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search SQL table for null in each column

Posted on 2014-03-31
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Last Modified: 2014-03-31
Hi Experts,

is there an easy(ish) way to run a select statment to run across each colum to see if there are null values?

thanks

Simon
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Question by:SimonPrice33
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edtechdba earned 1000 total points
ID: 39966324
It sounds like checking to see which columns can be nullable first may help, here's an example below.
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMS
WHERE TABLE_SCHEMA = 'dbo'
  AND TABLE_NAME = 'YourTable'
  AND IS_NULLABLE = 'YES'

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Then take your column names from the query above and add them to the WHERE clause below.

SELECT *
FROM YourTable
WHERE (col1 IS NULL
  OR col2 IS NULL
  OR col3 IS NULL)
  -- and so on until you've included all columns that are nullable

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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 39966337
do you mean NULL in all columns for a single row?
I agree there is nothing "simple", the only way is the one above, as you have to consider that for columns that cannot be null there will be some "default" value (at least).
you might want to consider such "default values" to be like a NULL value for your consideration...
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Author Closing Comment

by:SimonPrice33
ID: 39966374
Im not checking to see if they are nullable, i was hoping that i wouldnt have to specify each column but thought that would be the only way.

thanks

simon
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LVL 9

Expert Comment

by:edtechdba
ID: 39966401
If there are columns that are not nullable in your table, then you'll reduce the # of columns when searching for NULL values if you run first query before checking for NULL values.

Just a thought. Thank you.
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Author Comment

by:SimonPrice33
ID: 39966411
the genuis who put this together made all fields nullable...
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 39966526
sorry, you will have to bite the nail here...
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