, vtValues); //!! Fails Here !!
m_pRs->Update();
m_pRs->Close();
m_pConn->Close();
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Jul 29, 2002
Hi,
I want to define Primary Key non-clustered on Nullable columns with datatype
as varchar ( 50 ) .
When i try to assign primary key , it gives me an error that
' Cannot define Primary Key contraint on nullable columns in table 'Table 1 '.
Could not create contraint . See previous errors . '
Any ideas how to resolve this issue ?
Thanks,
Anita.
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Jul 20, 2005
Hi,I've enherited a big mess, a SQL Server 2000 database withapproximately 50 user tables and 65+ GB data, no explicitrelationships among entities (RI constraints whatsover), attempt tocreate an ERD would more than likely kill the relatively complexedapp, the owner would want to drop out of window, so,I don't intend to do that, you get the picture, sorry no DDLs thistime, and many tables have many nullable columns, joins slows down thesystem quite a bit, what's my best bet to improve its performance?change most of these nullable columns into non-nullable with defaultvalue of something like ' ', any thoughts along this line would beappreciated.
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Nov 21, 2013
I have 4 particular columns (crt_dt,upd_dt,entity_active and user_idn) in many of the tables in my database. Now i have to find all the tables having four columns mentioned above and cases are
1) if the column is nullable., then it should result 'Y'
2) if the column is not nullable., then it should result 'N'
3)if column is not present., then it should display '-'
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Jan 5, 2002
At first I have to apologize that I write here. This is not right place for my problem but I could not find any better place to ask help.
I'm creating a new table and I have to copy some columns from the old one to the new. Desciption of the old table is something like that:
Table1: name char(32) not null primary key, variable1 char(32), variable2 char(32).
Now I would like to copy columns variable1 and variable2 to the new table (called Table2). I need to change the names to the id-numbers. (Don't ask me why, I just have to :) I have created Table2. Table2: id int not null primary key, newvariable1 char(32), newvariable2 char(32).
Now the problem is that how can I copy just columns variable1 and 2 without the name-column (witch is the primary key)? I just an error message:
DB21034E The command was processed as an SQL statement because it was not a valid Command Line Processor command. During SQL processing it returned:
SQL0407N Assignment of a NULL value to a NOT NULL column "TBSPACEID=2,
TABLEID=578, COLNO=0" is not allowed. SQLSTATE=23502
It just says that (if I understood the message) I can't leave the id-column blank. How can I generate the keys to Table2? It would be nice to get keys from 1,2,3...
Please help me. :)
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May 15, 2014
I have a very large table that I need to partition. Ideally the table will write to three filegroups. I have defined the Partition function and scheme as follows.
CREATE PARTITION FUNCTION vm_Visits_PM(datetime)
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CREATE PARTITION SCHEME vm_Visits_PS
AS PARTITION vm_Visits_PM TO (vm_Visits_Data_Archive2, vm_Visits_Data_Archive, vm_Visits_Data)
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ALTER TABLE dbo.vm_Visits
ADD CONSTRAINT [PK_vm_Visits] PRIMARY KEY CLUSTERED
(
VisitID ASC,
Closed
)
ON [vm_Visits_PS](Closed)
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Nov 8, 2000
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If I uninstall 7.0 will that blow away 6.5?
Thanks
JJ
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Feb 20, 2008
Hi,
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What will happen if I remove him?
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Occasionally the script task fails with this error message:
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Here is the code of my script:
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Thank you very much in advance.
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Oct 4, 2007
Hi folks. Thanks for the opportunity to get a bit of help here.
I've got two tables. Say, table "foo" and table "bar".
I LEFT JOIN them on a key, say, foo.id and bar.fooid.
For some reason, when I do this join, I get only records from "foo" which have a mate in "bar".
What I really need is all records from "foo", but the columns from bar when there is a match. I don't want to exclude records from "foo" just because they don't have a match from "bar".
Am I just misusing LEFT JOIN?
Any guidance would be greatly appreciated.
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Jul 22, 2015
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**TABLE_ONE**
Type Animal TestID
-----------------------------------------
Mammal Goat 1
Fish Cod 1
Bird Chicken 1
Reptile Snake 1
Bird Crow 2
Mammal Cow 2
Bird Ostrich 3
**Table_Two**
Test_name TestID
-------------------------
Test_1 1
Test_1 1
Test_1 1
Test_1 1
Test_2 2
Test_2 2
Test_3 3
In Table_One all types come under one column and the values of all Types (Mammal, Fish, Bird, Reptile) come under another column (Animals). Table_One and Two can be linked by Test_ID
I am trying to create a table such as shown below:
Test_Name Bird Reptile Mammal Fish
-----------------------------------------------------------------
Test_1 Chicken Snake Goat Cod
Test_2 Crow Cow
Test_3 Ostrich
This should be my final table. The approach I am currently using is to make multiple instances of Table_One and using joins to form this final table. So the column Bird, Reptile, Mammal and Fish all come from a different copy of Table_one.
For e.g
Select
Test_Name AS 'Test_Name',
Table_Bird.Animal AS 'Birds',
Table_Mammal.Animal AS 'Mammal',
Table_Reptile.Animal AS 'Reptile,
Table_Fish.Animal AS 'Fish'
From Table_One
[Code] .....
The problem with this query is it only works when all entries for Birds, Mammals, Reptiles and Fish have some value. If one field is empty as for Test_Two or Test_Three, it doesn't return that record. I used Or instead of And in the WHERE clause but that didn't work as well.
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I am using a DTS to copy columns from one database to another.
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thanks in Advance
ActionAnt
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i have data in a table..
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a 1 x
b 2 y
c 3 z
i want the resultant table should look like this
a b c
1 2 3
x y z
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Apr 10, 2007
Hi all,
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I managed to do this, using a Ole DB source and a Ole DB destination dataset.
Now I want to merge 2 colums into 1:
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Destination Database: Column 1: First and lastname customer.
Thanks for your help!
Kind regards,
Marcel Hijnen
eXDe Solutions B.V.
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Aug 15, 2007
I have 1 table in my db that I have imported from a txt file using DTS.
In my database "DOJ" I have a table named "DOJGRAB" with ALL my data fresh from a import using DTS.
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Hi,I have a problem, I have a table with a text type column and anvarchar(2000) type column on my MS SQL 2000 Server.I know that the longest text in the text field is 1000 chars. I want tocopy the content the content of the text field into the nvarchar field.I tried convert and cast but after the update there are only 255 charsin the nvarchar field.Best regardsMarc
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Mar 16, 2007
Is there a way to copy and paste data into columns when view the table columns?
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TIA
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Nov 4, 2015
I am trying to Import data into SQL server 2008 using management studio. The source data is an Access dbase. I am trying to do this with queries as the tables do not match but I do need to copy specific columns for the source to the destination. Any brief example selecting a column from the source table, and just entering a dummy value for other columns(other column of data for destination table does not exist in source table).Â
For the example
Source access dbase, just two columns but no primary key, T2dbase, Employee
New table.
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Jan 9, 2008
Hi all,
The following dbo.Tables of Northwind.mdf in my .SQLEXPRESS (SQL Server Management Studio Express) are missing:
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dbo.CustomerCustomerDemo
dbo.CustomerDemographics
dbo.Customers
dbo.Employees
dbo.EmployeeTerritories
dbo.Order Details
dbo.Orders
dbo.Products
dbo.Regions
dbo.Shippers
dbo.Suppliers
dbo.Territories.
But, I have these dbo.Tables in a different Database "xyzDatabase". How can I copy each of these dbo.Tables to the another blank dbo.Table of Northwind Database?
I right clicked on the dbo.Categories and I saw the following thing:
dbo.Categories
New Table...
Modify
Open Table
Script Table as |> CREATYE To |>
DROP To |>
SELECT To |>
INSERT To |> New Query Editor Window
File....
Clipboard
UPDATE To |>
DELETE to |>
From the above observation,I think it is possible to copy the dbo.Table from the one Database to the Northwind Database that needs to be repaired. Please help and advise me how to do this task or tell me where I can find the Microsoft document that gives the details of this X-copy thing.
Thanks in advance,
Scott Chang
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Jan 26, 2006
Just wondering if there is an easy transact statement to copy table 1 to table 2, appending the data in table 2.with SQL2000, thanks.
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Sep 19, 2007
Hi,
I have two tables
Table Source
{
category varchar(20),
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Table Destination
{
SubjectId varchar(20),
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}
Please note that the number columns are different in each table.
I wanted to dump the data of Source table to Destination table. I meant to say that the rows of 2 columns in Source table to last 2 rows of Destination table.
And also my oreder of the columns in Destination table will vary. So i need to a way to dynamically insert the data in bulk. but i will know the column names for sure before inserting.
Is there anyway to bulk insert into these columns.
Your quick response will be appreciated
~Mohan Babu
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Apr 29, 2015
I have a business need to create a report by query data from a MS SQL 2008 database and display the result to the users on a web page. The report initially has 6 columns of data and 2 out of 6 have JSON data so the users request to have those 2 JSON columns parse into 15 additional columns (first JSON column has 8 key/value pairs and the second JSON column has 7 key/value pairs). Here what I have done so far:
I found a table value function (fnSplitJson2) from this link [URL]. Using this function I can parse a column of JSON data into a table. So when I use the function above against the first column (with JSON data) in my query (with CROSS APPLY) I got the right data back the but I got 8 additional rows of each of the row in my table. The reason for this side effect is because the function returned a table of 8 row (8 key/value pairs) for each json string data that it parsed.
1. First question: How do I modify my current query (see below) so that for each row in my table i got back one row with 19 columns.
SELECT A.ITEM1,A.ITEM2,A.ITEM3,A.ITEM4, B.*
FROM PRODUCT A
CROSS APPLY fnSplitJson2(A.ITEM5,NULL) B
If updated my query (see below)Â and call the function twice within the CROSS APPLY clause I got this error: "The multi-part identifier "A.ITEM6" could be be bound.
2. My second question: How to i get around this error?
SELECT A.ITEM1,A.ITEM2,A.ITEM3,A.ITEM4, B.*, C.*
FROM PRODUCT A
CROSS APPLY fnSplitJson2(A.ITEM5,NULL) B, Â fnSplitJson2(A.ITEM6,NULL) C
I am using Microsoft SQL Server 2008 R2 version. Windows 7 desktop.
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May 26, 2015
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Jul 20, 2005
Hello,Using SQL Server 2000, I'm trying to put together a query that willtell me the following information about a view:The View NameThe names of the View's columnsThe names of the source tables used in the viewThe names of the columns that are used from the source tablesBorrowing code from the VIEW_COLUMN_USAGE view, I've got the codebelow, which gives me the View Name, Source Table Name, and SourceColumn Name. And I can easily enough get the View columns from thesyscolumns table. The problem is that I haven't figured out how tolink a source column name to a view column name. Any help would beappreciated.Garyselectv_obj.name as ViewName,t_obj.name as SourceTable,t_col.name as SourceColumnfromsysobjects t_obj,sysobjects v_obj,sysdepends dep,syscolumns t_colwherev_obj.xtype = 'V'and dep.id = v_obj.idand dep.depid = t_obj.idand t_obj.id = t_col.idand dep.depnumber = t_col.colidorder byv_obj.name,t_obj.name,t_col.name
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May 30, 2006
I have just started on a project which will be based on an existing MS SQL Server database. It has many columns which can be, and sometimes are, null. My basic DataReader code throws an SqlNullValueException when I try to GetInt32 but not when I try GetString. Why the difference?
Also, how do I model my class? Do I have to make all fields into nullable types? If I do that I notice a simple GridView will not show a column for that field! I am confused.
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Dec 12, 2000
Is there a way to set a column nullable in a script if all I have is the column name, something like:
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The problem is that ALTER TABLE requires the type, so you have to say something like:
exec('ALTER TABLE xyz ALTER COLUMN ' + @col_name + ' decimal(12,4) NULL')
But the data type is not given to the script, so it is stuck.
I realize that syscolumns provides some relevant information, but it is not clear how to convert its information to a string like "decimal(12,4)". It seems, for example, that a decimal type has syscolumns.xtype = 106; however I can find no documentation on this, nor am I assured I can get all the right codes by trial and error. Does anyone know of a clear means of getting this information?
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Sep 10, 2007
What happens if a column which has been defined so that it should not be Nullable is passed a value which is null?
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Thanks
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Aug 1, 2006
I am trying to add a DateTime? parameter to SqlCommand. It works when the variable has a value, but when its null, an exception gets thrown saying that parameter was not supplied.What is causing this error?
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Feb 5, 2008
Hi all,
I am using a SQL statement with a JOINs to display a summary list of Work Orders with some information from the related Purchase Order. I don't require that a Work Order be attached to a Purchase Order, so the JOIN field, POLineItemID, may not be present. My current problem is that my summary page does not show Work Orders that have a NULL value for POLineItemID -- ie, the JOINing field becomes required.
How can I continue to use this JOIN structure but still return rows that don't have this JOIN field?
Thanks in advance for your help. Here is my SQL statement for this...
SELECT tblWorkOrder.WorkOrderNumber, tblWorkOrder.ActualCompletionDate, tblWorkOrder.EstimatedCompletionDate, tblWorkOrder.AssignedTo, tblWorkOrder.DelegatedTo, tblWorkOrder.Due, tblPurchaseOrders.PONumber, tblWorkOrder.POLineItemID, tblPOLineItems.POLineItemID AS Expr1, tblPOLineItems.PurchaseOrderID, tblPurchaseOrders.PurchaseOrderID AS Expr2, tblProducts.ProductID, tblProducts.ProductCategory, tblWorkOrder.ProductID AS Expr3, tblWorkOrder.WorkOrderStatusFROM (((tblWorkOrder INNER JOIN tblPOLineItems ON tblWorkOrder.POLineItemID = tblPOLineItems.POLineItemID) INNER JOIN tblPurchaseOrders ON tblPOLineItems.PurchaseOrderID = tblPurchaseOrders.PurchaseOrderID) INNER JOIN tblProducts ON tblWorkOrder.ProductID = tblProducts.ProductID)ORDER BY tblWorkOrder.Due
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Dec 7, 2007
Is it bad design to allow nulls on a date field ? I can think of one case such as a sale of an item and populating a field for the date of purchase, only when the purchase took place (and null until then).
comments ?
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Jul 20, 2005
Hi All!General statement: FK should not be nullabe to avoid orphans in DB.Real life:Business rule says that not every record will have a parent. It isimplemented as a child record has FK that is null.It works, and it is simpler.The design that satisfy business rule and FK not null can beimplemented but it will be more complicated.Example: There are clients. A client might belong to only one group.Case A.Group(GroupID PK, Name,Code…)Client(ClientID PK, Name, GroupID FK NULL)Case B(more cleaner)Group(GroupID PK, Name, GroupCode…)Client (ClientID PK, Name, ….)Subtype:GroupedClient (PersonID PK/FK, GroupID FK NOT NULL)There is one more entity in Case B and it will require an additionaljoin in compare with caseAExample: Select all clients that belongs to any groupSummary Q: Is it worth to go with CaseB?Thank you in advance
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