Databases
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POCopying a subset of data to an empty database with the same schema
 

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    <p>I would like to export part of a database full of data to an empty database. Both databases has the same schema. I want to maintain referential integrity.</p> <p>To simplify my cases it is like this:</p> <p>MainTable has the following fields:<br> 1) MainID integer PK<br> 2) Description varchar(50)<br> 3) ForeignKey integer FK to MainID of SecondaryTable</p> <p>SecondaryTable has the following fields:<br> 4) MainID integer PK (referenced by (3))<br> 5) AnotherDescription varchar(50)</p> <p>The goal I'm trying to accomplish is "export all records from MainTable using a WHERE condition", for example all records where MainID &lt; 100.</p> <p>To do it manually I shuold first export all data from SecondaryTable contained in this select:</p> <pre><code>select * from SecondaryTable ST outer join PrimaryTable PT on ST.MainID=PT.MainID </code></pre> <p>then export the needed records from MainTable:</p> <pre><code>select * from MainTable where MainID &lt; 100. </code></pre> <p>This is manual, ok. Of course my case is much much much omre complex, I have 200+ tables, so donig it manually is painful/impossible, I have many cascading FKs.</p> <p>Is there a way to force the copy of main table only "enforcing referntial integrity".</p> <p>so that my query is something like:</p> <pre><code>select * from MainTable where MainID &lt; 100 WITH "COPYING ALL FK sources" </code></pre> <p>In this cases also the field (5) will be copied.</p> <p>======================================================</p> <p>Is there a syntax or a tool (also a not free one, but it must do what I need, not only a subset of the features like "db compare with no options") to do this?</p> <p>Table per table I'd like to insert conditions (like MainID &lt;100 is only for MainTable, but I have also other tables).</p>
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