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POSyncing primary key between two tables stored in two different database
 

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  1. POSyncing primary key between two tables stored in two different database
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    <p>I have two MySQL database that contain two table, let's call them TABLE_A and TABLE_B. Both these tables have as fields <code>id</code> and <code>title</code>. Both databases are on the same server and the same user can access both.</p> <p>Now, TABLE_A is a subset of TABLE_B for what concern the <code>title</code> field. It means that every <code>title</code> in TABLE_A is present in TABLE_B, too. While <code>id</code> fields of the two table are in no way related.</p> <p>What I need is to sync <code>id</code> fields in TABLE_A with <code>id</code> fields in TABLE_B, according to the title, i.e. same <code>title</code>, same <code>id</code>. If it's not clear, I have to save TABLE_B <code>id</code> and override TABLE_A ones. And I DON'T have to add missing <code>title</code> from TABLE_B to TABLE_A.</p> <p>Someone suggested to use a temporal table where to copy all TABLE_B fields in common with TABLE_A and then rename it as TABLE_A. I cannot follow this way, as TABLE_A actually has also other fields that I need to maintain. So, I cannot entirely drop the old TABLE_A.</p> <p>Moreover, <code>id</code> is the primary key for both tables. It means that I cannot simply copy from TABLE_B to TABLE_A as the query will fail as soon as I try to change one <code>id</code> to another one that is already present in TABLE_A but linked to a different <code>title</code>.</p> <p>I know how to write a Perl or PHP script to do it, but I would like to know if a pure MySQL solution exists.</p>
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    1. USZagorax
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    1. COYou may wish to consider dropping the primary key, applying the updates, then re-add the primary key.
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      1. POSyncing primary key between two tables stored in two different database
      1. USMarcus Adams
 

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