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Time Conversion Formula


Does any of you have an SQL example that will convert a given date to the number of seconds since 1970? We have one that does the opposite (seconds to date), but can't figure out how to go date to seconds.


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A common problem in moving data between SQL Server and UNIX systems is converting to/from the SQL Server datetime format to the UNIX time format.

There are several UNIX time formats, but the most common is a signed 32-bit integer that represents time as the number of seconds between 1970-01-01 00:00:00 and a given time. The functions in the script can be use to convert between SQL Server datetime and this UNIX time format.

For more information on UNIX Time, please read this link:
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For more information about SQL Server date/time conversions, refer to this link:
Date/Time Info and Script Links
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=64762



The conversion of UNIX Time to SQL Server datetime is fairly trivial using the SQL Server DATEADD function, and this is the logic used by the F_UNIX_TIME_TO_DATETIME function in the script:

declare @UNIX_TIME int
select @UNIX_TIME = 1111111111
-- Using dateadd to add seconds to 1970-01-01
select [Datetime from UNIX Time] = dateadd(ss,@UNIX_TIME,'1970-01-01')

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------------------------------------------------------
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The conversion of SQL Server datetime to UNIX Time is more complex. SQL Server datetime is accurate to milliseconds so is necessary to either truncate or round off the time to a whole second. The function in the F_DATETIME_TO_UNIX_TIME script rounds the time down if milliseconds is less than 500 and up otherwise. A second problem is that UNIX Time is an integer, so it can only represent time from 1901-12-13 20:45:52 through 2038-01-19 03:14:07. The range of SQL Server datetime is 1753-01-01 through 9999-12-31, so the function in the script has logic to return a NULL if the datetime is outside the valid UNIX Time range. Another minor issue is that the SQL Server DATEDIFF function will not cover the full range of an integer value with seconds, so it is necessary to have additional logic in the function do cover the time from 1901-12-13 20:45:52 to 1901-12-14 00:00:00.

The function names created by this script are:
dbo.F_DATETIME_TO_UNIX_TIME( @DAY )
dbo.F_UNIX_TIME_TO_DATETIME( @UNIX_TIME )

The script also includes code to test and demo the functions.




if objectproperty(object_id('dbo.F_DATETIME_TO_UNIX_TIME'),'IsScalarFunction') = 1
begin drop function dbo.F_DATETIME_TO_UNIX_TIME end
go
create function dbo.F_DATETIME_TO_UNIX_TIME
( @DAY datetime )
returns int
as
/*
Function: F_DATETIME_TO_UNIX_TIME

Finds UNIX time as the difference in seconds between
1970-01-01 00:00:00 and input parameter @DAY after
rounding @DAY to the neareast whoie second.

Valid datetime range is 1901-12-13 20:45:51.500 through
2038-01-19 03:14:07.497. This range is limited to the smallest
through the largest possible integer.

Datetimes outside this range will return null.
*/
begin
declare @wkdt datetime

-- Return null if outside of valid UNIX Time range
if @DAY < '1901-12-13 20:45:51.500' or @DAY > '2038-01-19 03:14:07.497'
return null

-- Round off datetime to nearest whole second
select @wkdt = dateadd(ms,round(datepart(ms,@DAY),-3)-datepart(ms,@DAY),@DAY)

-- If date GE 1901-12-14
if @wkdt >= 712return datediff(ss,25567,@wkdt)

-- Handles time GE '1901-12-13 20:45:52.000 and LT 1901-12-14
return -2147472000-datediff(ss,@wkdt,712)

end
go
if objectproperty(object_id('dbo.F_UNIX_TIME_TO_DATETIME'),'IsScalarFunction') = 1
begin drop function dbo.F_UNIX_TIME_TO_DATETIME end
go
create function dbo.F_UNIX_TIME_TO_DATETIME
( @UNIX_TIME int )
returns datetime
as
/*
Function: F_UNIX_TIME_TO_DATETIME

Converts UNIX time represented as the difference
in seconds between 1970-01-01 00:00:00 to a datetime.

Any valid integer -2,147,483,648 through 2,147,483,647
can be converted to datetime.
*/
begin

return dateadd(ss,@UNIX_TIME,25567)

end
go

go
/*
Demo functions F_DATETIME_TO_UNIX_TIME and
F_UNIX_TIME_TO_DATETIME by converting a datetime
to UNIX time and back to datetime.
*/

select
[Input Datetime] = convert(varchar(23),DT,121),
[UNIX Time] = dbo. F_DATETIME_TO_UNIX_TIME(a.dt),
[Datetime from UNIX Time] =
-- Convert datetime to UNIX time an back to Datetime
convert(varchar(23),
dbo. F_UNIX_TIME_TO_DATETIME(dbo. F_DATETIME_TO_UNIX_TIME(a.dt)),121),
Note = .a.note
from
(
selectDT = getdate(),
Note = 'Current date'
union all
selectDT = dateadd(ms,500,getdate()),
Note = 'Current date + 500 ms'
union all
selectDT = dateadd(ms,750,getdate()),
Note = 'Current date + 750 ms'
union all
selectDT = '1901-12-13 20:45:51.500',
Note = 'Earliest datetime function can convert'
union all
selectDT = '2038-01-19 03:14:07.497',
Note = 'Last datetime function can convert'
union all
selectDT = '2001-09-09 01:46:40',
Note ='UNIX time 1000000000'
union all
selectDT = '2005-03-18 01:58:31',
Note = 'UNIX time 1111111111'
union all
selectDT = '2009-02-13 23:31:30',
Note ='UNIX time 1234567890'
union all
selectDT = '1901-12-14 00:00:00.000',
Note = 'Date time dateadd second limit'
union all
selectDT = '1901-12-13 23:59:59.000',
Note = 'Date time dateadd outside second limit'
union all
selectDT = '1901-12-13 20:45:51.497',
Note = 'Date time function cannot convert - low end'
union all
select
DT = '2038-01-19 03:14:07.500',
Note = 'Date time function cannot convert - high end'
union all
select
DT = '1753-01-01 00:00:00.000',
Note = 'Min Datetime'
union all
select
DT = '9999-12-31 23:59:59.997',
Note = 'Max Datetime'
) a


Results:

Input Datetime UNIX Time Datetime from UNIX Time Note
----------------------- ----------- ----------------------- --------------------------------------------
2006-05-29 23:34:11.517 1148945652 2006-05-29 23:34:12.000 Current date
2006-05-29 23:34:12.017 1148945652 2006-05-29 23:34:12.000 Current date + 500 ms
2006-05-29 23:34:12.267 1148945652 2006-05-29 23:34:12.000 Current date + 750 ms
1901-12-13 20:45:51.500 -2147483648 1901-12-13 20:45:52.000 Earliest datetime function can convert
2038-01-19 03:14:07.497 2147483647 2038-01-19 03:14:07.000 Last datetime function can convert
2001-09-09 01:46:40.000 1000000000 2001-09-09 01:46:40.000 UNIX time 1000000000
2005-03-18 01:58:31.000 1111111111 2005-03-18 01:58:31.000 UNIX time 1111111111
2009-02-13 23:31:30.000 1234567890 2009-02-13 23:31:30.000 UNIX time 1234567890
1901-12-14 00:00:00.000 -2147472000 1901-12-14 00:00:00.000 Date time dateadd second limit
1901-12-13 23:59:59.000 -2147472001 1901-12-13 23:59:59.000 Date time dateadd outside second limit
1901-12-13 20:45:51.497 NULL NULL Date time function cannot convert - low end
2038-01-19 03:14:07.500 NULL NULL Date time function cannot convert - high end
1753-01-01 00:00:00.000 NULL NULL Min Datetime
9999-12-31 23:59:59.997 NULL NULL Max Datetime

(14 row(s) affected)




Edit: Fixed minor bug that caused an overflow, instead of returning NULL, if input to function F_DATETIME_TO_UNIX_TIME was >= 9999-12-31 23:59:59.500.


CODO ERGO SUM

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i wonder what is the best approach to use !!!i have creditLimit column in Customer Table the default value will be 500 and this limit to allow users to send sms from my website ..... every month they will be allowed to send 500 sms referring to the credit limit column.... now !!if the user sent today some sms and after few days sent another 20 and after one week he sent 150  SMS as a total so that means he has only 350 SMS as credit to use this month!!!so what is the best approach to implement this solution ? shall i have another field in the table called 'CreditUsed' and that will be updated each time the user will send SMS and this value will be compared with the credit limit ORi use the formula for the column to calculate the credit left and do the maths !!!what is the best approach as you think ???thnaks for reading this question !!

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Formula Parsing
Hi,I have three tables in the following structure (simplified):Table 1: Containing the customers-------------------------------------------------create table Customers([cusID] int identity(1, 1) not null,[cusName] varchar(25) not null)Table 2: Containing the customer data fields---------------------------------------------------------------create table Data([datID] int identity(1, 1) not null,[datName] varchar(25) not null,[datFormula] varchar(1500))Table 3: Containing the customer data values-----------------------------------------------------------------create table Values([cusID] int not null,[datID] int not null,[valValue] sql_variant)In this structure the user can add as many data fields to a customer ashe wants (e.g. Country, City, Email, Phone, ...). I have added triggerswhich create a view similar to a pivot (I am working in SQL 2000) andadd triggers to the view so it is insertable, deletable and updateable.What I would like to do, is allow the user to create new fields wherethe values are based upon a calculation. This calculation would be donethrough a formula similar to what he would do e.g. in excel (thisformula is stored in the dimFormula field then).An example might help. Let's assume the user created a field 'Sales'(containing last year's sales) and 'Invoices' (containing the number ofinvoices that were created for him last year). Now, he wants to createa field 'AvgSales' with the formula '[Sales]/[Invoices]'.(Note that through adding these data fields, the above view was created(let's assume it is called vw_Customers and contains the columns [ID],[Name], [Sales], [Invoices], [AvgSales]).What I am looking for is a function which can parse this formula into at_sql query which runs the calculation. So, the formula'[Sales]/[Invoices]' would be translated into (let's assume there areno records with NULL or zero invoices):update vw_Customersset [AvgSales] = [Sales]/[Invoices]from vw_CustomersI am able to do the above with simple calculations (where you can evenuse sql functions e.g. year, len, ...). Now I would like to take thisone step forward into the possibility of using functions with morevariables.For example. Let's assume, the user wants to add a rating (field called'Rating') to his customers based upon the result of 'AvgSales. Heenters the formula 'if([AvgSales] > 2500, 'A', 'B')'.If anyone could help me on this, I would be very grateful. Thanks.M

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Formula Problem
env: sql server 2000objective:add a formula for an INT column to the FORMULA field or the DEFAULTVALUE field in DESIGN VIEW.all of the following attempts failedIIF (columnName = 0, "1", columnName + 1)IIF (columnName = 0, 1, columnName + 1)IIF (0, "1", columnName + 1)caveat: cannot use IDENTITYREASON: I'd like have sets of repeatable values for this row, e.g.set a1 -- row 12 -- row 2345set b1 -- row 623set c1 -- row 9234Underlying rationale is to support OO design I understand probably it'sgoing to be huge headache for lots of people down the road but ...TIA.

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Formula Column.
HI,I have a problem in formula column.I have 8 1 bit varibles in a tablefor ex: Flag1, falg2, flag3 ...Flag8Now I want to create another variable as a small integer and copy allthe flgas to that field.For ex:(flag1 << 0x80) | (flag2 << 0x40) | ..... | flag8I tried all possible ways?Let me know how to write the formula for this column.Thanks,Venkat.

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Formula Column
Hi,I would like to create a calculated column using the formulasection for a table. I am having some trouble doing this.The table's name is ReportParameter. The calculated column's name istbcalculatedcolumn and tb1 and tb2 are boolean columns in the table.I would like to use an If then statement such as the following (inpsuedo code):If tb1 = 1 then tbcalculatedcolumn = 1Elseif tb2 = 1 then tbcalculatedcolumn = 2EndifThanks for the help,Bill

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Formula Columns
Can anyone tell me how to find out if a column is a 'formula' or computed column - and what the formula is?

sp_columns @table_name = 'table' gives me most of the stuff I want but it doesn't show what the formula is for any formula columns...

Cheers in advance,

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Using The Formula Proprity
I want to use the proprity Formula related to a column propreties :
Exempel : table XFRS i want to pupulate the field XF2 (int 4) using the value of another Field XF1 (int 4) Which is an identity field.
But When i try to insert into the table XFRS then i had an error
"Insert faild because the following set options have incorrect settings"
'ARITHABORT'"

Anyone to help me ? Thinks

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SQL Formula Field
so this should be easy, but I cant seem to find any documentation on this.

I have 8 tables (one of which is a summary table).
I'm using the SQL Enterprise manager and went into the database to design my tables. I need one of the columns in the summary table to sum up the values from the corresponding rows in the other 7 tables. I'm trying to use the formula field but I cant seem to get it right. Keeps throwing back a formatting error.

Does anyone know the correct format or have an example of what should go in this field?

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Cross Tab Formula
in front end application,iam using pivot table,there is no option to create the growth rate calcuation/formula in FE.

my table data consists like below:
country_name Revenue PERIOD_TYPE_OUT Amount_out
UK Solutions01 Apr 2007 To 31 Mar 200856.83000000
UK Solutions01 Apr 2006 To 31 Mar 2007116.07000000

while iam using the cross tab in front end application data view is coming as
country_name

01 Apr 2006 To 31 Mar 2007 01 Apr 2007 To 31 Mar 2008
solution solution
uk 116.07 56.83


Actual o/p should be:

01 Apr 2006 To 31 Mar 2007 01 Apr 2007 To 31 Mar 2008 Growth
solution solution
uk 116.07 56.83 -0.51


can anybody tell how to calcualate growth in stored procedure level formala for calculating growth rate
is :
(56.83-116.07)/116.07
([current year]-[previous year])/[previous year]

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Cast Formula
I have a quick question. created a report with this formula below. It works when I put a date range from 1-1-2007 to 2-1-2007, but when I put in a date range of 03-01-2008 through 03-31-2008. i get an error message of arithmetic overflow error converting numeric to data type numberic.

So instead of haveing the formula below be (4,2) I put it as (5,2) and now it work. Why is that?

CAST(clm_sppo / clm_tchg * 100 AS decimal(4, 2)) AS PercentSavings

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SQL Formula Error
SELECT ID, CalibScoreAVGQA,
COUNT(CalibScoreAVGQA) AS Expr1
FROM dbo.TechPhonesCalibScoreAVGQA

Any idea why I'm getting "dbo.TechPhonesCalibScoreAVGQA.ID is invalid in the select list because it is not contained in an aggregate function and there is no GROUP BY clause

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Maths Formula's In SQL
Hi,

I want to store, mathematical formulas, in SQL, now how can i store integration signs, fractions, and various types of other symbols.

The output must be on html page using ASP. and also on VB frontend.

Pls. assist.

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How To Put Formula In Sql Filed
i have two tables .Table 1 contains certain columns with values.Table 2 shud get those data from table1 into its column and display the calculated result. Any idea how do i go abt it,bcuz table2 shud contain a formula so as to calculate.

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Sql Script Formula
 

hy guys
i am trying to calculate a formula in sql, but
in the field lbs1 sometimes has ceros and the lbs2 sometimes has ceros as well
 
the resul of the formula is null, but this is supposed to be a value. the rest of fields always have data.
 
SQRT((((db_linear_density_1.[Linear density_1] * dbo.Assay_acquire.[lbs1(Kg)] + PD_Data.dbo.db_linear_density.[Linear density_2] * dbo.Assay_acquire.[lbs2(Kg)]) / (dbo.Assay_acquire.[lbs1(Kg)] + dbo.Assay_acquire.[lbs2(Kg)])) * ((dbo.HOLELOCATION.DEPTH - PD_Data.dbo.drillhole_base_MOR_MET_2004.stem) * 0.3048)) / (((dbo.Assay_acquire.[lbs1(Kg)] + dbo.Assay_acquire.[lbs2(Kg)]) / dbo.Assay_acquire.holetons) * (dbo.Assay_acquire.holetons / (dbo.HOLELOCATION.DEPTH * 0.3048 * dbo.Assay_acquire.[holearea(m2)]))) / 15) * 0.9325
 
cheers

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Need Help To Formula Sql Query For The Following
Table A                                                    Table B

101 Martha Steward Corp                       101 Martha Steward

102 Gloria Gardens                                101 John Pickle

103 Judi's Hockey Service                      101 Ray Lettuce

104 Randy Bowling Ball                          101 Mike Salad

105 Byron Ad Agency                            102 Gloria Williams







102 Bob Jeans

103 Judi McClair

103 John Nolte

104 Randy Koolaid

104 Ike Smith

104 Blade McRay

105 Byron Exec

105 Jim Rayburn

SQL result list

CustID        Customer                 Contact1               Contact2              Contact3

101     Martha Steward Corp         Martha Steward    John Pickle           Ray Lettuce

102     Gloria Gardens                  Gloria Williams     Bob Jeans            null

103     Judi's Hockey Service        Judi McClair          John Nolte           null

104     Randy Bowling Ball            Randy Koolaid      Ike Smith             Blade McRay

105     Byron Ad Agency              Byron Exec          Jim Rayburn         null

 
My knowledge level? create a scalar procedure to loop thru Table B using cursor three time to bring back one contact at a time. this just seem inefficient. can I make one pass thru the data. 

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Reverse Formula
 

Hi . My database seems to be somehow encrypted by the software I used. When I try to export my data some fields are encrypted like this:
 

1 => 31911
2 => 63758
3 => 95540
4 => 127258
5 => 158912
6 => 190504
7 => 222032
8 => 253498
 
I'm really sure it's not some complicated formula (because I managed to recover other fields) . I just want to reverse the formula used to "encrypt" this data.
Thank you. Excuse my english.

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Formula Question
I have this crystal formula

How can this be converted to a reporting services Expression

 

if {ITEMCODE} in ["A","B"]

then "TypeA"

else  if

 {ITEMCODE} in ["C","D"]

then "TypeB"

else

"TypeC"

 

 

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Placing A Formula
 

Hi everyone, I have a small dilema here. I am running SSRS 2000, and I have a report that is grouped by Part Number. I have   =Fields!Formula.Value < .1     so I can view only what is greater than .1   Well, my problem is that when I put it under the group Visibility properties, it does not pull all the data. and if i put it under detail Visibility. It does show me everything but any Part Number that is less than .1 shows just the part number but no detail. How can I make my report show all my data but without leaving data out????
 
Thanks ahead of time,
 
Abner

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Excel Formula
 

I have two colums with two different date ranges







1/2/08 11:41 AM

1/4/08

12/27/07 9:38 AM

12/27/07

12/27/07 12:55 PM

1/2/08

1/4/08 11:20 AM

1/4/08
 
 
In the third column I'm trying to stated if the dates are different but when i change the first column to show just the date and not the time it still says they are different.  How can i round or  change the first column to just reflect the date and not the time so i can compare it to the second column.












 











 
 
 
 
 
 

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Sum Formula That Always Adds To Zero
OK, I'm new to Excel 2007 but have used excel for a long time.  I have a column of numbers and I'm trying to add them up.  I click Sum, I highlight to cells I want to add and hit enter and it comes up with zero.  The formula looks fine =SUM(G125:G127) and there are numbers in those cells (that don't add to zero) but it keeps adding them to zero.  Can someone tell me why before I put my fist through my monitor?
 
When I go in and just click on once cell and then hit + and then another and + and another and + and then hit enter, I get #VALUE.  So there must be something about how the numbers in the cells are formatted??  They look like numbers to me?
Thanks, Peter

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