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POPostgres update with an inner join across 2 tables?
 

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  1. POPostgres update with an inner join across 2 tables?
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    <p>I have 3 tables in my local Postgres database:</p> <pre><code>[myschema].[animals] -------------------- animal_id animal_attrib_type_id (foreign key to [myschema].[animal_attrib_types]) animal_attrib_value_id (foreign key to [myschema].[animal_attrib_values]) [myschema].[animal_attrib_types] -------------------------------- animal_attrib_type_id animal_attrib_type_name [myschema].[animal_attrib_values] -------------------------------- animal_attrib_value_id animal_attrib_value_name </code></pre> <p>At runtime I will know the <code>animal_id</code>. I need to run SQL to update the <code>animal_attribute_value_name</code> associated with this item, so something like:</p> <pre><code>UPDATE animal_attribute_values aav SET aav.animal_attribute_value_name = 'Some new value' WHERE # Somehow join from the provided animal_id??? </code></pre> <p>I may have to do some kind of nested <code>SELECT</code> or <code>INNER JOIN</code> inside the <code>WHERE</code> clause, but not sure how to do this. Thanks in advance!</p> <p><strong>Edit</strong>:</p> <p>Let's say I have an <code>animal</code> record with the following values:</p> <pre><code>[myschema].[animals] -------------------- animal_id = 458 animal_attrib_type_id = 38 animal_attrib_value_id = 23 </code></pre> <p>And the corresponding <code>animal_attrib_value</code> (with id = 23) has the following values:</p> <pre><code>[myschema].[animal_attrib_values] -------------------------------- animal_attrib_value_id = 23 animal_attrib_value_name = 'I am some value that needs to be changed.' </code></pre> <p>At runtime, I only have the <code>animal_id</code> (458). I need to look up the corresponding <code>animal_attrib_value</code> (23) and change its <code>animal_attrib_value_name</code> to <code>'Some new value'</code>, all inside of a single UPDATE statement.</p>
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    1. USIAmYourFaja
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    1. COWhat is the meaning of the [] around the identifiers?
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    2. COnothing, just there for visual appeal; helps me see "segments" (schemas, tables, fields) that much easier; guess i borrowed it from my MS SQL days
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    3. COYour intention is not clear. Do you want to update an "animal", changing one of its attributes to (point to)a new value? Also: actual table definitions would help.
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