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What does 'Select * into" actually does

Posted on 2011-02-10
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Last Modified: 2012-05-11
What does "SELECT * INTO " do?
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Question by:rayluvs
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Kelvin Sparks earned 187 total points
ID: 34866184
This is normally an Access statrmrnt and is the "Make table" command. SELECT INTO MyTable will create MyTable and insert the records. If MyTable exists and DoCmd.SetWarnings False is set, then the exiisting table will be overwritten

Kelvin
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by:Kelvin Sparks
ID: 34866194
Duh, just noticed this is a SQL 2005 question. Not sure if behaves the same there
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by:Dale Burrell
Dale Burrell earned 126 total points
ID: 34866204
And its pretty much the same for SQL Server as well. You need to name your table as a temporary table. And the order by clause isn't honoured in SQL Server.

select * into #Temp from MyTable
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by:Anil Golamari
Anil Golamari earned 63 total points
ID: 34866259
Select into will be used to create a backup for your tables (Mostly). This can be used to copy a data of a table from one table to other table. And you can also use IN to copy it to other database.

SELECT *
INTO Backuptablename  IN 'backupdatabase''
FROM tablename

SELECT *
INTO table2
FROM table1

SELECT *
INTO Backuptablename
FROM tablename

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by:Dale Burrell
Dale Burrell earned 126 total points
ID: 34866354
I would disagree with "Select into will be used to create a backup for your tables (Mostly)" - I use it all the time for creating a temporary table of data especially in stored procedures and triggers where I need to serialise operations etc. Or any other time when a need to temporarily store a result set.
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by:Kelvin Sparks
ID: 34866393
OK, so it is the same as Access. It creates a table of the data your selected - for whatever prupose needed.

Kelvin
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by:rayluvs
ID: 34866448
Ok... I understand it creates a table automatically... will it create also the origin table's definition, keys etc.?

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by:Kelvin Sparks
Kelvin Sparks earned 187 total points
ID: 34866475
Not necesarily, as the source may be a select statement based on a number of tables (i.e. a view). You may well have to follow with an ALTER TABLE statement to do this
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by:Qlemo
Qlemo earned 62 total points
ID: 34866574
"Not necessarily" doesn't do it justice - never is correct. A select into just creates a table with columns having datatypes resulting from expressions. No metadata is copied, in particular NOT NULL/NULL, DEFAULT, Identity aso. And no index or keys. Imagine what would happen if you write:
   select 'one' as One, obj.* into newtmp from sysobjects obj;
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Author Comment

by:rayluvs
ID: 34866713
Thats importane info... "SELCT INFO" does not copy table structure.
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by:Kelvin Sparks
Kelvin Sparks earned 187 total points
ID: 34866731
It just creates in a new table datatypes of the same type as the the source field (and data)
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by:ldunscombe
ldunscombe earned 62 total points
ID: 34867573
If you need to maintain the table structure, indexes etc I generally do it this way.

Create a table with a make table query.
Set all the data types, indexes etc how I need them

And then instead of using a make table query I use a combination of a Delete and append queries.
ie Instead of re-creating the table each time simply Delete the existing Data and Append the New.

This is not suitable in ALL situations, but something that may help.

Leigh
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Author Comment

by:rayluvs
ID: 34867708
Thanx to all
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Author Closing Comment

by:rayluvs
ID: 34867732
Thanx
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