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POOracle: SQLPlus Query Concatenate Data With Headers
 

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  1. POOracle: SQLPlus Query Concatenate Data With Headers
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    <p>I'm trying to not only query different tables in my database and export them into a CSV, but also export data from multiple tables and concatenate them as columns into this CSV.</p> <p>I start with the premise of being able to spool the contents of a table into a CSV file:</p> <pre><code>set colsep ',' set echo off set feedback off set linesize 1000 set sqlprompt '' set headsep off spool file.csv select * from messages; </code></pre> <p>Now I want to grab certain components of multiple tables with no avail (with union and minus):</p> <pre><code>select col1, col2, col3 from messages union select col1, col2 from messagedata union select col1 from extradata; </code></pre> <p>In trying the above method, I'll get <code>ORA -1789 query block has incorrect number of result columns</code> meaning that I'm trying to match up the wrong number of columns (which I'm trying to avoid by just appending columns in my output).</p> <p>And given either <em>union</em> or <em>minus</em> it will error on the wrong datatype, but that being because it's just trying to append it to the columns from my first query.</p> <p>My goal there is to create a query that produces similar output: </p> <pre><code>| col1(messages) | ... | col2(messagedata) | ... | col3(extradata) | ----------------------------------------------------------------------- message ,... ,messagedata ,... ,extradata message ,... ,messagedata ,... ,extradata message ,... ,messagedata ,... ,extradata </code></pre> <p>So two questions:</p> <ul> <li><p>Is it possible for me to concatenate the data from multiple tables into a column output like above? As in create <em>new</em> columns to output instead of appending to existing columns?</p></li> <li><p>How might I give a header to my data (custom or already defined by the identifier in the table) at the top of the column?</p></li> </ul>
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    1. COYou want to `JOIN` these table rather than `UNION`. Now how are the tables related to each other?
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    2. COYou can't output into columns independently. A column is a part of a row. Even if you don't have any relations between tables then you need to `JOIN` them using row number for example.
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