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POSQL AdvancedQuery
 

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    <p>I have the following data in a table called: dbo.DecodedCSVMessages_Staging </p> <p><strong>Here is a sample of the data:</strong></p> <pre><code>MMSI Message_ID Time Ship_Type Vessel_Name Latitude Longitude 2102930 3 2012-06-01 NULL NULL 56.528003 85.233443 2102930 5 2012-07-01 70 RIO_CUBAL NULL NULL 2109300 1 2012-08-01 NULL NULL 57.43234 131.123343 2109300 1 2012-09-01 NULL NULL 62.432345 121.123343 2109300 1 2012-09-02 NULL NULL 65.432345 140.123343 2109300 5 2012-08-01 70 RIO_CUBAL NULL NULL 2225555 1 2012-08-01 NULL NULL 66.432345 143.123343 2225555 1 2012-09-01 NULL NULL 25.432345 145.123343 2225555 5 2012-08-01 70 RIO_II NULL NULL </code></pre> <p>What I need is as follows:</p> <ul> <li>An MMSI number is a unique number that represents a ship. A ship sends out different information in unique Message types. I am interested in only Message_ID 1's and 3's as they have Latitudinal and Longitudinal Information. MMSI's will be reoccuring in this database (as demonstrated in the data above)</li> <li>Problem is, I need information about the ship which is unfortunately only available in Message_ID 5's. such as Vessel_name and Ship_type. </li> <li><p>I only need ships which fall within the following longitude and latitude</p></li> <li><p><strong>Ship_Type might change! In which case it must reflect the later date</strong></p> <p><strong>where Latitude > 55 and Latitude &lt;85 and Longitude > 50 and Longitude &lt; 141;</strong></p></li> </ul> <p><strong>The result of querying the data</strong> would produce the following (Of which I will save to CSV format as I am using this information to build point features in ArcGIS)</p> <pre><code>MMSI Message_ID Time Ship_Type Vessel_Name Latitude Longitude 2102930 3 2012-06-01 70 RIO_CUBAL 56.528003 85.233443 2109300 1 2012-08-01 70 RIO_CUBAL 57.43234 131.123343 2109300 1 2012-09-01 70 RIO_CUBAL 62.432345 121.123343 2109300 1 2012-09-02 70 RIO_CUBAL 65.432345 140.123343 2225555 1 2012-08-01 70 RIO_II 66.432345 143.123343 </code></pre> <ul> <li><p>So all the Message_ID 5's are gone</p></li> <li><p>The second to last row is gone (as the Latitude was only 25.432345)</p></li> <li><p>The information Ship_Type and Vessel_Name has been added to the Message_ID 1's and 3's by way of linking using the MMSI.</p></li> </ul> <p>RESTRAINTS:</p> <ol> <li>Cannot create a new table (do no have access)</li> <li>There are over a billion rows of data in this database (only about 4.3 million that meet the latitude/longitude constraints though</li> </ol> <p><strong>WHAT MIGHT THE QUERY BE??? tHANKS!</strong></p>
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    1. COCan Ship_Type and Vessel_Name change for same MMSI?
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    2. COWhat is the difference to [yesterday's question](http://stackoverflow.com/questions/18828568/sql-table-creation-from-joining-data)? There are detailed answers to start working with.
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    3. CO@dpalm "It shouldn't" = "it does". It will require further complexity to gain this answer, it is up to you to tell us if the performance hit is too great. I will update my answer shortly to reflect this.
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