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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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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Jul 23, 2005

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Hello.

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Anyone any better ideas?

Thanks in advance

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hi,

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Example:

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Here we convert the date field to the format "dd/mm/yyyy" so when sorting is done it is done in the format "dd/mm/yyyy". But instead sorting should be done in "yyyy/mm/dd" format.

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May 7, 2004

Hi,

I have the following table:

CREATE TABLE [Orders] (
[OrdID] [int] ,
[OrderDate] [datetime] ,
[OrderDateONLY] [datetime],
[OrderDayName] [nvarchar] (15),
[OrderMonth] [nvarchar] (25),
[OrderDayOfMonth] [smallint] NULL ,
[OrderWeekofYear] [smallint] NULL
)
GO

The field OrderDate contains BOTH Date and Time information. What I want to do is populate the fields (in bold above) from the OrderDate field... I have tried all that I could think of but nothing works. The last and the best try that I gave was the {B}following[/B] but that too does not work. Can you PLEASE help. Many thanks in advance:


Insert ORDERS
(OrderDateONLY, OrderDayName, OrderMonth, OrderDayOfMonth, OrderWeekofYear)
select
d, datename (dw, d), datename (mm, d), Year (d), datepart (ww, d)
from
(select convert (char (8), OrderDate, 112)as d
from ORDERS
) as x

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Jan 4, 2006

Hello, I am wondering how to select the max date from a database view containing multiple date fields for a particular record. I am rusty at SQL and can't seem to get started. Here's an example of the data:

PRCL_IDPROJ_STRT_DTORD_DT ...
1242/3/20063/5/2006
5206/3/20068/2/2006
6412/31/2005
1872/14/20063/16/2006

I need to be able to compare the max date for each PRCL_ID record ("where prcl_id="). In the example above, prcl_id 124 has a max date of 3/5/2006, and prcl_id 520 has a max date of 8/2/2006, etc. The results of the SQL query should return the PRCL_ID and the max date.

Example query results:

PRCL_ID ORD_DT
124 3/5/2006

Please let me know if you can help or if I can provide more info.

Thanks,
Alexkav

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Feb 28, 2006

I am trying to compare two date fields; one is a string and one is a getdate() field. I am trying to get them into the same format so I can compare them. What am I doing wrong??? :eek:

select convert(integer, substring(loc_86, 1, 2)) as tmonth,
convert(integer, substring(loc_86, 3, 2)) as tday,
convert(integer, '20'+right(loc_86, 2)) as tyear,
datepart(month, (dateadd(day, -1, (getdate())))) as ymonth,
datepart(day, (dateadd(day, -1, (getdate())))) as yesterday,
datepart(year, (dateadd(day, -1, (getdate())))) as yyear
from ub_chg_tbl join ubmast_tbl
on (ubmast_tbl.patient_nbr = ub_chg_tbl.patient_nbr)
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Please Help Me Populate My Date Fields

May 7, 2004

Hi,

I have the following table:

CREATE TABLE [Orders] (
[OrdID] [int] ,
[OrderDate] [datetime] ,
[OrderDateONLY] [datetime],
[OrderDayName] [nvarchar] (15),
[OrderMonth] [nvarchar] (25),
[OrderDayOfMonth] [smallint] NULL ,
[OrderWeekofYear] [smallint] NULL
)
GO

The field OrderDate contains BOTH Date and Time information. What I want to do is populate the fields (in bold above) from the OrderDate field... I have tried all that I could think of but nothing works. The last and the best try that I gave was the following but that too does not work. Can you PLEASE help. Many thanks in advance:


Insert ORDERS
(OrderDateONLY, OrderDayName, OrderMonth, OrderDayOfMonth, OrderWeekofYear)
select
d, datename (dw, d), datename (mm, d), Year (d), datepart (ww, d)
from
(select convert (char (8), OrderDate, 112)as d
from ORDERS
) as x

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Jul 20, 2005

Does anyone know if Microsoft is planning to add a DATE only data typeto SQLServer.I know that you could use a datetime and convert/cast or use datepartto compare, but this can be tedious and error prone.What is the recommended way to compare date-only fields?eg if convert(char(11), @date_field) = convert(getdate(), @date_field)-- do something??

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Nov 18, 2007

Below is the schema and data for a simple table dat looks similar in structure to what I have.




Code Block
/****** Object: Table [dbo].[cumulative] Script Date: 11/17/2007 17:29:58 ******/
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[cumulative]') AND type in (N'U'))
DROP TABLE [dbo].[cumulative]
GO
/****** Object: Table [dbo].[cumulative] Script Date: 11/17/2007 17:29:58 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[cumulative]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[cumulative](
[PK] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[ID] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[date] [datetime] NULL,
[wear] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[distance] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
)
END
GO
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'1', N'21', CAST(0x000098B200000000 AS DateTime), N'1', N'10')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'2', N'22', CAST(0x000098B200000000 AS DateTime), N'2', N'11')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'3', N'23', CAST(0x000098B200000000 AS DateTime), N'3', N'23')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'4', N'21', CAST(0x000098B300000000 AS DateTime), N'4', N'22')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'5', N'22', CAST(0x000098B300000000 AS DateTime), N'3', N'32')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'6', N'23', CAST(0x000098B300000000 AS DateTime), N'1', N'12')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'7', N'21', CAST(0x000098B400000000 AS DateTime), N'4', N'15')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'8', N'22', CAST(0x000098B400000000 AS DateTime), N'2', N'17')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'9', N'23', CAST(0x000098B400000000 AS DateTime), N'2', N'10')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'10', N'21', CAST(0x000098B500000000 AS DateTime), N'2', N'8')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'11', N'22', CAST(0x000098B500000000 AS DateTime), N'6', N'9')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'12', N'23', CAST(0x000098B500000000 AS DateTime), N'3', N'11')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'13', N'21', CAST(0x000098B600000000 AS DateTime), N'4', N'24')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'14', N'22', CAST(0x000098B600000000 AS DateTime), N'3', N'5')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'15', N'23', CAST(0x000098B600000000 AS DateTime), N'2', N'34')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'16', N'21', CAST(0x000098B700000000 AS DateTime), N'3', N'12')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'17', N'22', CAST(0x000098B700000000 AS DateTime), N'1', N'12')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'18', N'23', CAST(0x000098B700000000 AS DateTime), N'3', N'13')
INSERT [dbo].[cumulative] ([PK], [ID], [date], [wear], [distance]) VALUES (N'19', N'23', CAST(0x000098B800000000 AS DateTime), N'5', N'14')





I need a sql code that will calculate and create a cumulative wear and distance fields. Im working in SQL server 2005 (sp2).

What I will like to see for the new fields is like:






Cum_Dist
Cum_wear

10
1

11
2

23
3

32
5

43
5

35
4

47
9

60
7

45
6

55
11

69
13

56
9

79
15

74
16

90
11

91
18

86
17

103
14

117
19

Happy thanksgiving!!

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This would work:
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May 3, 2007

I Apologize if this isn't the forum to ask this...
I have a MS Access (MDB) file with a table with 2 date fields, i want to read from a dialog on my app (on MS Visual .NET Studio 2005), here's the code I've been using do far:



Code Snippet

hr=theApp.m_cs.Open(theApp.m_ds);
if(SUCCEEDED(hr)) {


theApp.m_cs.StartTransaction();


theApp.m_cs.Commit();
CCommand< CDynamicAccessor > cmd;
CComBSTR query(_T("SELECT NumContrato, NumClie, FechaC, FechaCob, Inversion, NoCobrador, NoVendedor, Total, Plazo, Pagos FROM Contrato"));
CString string(query.m_str);
cmd.Open(theApp.m_cs,string);

hr = cmd.MoveFirst();

query=static_cast< BSTR >(cmd.GetValue(1));
CString csres(query.m_str);
this->m_numc=(int)*(query.m_str);
query=static_cast< BSTR >(cmd.GetValue(2));
m_numcte=(int)*(query.m_str);
query=static_cast< BSTR >(cmd.GetValue(3));
//m_fecc=(int)*(query.m_str);

MessageBox(csres);
theApp.m_cs.Close();
}

FechaC, FechaCob, are the two Dates I want to retrieve, but when I debug, it reads a 0 (zero) from the date fields, is there a limitation? can they be read? is there a special way to read them?
> thanks in advance!


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Me!

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