Compare Two columns and update the Third Column

• nuhassan786

  Mr or Mrs. 500

  Points: 524

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  May 21, 2008 at 2:49 am

  #185815

  Hi,

  I have three columns and want to update the third column based on the comparison of first two columns in the same table.

  For instance:

  Col1 - val1, val2, val3, val4, val5......

  Col2 - NULL, NULL, val1, NULL, val2....

  Col3 - TRUE, TRUE, FALSE, FALSE, FALSE....

  Thanks for any help.

• Johan Bijnens

  SSC Guru

  Points: 135368

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  May 21, 2008 at 3:44 am

  #818437

  check BOL for the case statement;

  update mytable

  set col3 = case when col1='abc' and col2 = 'def' then col4

  else Col3 -- if you don't code the else, it will perform set NULL !!

  end

  where col5 = 123

  Johan
  
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