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Empty space may refer to:

Physics[edit]

• Outer space, especially the relatively empty regions of the universe outside the atmospheres of celestial bodies
• Vacuum, a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure
• Free space, a perfect vacuum as expressed in the classical physics model
• Vacuum state, a perfect vacuum based on the quantum mechanical model
• In mathematical physics, the homogeneous equation may correspond to a physical theory formulated in empty space
• Void, empty space.

Arts and literature[edit]

• Empty Space, a novel by M. John Harrison
• The Empty Space, a 1968 book by the British director Peter Brook
• Empty Space Peter Brook Award, an annual prize awarded to a British theatre

Music[edit]

Albums[edit]

• Empty Space (album), a 2003 album by Lycia
• Empty Space, a 2011 album by Buckethead

Songs[edit]

• 'Empty Space' (song), a 2018 song by James Arthur
• 'Empty Space', a song by British band Air Traffic
• 'Empty Space', a 2003 album by the darkwave band Lycia
• 'Empty Space', a song by California pop punk band The Story So Far

See also[edit]

• Negative space, in typography

In most cases a dataware house includes string columns which are either nullable or not nullable. So lets assume you have a table with the following structure:

1. CREATETABLE BLANK_TEST ( ID INTNOTNULL, Testname NVARCHAR(100)NOTNULL, Blank NVARCHAR(100)NULL, Comment NVARCHAR(100)NOTNULL)WITH(DISTRIBUTION =REPLICATE)

The DWLoader gives you two parameters to modify the load process:

Parameter –c:

Removes white space characters from the left and right side of char, nchar, varchar, and nvarchar fields. Converts each field that contains only white space characters to the empty string. Examples: ' ' gets truncated to ' ' abc ' gets truncated to 'abc' The important part is the following sentence right at the bottom:

When –c is used with -E, the –E operation occurs first.

Fields that contain only white space characters are converted to the empty string, and not to NULL. Parameter –E: Convert empty strings to NULL. The default is to not perform these conversions.

So let’s see what happens when playing with the options:

Let’s create 5 CSV Files with each on line. Store them under the Name oft he ID.

ID;Testname;Blank;Comment

1;Parameter -E;;Converted to NULL

2;Parameter -c; ;Blank removed

3;Parameter –c;;Nothing to remove

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4;Parameter –E –c;;Converted to Null due to missing blank

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5;Parameter –E –c; ;Converted to Blank

Use the prepaid statements to load the flatfiles into the table. Please adjust to your own needs.

1. 'C:Program FilesMicrosoft SQLServer Parallel Data Warehouse100dwloader.exe' -T Test_DB..Blank_Test-U test -P test -t ';' -R c:test1.reject-i c:test1.csv-E
2. 'C:Program FilesMicrosoft SQLServer Parallel Data Warehouse100dwloader.exe' -T Test_DB..Blank_Test-U test -P test -t ';' -R c:test2.reject-i c:test2.csv-c
3. 'C:Program FilesMicrosoft SQLServer Parallel Data Warehouse100dwloader.exe' -T Test_DB..Blank_Test-U test -P test -t ';' -R c:test3.reject-i c:test3.csv-c
4. 'C:Program FilesMicrosoft SQLServer Parallel Data Warehouse100dwloader.exe' -T Test_DB..Blank_Test-U test -P test -t ';' -R c:test4.reject-i c:test4.csv-E -c
5. 'C:Program FilesMicrosoft SQLServer Parallel Data Warehouse100dwloader.exe' -T Test_DB..Blank_Test-U test -P test -t ';' -R c:test5.reject-i c:test5.csv-E -c

After executing the statements we will check the result :

Test 1: –E is used which will convert the blank into NULL

Test 2: -c is used and will remove the space. No conversion into NULL

Test 3: -c is used and result stays the same.

Test 4: -E –c is used which will convert into NULL

Test 5: -E –C is used and the space will be removed without converting to NULL

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So in general it is possible to load NULLs as well as blanks. In order to do so you have to add a fake space into the expected column. The easiest way is probably to use ETL to transform the expected column. Please keep in mind that –c gets rid of all whitespaces.

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