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POtransform the content of relational table to the specified form using SQL
 

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  1. POtransform the content of relational table to the specified form using SQL
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    <p>I have a database which contains the following columns:</p> <pre><code>key arg1 arg2 arg3 timebegin timeend #1 a b c 1942-06-18 05:30:00+05:30 1945-06-18 05:30:00+05:30 #2 d e f 1940-10-09 05:53:20+05:53:20 1948-10-09 05:53:20+05:53:20 #3 w x y </code></pre> <p>The type of key, arg1, arg2, arg3 is character varying (255) and type of timebegin and timeend is timestamp with time zone.</p> <p>Now I want to transform the relational table to the format given below:</p> <pre><code>&lt;1&gt; &lt;a&gt; &lt;b&gt; &lt;c&gt; //key,arg1,arg2,agr3 &lt;2&gt; &lt;d&gt; &lt;e&gt; &lt;f&gt; &lt;3&gt; &lt;w&gt; &lt;x&gt; &lt;y&gt; &lt;1&gt; &lt;a&gt; &lt;b&gt; 1942-06-18 05:30:00+05:30 //With columns containing time attributes just key, arg1, arg2, timebegin are copied. &lt;1&gt; &lt;a&gt; &lt;b&gt; 1945-06-18 05:30:00+05:30 &lt;1&gt; &lt;d&gt; &lt;e&gt; 1940-10-09 05:53:20+05:53:20 &lt;1&gt; &lt;d&gt; &lt;e&gt; 1948-10-09 05:53:20+05:53:20 </code></pre> <p>Is it possible to convert the relational table to the format given above using SQL. I know that one can dump the contents of a relational table into csv format. But is it also possible to transform the content of relational table to the specified form given above. My database is in postgres 9.1</p> <p>**</p> <p>*> EDIT: RULES:</p> <blockquote> <p><strong>1. First from all rows key, arg1, arg2, arg3 are copied and then 2. For all rows containing NOT NULL timebegin and timeend values: key,arg1,arg2,timebegin and key,arg1,arg2,timeend is copied*</strong></p> </blockquote> <p>**</p> <p>Note: It does not matter to me whether "&lt;>" are placed or not. </p>
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    1. COIt may be possible, but it may not be worthwhile. What are the precise rules for your output format? Would a non-relational intermediate program be appropriate here?
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    2. CO@DougM Yes a non-relational intermediate program would also do.
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    3. CO@DougM The precise rules of my output format is to convert: key, arg1, arg2, arg3 in one row and just add <> around each value. With rows in which timeBegin and timEnd is not NULL the output format is: key,arg1,arg2,timeBegin,timeend with <> placed around values of type charater and quotes placed along values of type timeBegin and timeEnd. Thanks a lot for replying
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