title: sql sentence with wildcards and null values
body: <p>i got 4 combo boxes with values and could also be wildcards '%'.
  As you know the NULL values are not returned.</p>
  
  <p>I used the (COLUMN_NAME LIKE 'VALUE' OR COLUMN_NAME IS NULL), it worked in some way but it's not what i need.
  What i need would be to return also the NULL values for example in this case:</p>
  
  <pre><code>NAME = '%'
  LASTNAME = '%'
  ZIPCODE = '12345'
  EMAIL = '%'
  </code></pre>
  
  <p>Basically, i want this to return all the ZIPCODE like '12345' and also the null values from the other 3 (NAME, LASTNAME, EMAIL).</p>
  
  <p>Don't know if i'm being clear :(</p>
  
  <p>If i'm not, let me know,</p>
  
  <p>How can I achive this?
  Thanks in advance.</p>