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sql server new users
group:Query help finding empty or null columns
sql server new users:
I need someway of locating all the columns in a table where the entire
column is either NULL or ''. Does anyone know an easy way to do this against a table with about 30 columns? Or any suggestions??? Column 1 Column 2 Column 3 -------- -------- -------- 1 NNN 2 NNYIUI In the above example it would let me know that Column 2 doesn't have data and or if it could let me know about column 1 and 3 I can figure out Column 2 is the one I'm looking for.
This counts the non-NULL/blank values. Note that Column1 was assumed
to be some number data type (int, decimal, etc) and so there is no code to handle blanks. Any count of zero indicates a column with only NULL or blank. SELECT COUNT(*) as Total, COUNT(Column1) as Column1, COUNT(CASE WHEN Column2 = ' ' THEN NULL ELSE Column2 END) as Column2, COUNT(CASE WHEN Column3 = ' ' THEN NULL ELSE Column3 END) as Column3 FROM SomeTable Roy Harvey Beacon Falls, CT On Thu, 11 Oct 2007 09:51:23 -0400, "Jamie" [quoted text, click to view] <Jlawson01@OMITTHIS.lear.com> wrote:
>I need someway of locating all the columns in a table where the entire >column is either NULL or ''. > >Does anyone know an easy way to do this against a table with about 30 >columns? Or any suggestions??? > >Column 1 Column 2 Column 3 >-------- -------- -------- >1 NNN >2 NNYIUI > >In the above example it would let me know that Column 2 doesn't have data >and or if it could let me know about column 1 and 3 I can figure out Column >2 is the one I'm looking for.
Getting error
Incorrect syntax near the keyword 'FROM'. END) as Receipt_ASN, FROM labels Last two lines of code. [quoted text, click to view] "Roy Harvey (SQL Server MVP)" <roy_harvey@snet.net> wrote in message news:h4dsg3p35hlts63gmd65b5ujg0ds7pa04i@4ax.com... > This counts the non-NULL/blank values. Note that Column1 was assumed > to be some number data type (int, decimal, etc) and so there is no > code to handle blanks. Any count of zero indicates a column with only > NULL or blank. > > SELECT COUNT(*) as Total, > COUNT(Column1) as Column1, > COUNT(CASE WHEN Column2 = ' ' > THEN NULL > ELSE Column2 > END) as Column2, > COUNT(CASE WHEN Column3 = ' ' > THEN NULL > ELSE Column3 > END) as Column3 > FROM SomeTable > > Roy Harvey > Beacon Falls, CT > > On Thu, 11 Oct 2007 09:51:23 -0400, "Jamie" > <Jlawson01@OMITTHIS.lear.com> wrote: > >>I need someway of locating all the columns in a table where the entire >>column is either NULL or ''. >> >>Does anyone know an easy way to do this against a table with about 30 >>columns? Or any suggestions??? >> >>Column 1 Column 2 Column 3 >>-------- -------- -------- >>1 NNN >>2 NNYIUI >> >>In the above example it would let me know that Column 2 doesn't have data >>and or if it could let me know about column 1 and 3 I can figure out >>Column >>2 is the one I'm looking for. >>
Found the answer:
[quoted text, click to view] > END) as Receipt_ASN > FROM labels "Jamie" <Jlawson01@OMITTHIS.lear.com> wrote in message news:eh7Sz7BDIHA.3916@TK2MSFTNGP02.phx.gbl... > Getting error > Incorrect syntax near the keyword 'FROM'. > > END) as Receipt_ASN, > > FROM labels > > Last two lines of code. > > "Roy Harvey (SQL Server MVP)" <roy_harvey@snet.net> wrote in message > news:h4dsg3p35hlts63gmd65b5ujg0ds7pa04i@4ax.com... >> This counts the non-NULL/blank values. Note that Column1 was assumed >> to be some number data type (int, decimal, etc) and so there is no >> code to handle blanks. Any count of zero indicates a column with only >> NULL or blank. >> >> SELECT COUNT(*) as Total, >> COUNT(Column1) as Column1, >> COUNT(CASE WHEN Column2 = ' ' >> THEN NULL >> ELSE Column2 >> END) as Column2, >> COUNT(CASE WHEN Column3 = ' ' >> THEN NULL >> ELSE Column3 >> END) as Column3 >> FROM SomeTable >> >> Roy Harvey >> Beacon Falls, CT >> >> On Thu, 11 Oct 2007 09:51:23 -0400, "Jamie" >> <Jlawson01@OMITTHIS.lear.com> wrote: >> >>>I need someway of locating all the columns in a table where the entire >>>column is either NULL or ''. >>> >>>Does anyone know an easy way to do this against a table with about 30 >>>columns? Or any suggestions??? >>> >>>Column 1 Column 2 Column 3 >>>-------- -------- -------- >>>1 NNN >>>2 NNYIUI >>> >>>In the above example it would let me know that Column 2 doesn't have data >>>and or if it could let me know about column 1 and 3 I can figure out >>>Column >>>2 is the one I'm looking for. >>> > >
By the way thank you for this it worked great.
[quoted text, click to view] "Roy Harvey (SQL Server MVP)" <roy_harvey@snet.net> wrote in message news:h4dsg3p35hlts63gmd65b5ujg0ds7pa04i@4ax.com... > This counts the non-NULL/blank values. Note that Column1 was assumed > to be some number data type (int, decimal, etc) and so there is no > code to handle blanks. Any count of zero indicates a column with only > NULL or blank. > > SELECT COUNT(*) as Total, > COUNT(Column1) as Column1, > COUNT(CASE WHEN Column2 = ' ' > THEN NULL > ELSE Column2 > END) as Column2, > COUNT(CASE WHEN Column3 = ' ' > THEN NULL > ELSE Column3 > END) as Column3 > FROM SomeTable > > Roy Harvey > Beacon Falls, CT > > On Thu, 11 Oct 2007 09:51:23 -0400, "Jamie" > <Jlawson01@OMITTHIS.lear.com> wrote: > >>I need someway of locating all the columns in a table where the entire >>column is either NULL or ''. >> >>Does anyone know an easy way to do this against a table with about 30 >>columns? Or any suggestions??? >> >>Column 1 Column 2 Column 3 >>-------- -------- -------- >>1 NNN >>2 NNYIUI >> >>In the above example it would let me know that Column 2 doesn't have data >>and or if it could let me know about column 1 and 3 I can figure out >>Column >>2 is the one I'm looking for. >>
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