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convert DateTime to BigInt


convert DateTime to BigInt

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munishprathap
munishprathap
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i need to convert DateTime to BigInt through query in SQL
plz let me know
Old McDonald
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use CONVERT or CAST function

-Vikas Bindra
munishprathap
munishprathap
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Thanks for ur reply
but i need to convert a column of table which has datetime type
please let me kno the Query
ChrisM@Work
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munishprathap (1/19/2009)
i need to convert DateTime to BigInt through query in SQL
plz let me know


What does this column presently contain? Can you post a range of values?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
munishprathap
munishprathap
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its a new table didnt hav any values in that column.
assume that column 1 has Id as bigint ,column 2 has Date as datetime
my aim is to alter the column 2 type as bigint and column 1 as identity column
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Should have mentioned in the first post...
If there is no data in the table you can use ALTER TABLE...

-Vikas Bindra
ChrisM@Work
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munishprathap (1/19/2009)
its a new table didnt hav any values in that column.
assume that column 1 has Id as bigint ,column 2 has Date as datetime
my aim is to alter the column 2 type as bigint and column 1 as identity column


This looks like a straightforward operation - can you post your current table structure?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Jeff Moden
Jeff Moden
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This is absolutely the wrong thing to do. Dates should not be stored as integers.

What are the business rules stating that you should convert the column from a DATETIME datatype to BIGINT? In other words, why do they want to do this?

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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munishprathap
munishprathap
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Thanks Jeff
according to my requirement i need to keep the one column type as bigint but unfortunately
i keep it as DateTime after long time i found that it was DateTime Type. so i need to write
a Script / Query which updates the Column field type as BigInt from DateTime and set the ID Column as
Identity with primary key.

My Table Script

CREATE TABLE [dbo].Number (
[ID] [BIGINT] NOT NULL,
[LastModifyBy] [DATETIME] NOT NULL)
Sergiy
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So, for some time bigint values were inserted into datetime column?
And now you need to restore them as bigint?
Is it right?
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