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How To Filter Blank Dates in Query

How To Filter Blank Dates in Query

How To Filter Blank Dates in Query

I have a table that contains a date field (dtnDOB).  I want to pull all records from this table that have a value in this field.  I've tried the following queries with no luck:

select * from <table> where dtndob<>''
select * from <table> where dtndob<>0
select * from <table> where dtndob>0

I'm not sure how to for the WHERE clause so that the result set excludes blank dates.

RE: How To Filter Blank Dates in Query

I forgot to mention that the dtnDOB field allows null values, and I am using PSQL v 8.6.

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