Nullable Fields When Using SELECT...INTO

Oct 14, 2006

Hi,

Could anyone tell me what governs whether a column is set as nullable or not nullable when creating a table using SELECT...INTO. It just seems to pick at random for me! I'm quite sure this is not the case. Is there a way to force a column to be non- nullable? I seem to be wasting a lot of time going through and altering the schema so I can use the columns in keys and indexes.



Dave

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Nullable Date Fields ?

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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Q On Joining Tables With Nullable Fields

Sep 27, 2006

Question.I have a new table that I am adding to a script that I wrote. Thistable has 3 fields, the first 2 fields are used in the on statement asbeing = other fields in the script.The first field always has data in it, but the 2nd field is sometimesnull.So my problem is if both fields have data in them and they both matchto the data in the fields that I am linking them to, then it returnsthe 3rd field without a problem. However if the 2nd field is null thenit is returning a null for the 3rd field. I have checked and the fieldthat I am linking to is null also.So if I haveselect t1.field1, t1.field2, t2.field1, t2.field2, t2.field3from table1 t1join table2 t2on t1.field1=t2.field1 and t1.field2=t2.field2with 2 records in each tabletable1: record1: data, datarecord2: data, nulltable2: record1: data,data,datarecord2: data,null,datawhat I get from the script isrecord1: data, data,data,data,datarecord2: data,null,data,null,nullI would expectrecord2: data,null,data,null,dataI hope this makes sense, I didn't want to post the entire actual scriptas it is about 150 lines long.Thanks in advance.

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Primary Key On Combination Of Nullable Fields, At Least One Not-null

Jul 23, 2005

I have a case where a table has two candidate primary keys,but either (but not both) may be NULL. I don't want to storea copy of the concatenated ISNULL'ed fields as an additionalcolumn, though that would work if necessary. Instead, I triedthe following (this is a related simplified example, not myreal one):CREATE FUNCTION ApplyActionPK(@IP int = NULL,@DNS varchar(64) = NULL)RETURNS varchar(74) -- NOT NULLASBEGINdeclare @val varchar(74)set @val = str(ISNULL(@IP, 0), 10)set @val = @val + ISNULL(@DNS, '')return @val-- Also tried "return str(ISNULL(@IP, 0), 10)+ISNULL(@DNS, '')"-- Also tried "return ISNULL(STR(@IP, 10), ISNULL(@DNS, ''))"-- ... and other things...ENDGOcreate table ApplyAction(-- An action applies to a computerAct varchar(16) NOT NULL,-- The action to applyIP int NULL,-- The computer IP address, orDNS varchar(64) NULL,-- The DNS name of the computerTarget as dbo.ApplyActionPK(ComputerID, DNS), -- PK value-- Also tried "Target as ISNULL(STR(@IP, 10), ISNULL(@DNS, ''))"CONSTRAINT PK_ApplyAction PRIMARY KEY(Act, Target))SQL Server always complains that the primary key constraint cannot becreated over a nullable field - even though in no case will the 'Target'field be NULL.Please don't explain that I should store an IP address as a string.Though that would suffice for this example, it doesn't solve myactual problem (where there are four nullable fields, two of whichare FKs into other tables).What's the reason for SQL Server deciding that the value is NULLable?What's the usual way of handling such alternate PKs?Clifford Heath.

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Mar 6, 2008

greetings

Sir i want to check and use the select statement to select which field have a nullable=false in a table

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Mar 6, 2008

greetings

i am use this query to select the primary field colums in a table
"select Column_Name as PrimaryKeycolumn
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WHERE TABLE_NAME = 'tbl_Activity'
and Constraint_Name like 'PK_%'"

but i want to select the fields which have a nullable=false
for that i want know the information schema for null

thank u

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Aug 4, 2006

I want to do a query where I dont want to put 100 fields in the query out of 105...I want to do a
 
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SOS help

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Jan 2, 2004

Hi,

I have a fairly basic query I want to make but I'm struggling on figuring out how to do it. Let's say I have some fields (e.g. Value1, Value2, Value3, etc). I simply want to do a Select statement that returns the highest value among those fields for every row in my db.

At first I thought of the built in Max function until I realized that is for within a column only.

Any help would be appreciated, thank you.

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Jun 5, 2008

Here is the problem that I am struggling with. The structure is:

States: StateID, StateName
Counties: CountyID, CountyName
Cities: CityID, CityName
Zips: Zip, StateID, CountyID, CityID
Regions: RegionID, RegionName
Region_Data: RegionID, StateID, CountyID, CityID

The thing about the region is that it can be defined by states only, in which case CountyID and CityId are NULL, can be defined by Counties too, in which case only CityID is NULL or it can be defined up to City level, in which case all 3 are set to something. Example, Northeast would be all cities from northeast, but Pocono would be just some counties in PA, and so on...

The issue is now selecting all cities that belong into a region... Normally I would join the Zips table with the Region_Data table and retrieve all CityIDs... The issue is that, as I said, the CountyID and CityID might be null for some records, so I am not sure how to retrieve them?

I came up with one idea in which I create 3 temporary tables and I select in them all the records that have 1) only state, 2) only state and county, 3) all 3, then I join each and I union the results...

But I am wondering if there is a way to do the select in one shot?

Any idea? I appreciate your help,

Thank you,

Iulian



Regards,

Iulian

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Jun 23, 2008

I have a really large table with many Proposal fields and corresponding approval fields.

Propose1
Approve1
Propose2
Approve2

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Sep 19, 2005

I have:
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but it doesn't like it. Is it legit syntax for mssqlserver?
This is a vb project aspnet

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Jul 14, 1999

An ADODB error spawn everytime I query more than 15 fields in a specific SQL Table. My sql statement is something like this:

set rs=server.createobject("ADODB.Recordset")
rs.open "select * from mytbl",application("mycon"),1,3

And the error is something like this:

"you can't query more than the maximum field "

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Oct 31, 2006

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Mar 27, 2014

In order to ask my question on a SQL query I will use a simplified version of a table I was struggling with...

¦¦¦¦SHOP¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦CARS

KILBURN MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes
KILBURN MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦BMW
KILBURN MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦FIAT
BRIXTON AUTOMOBILE¦¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes
BRIXTON AUTOMOBILE¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦BMW
WEST HAMPSTEAD CARS¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes
CAMDEM MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦FIAT
NORTHERN LONDON CAR-STORE¦¦¦¦¦¦¦¦¦¦¦BMW
NORTHERN LONDON CAR-STORE¦¦¦¦¦¦¦¦¦¦¦FIAT

So my question is: how can I select only SHOPs which have no CARS variety (e.g. a variety =1)?

In other words I am looking for a Query that would give me this outcome:

¦¦¦¦SHOP¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦CARS

WEST HAMPSTEAD CARS¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes
CAMDEM MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦FIAT

...because WEST HAMPSTEAD CARS, selling Mercedes only, has a CARS variety equal to 1 as well as Camdem Motors which sells only FIAT.

I tried with this query:

SELECT DISTINCT SHOP, CARS
FROM CAR_SELLERS
GROUP BY SHOP, CARS
HAVING COUNT(CARS) = 1

But it doesn't work.

In addition I also would like to know for example how to create a similar query for a different desired CARS variety (e.g. 2, 3...)

How to do the tabs or attach images in the Post New Topic Message box... I wanted to attach a screen shot of the table but I was not able to and so, in order to post my question, I prepared a simplified version of the table plus I had to do the tabs/spaces manually with the symbol (¦)

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Oct 23, 2005

Hi,Is there a way to exclude fields in a query other than just includingthe ones you want. If there are 20 fields and you want to see all but3, it would be a lot easier to exclude the 3.Thanks

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Jul 28, 2015

I have a code that gives me the sample I am looking for, but only displays one field.

NuminHH is my field

7320EN_Var is my Table

Proof is the new table I want to create.

SELECT DISTINCT [NuminHH] INTO Proof
from 7320EN_Var

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Jan 9, 2008

I thought this was working, but apparently it was not. I was wondering how I would create a SELECT Statement for values that are blank (Equal to ""). I really could have swore that this was working, but I guess it wasn't.

Here is my code:





Code Block

try
{
string conString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Environment.CurrentDirectory + @"MyDB.accdb;Jet OLEDB:Database Password=MyPassword;";

// create an open the connection
OleDbConnection conn = new OleDbConnection(conString);
OleDbCommand command = new OleDbCommand();
command = conn.CreateCommand();

// create the DataSet
DataSet ds = new DataSet();

// run the query
command.CommandText = "SELECT ID AS [#], Company AS [Company], FName AS [First Name], LName AS [Last Name], Type AS [Type] FROM Table1 WHERE Tags = @P0;";
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter = new OleDbDataAdapter(command);
command.Parameters.Add("@P0", OleDbType.VarChar).Value = "";
adapter.Fill(ds);

// close the connection
conn.Close();

bindingSource1.DataSource = ds.Tables[0];

DataGridView.DataSource = bindingSource1;

// set the size of the dataGridView Columns
this.DataGridView.Columns[0].Visible = false;
this.DataGridView.Columns[1].Width = 234;
this.DataGridView.Columns[2].Width = 50;
this.DataGridView.Columns[3].Width = 50;
this.DataGridView.Columns[4].Width = 75;

//Sort on the Title Column
DataGridViewColumn sortColumn = DataGridView.Columns[1];
ListSortDirection direction;
direction = ListSortDirection.Ascending;
DataGridView.Sort(sortColumn, direction);

//Set the Selected Property of the First Row to False
DataGridView.Rows[0].Selected = false;
}
catch
{
}

Thank you again for your help.

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Sep 2, 2015

I have a table with two sets of fields, one for PRIMARY Mail Address and the other for ALTERNATE Mail Address. Both sets are five fields long.  I will call them PRIMARY & ALTERNATE for this discussion.  I want to select the PRIMARY fields if ALTERNATE is either null or zero, and the ALTERNATE fields if data is present.

I have used this syntax but it gives a table with both the PRIMARY & SECONDARY records.

SELECT    TXPRCL, TXALTR, TXANAM
FROM    dbo.PCWEBF21
WHERE    (TXALTR > 0)
UNION
SELECT    TXPRCL, TXTAXP, TXTNAM
FROM    dbo.PCWEBF21
WHERE    TXALTR = 0

Would a Select Case work? something like

Select PRIMARY when ALTERNATE = 0, and ALTERNATE when ALTERNATE > 0 or is not null.

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Dec 30, 2006

Hi, how do i do a select statement with asp.net to return a record if a field is null.  I have the following code:
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The variable parentId is a nullable int.  However when i pass in a null value it doesn't return anything even though there are records in the database that have a null value for the ParentId field.
Appreciate if someone could tell me what i am doing wrong.  Thanks

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Jan 1, 2007

Is it possible to combine fields and text in a select statement?
In a dropDownList I want to show a combination of two different fields, and have the value of the selected item come from a third field. So, I thought I could maybe do something like this:
  SELECT DISTINCT GRP AS GroupName, "Year: " + YEAR + "Grade: " + GRD AS ShowMe
FROM GE_Data
WHERE (DIST = @DIST) 
 
I hoped that would take the values in YEAR and GRD and concatenate them with the other text. Then my dropDownList could show the ShowMe value and have the GroupName as the value it passes on. However, when I test this in the VS Query Builder, it says that Year and Grade are unknown column names and changes the double-quotes to square brackets.
If this is possible, or there's a better way to do it, I'd love some more info.
Thanks!
-Mathminded

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Dec 6, 2004

Hello,

I m writing a stored procedure to query a table Population that has the following fields - CityId, CityName, Plus0, Plus10, Plus20, Plus30, Plus40, Plus50, Plus60, Plus70, Plus80. The field Plus0 contains the number of people of age > 0 living in the city, Plus10 contains the number of people of age > 10 living in the city and so on. Given the city id and age groups like 20To40, 50To60, 40Plus, etc., I should be able to query the number of people in the city corresponding to the requested age group. Note that if the requested age group was 20To60, I need to make use of only 2 fields Plus20 and Plus60 in the table to compute this value. And if the requested age group was 40Plus, then I need only the value in the field Plus40. The problem is that a wide variety of age groups can be requested like 0Plus, 10Plus, ... , 80Plus, 0To10, 0To20, 0To30, .... 70To80.

Which is the most effecient way to handle this ?

1. Have a stored procedure that returns all the fields even though only 1 or 2 of them would be actually used ?

In this case, if I returned data for a large number of cities then there would be a lot of unnecessary information that was returned by the query. Lots of data would be passed through the network though most of it would not be used.

2. Have a stored procedure that takes in parameters @Plus0, @Plus10, @Plus20, .. @Plus80 that are bits indicating whether the field was required or not and then using a CASE statement to return values for a field only if the corresponding bit parameter was set, and returning NULL if the corresponding bit paramter was not set ?

In this case, I would be returning NULL for all those fields that were not required for a particular age group. This would save some network bandwidth, wouldn't it ?

3. Pass in the age group itself (ex: 0To20) as a parameter to the stored procedure and have lots of IF statements, one for each age group, that return only the fields that are needed for that age group.

This leads to a lot of code repitition.

4. Use a similar approach as above but use dynamic SQL queries to avoid code repitition.

But using dynamic SQL queries can affect the performance of the stored procedure as they need to be compiled each time.

5. Any other possible approaches ??

Looking forward to your responses,

Thanks much,

bmgun.

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Sep 28, 1999

Hi:

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Mar 11, 2008

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b.propertyvalue

from product a, productpropertyvalue b

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Ron

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Jul 19, 2006

Hello,

I've been busy all night searching and reading trying to figure out how I can do the following.

I have a table that tracks user IDs in multiple fields. When I select records from this table I need a way to resolve those ID fields back into user names by referencing the users table. SQL statement thus far...

SELECT A.Username as NameA, B.Username As NameB, FROM theTable, Users As A, Users As B WHERE theTable.UserIDA ???

How do I resolve theTable.UserIDA and theTable.UserIDB back to Users.Username so that the records returned fill the fields NameA and NameB?

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Thanks,

-Mike
Ontario, Canada

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Oct 17, 2004

Dear All
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But the problem is if any of the three field is null the combined field 'Address' returns as Null.
Please help me to overcome this problem.

Regards
kalanad ( beginner)

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Dec 3, 2007

hey all,

say i have the following function

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FROM GLF_CHART_ACCT

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GROUP BY GLF_CHART_ACCT.DESCR1, F1ADR_ADDRESS.ADDR1, F1ADR_ADDRESS.ADDR2,
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what i dont get is why i have to create seperate groups for this query...or am i reading it wrong??

Cheers,

Justin

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or
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Jul 23, 2005

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Sep 29, 2005

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CREATE Procedure dbo.spButterMarTotals
(
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)
AS
--
--Exec spButterMarTotals '11/15/06','11/15/06'
--
--


Select Distinct ButterballsThrownPounds, ReworkUsedPounds, ReworkMadePounds, CoolersUsedPounds, CoolersMadePounds, TrucksMadePounds,
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from tblproductionMaterialmetrics A

Inner Join tblNFCTracking B on
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Inner Join tblProcessingDtl C on
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Hi,

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Thanks,
Anita.

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Dec 12, 2000

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