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    <pre><code>use test db.test.insert({a:1}) db.test.insert({a:2, Date2:new Date("01/07/2012")}) db.test.insert({a:3, Date2:new Date("01/08/2012")}) db.test.insert({a:4, Date1:new Date("01/07/2012"), Date2:new Date("01/07/2012")}) db.test.insert({a:5, Date1:new Date("01/07/2012")}) db.test.insert({a:6, Date1:new Date("01/08/2012")}) </code></pre> <p>first subquery db.test.distinct('a', {...});</p> <blockquote> <p>[1, 2, 3]</p> </blockquote> <p>second subquery db.test.distinct('a', {...});</p> <blockquote> <p>[ 1, 5, 6 ]</p> </blockquote> <pre><code>(Date1 == null || Date1 &lt;= today) &amp;&amp; (Date2 == null || Date2 &lt;= today) </code></pre> <p>unwind</p> <pre><code>Date1 == null &amp;&amp; Date2 == null || Date1 == null &amp;&amp; Date2 &lt;= today || Date1 &lt;= today &amp;&amp; Date2 == null || Date1 &lt;= today &amp;&amp; Date2 &lt;= today || </code></pre> <p>query</p> <pre><code>db.test.find( { $or : [ {$and: [ {"Date1": {"$exists": false}}, {"Date2": {"$exists": false}} ]}, {$and: [ {"Date1": {"$exists": false}}, {"Date2": { "$exists": true, "$lte": new Date("2012-01-07T04:45:52.057Z")} } ]}, {$and: [ {"Date2": {"$exists": false}}, {"Date1": { "$exists": true, "$lte": new Date("2012-01-07T04:45:52.057Z")} } ]}, {$and: [ {"Date2": { "$exists": true, "$lte": new Date("2012-01-07T04:45:52.057Z")} }, {"Date1": { "$exists": true, "$lte": new Date("2012-01-07T04:45:52.057Z")} } ]} ] }) &gt;[ 1 ] </code></pre> <p>this should work too (assume that 'not exist' and 'null' is the same)</p> <pre><code>db.test.find( { $and : [ {$or: [ {"Date1": null}, {"Date1": { "$lte": new Date("2012-01-07T04:45:52.057Z")} } ]}, {$or: [ {"Date2": null}, {"Date2": { "$lte": new Date("2012-01-07T04:45:52.057Z")} } ]} ] } ) </code></pre>
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    1. POCombine two $or statements
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    1. POCombine two $or statements
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    1. COHmml.. this is an interesting approach. I havent thought of my query like this. I am going to try it and report back. Thanks!
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    2. COThanks for helping me open my mind to a different way to construct this query. Your solution does satisfy my requirements, though I suspect your query becomes much more complicated as additional or's are needed. Thank you!
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    3. COgood solution. Thanks!!
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