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POSQL select join: is it possible to prefix all columns as 'prefix.*'?
 

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  1. POSQL select join: is it possible to prefix all columns as 'prefix.*'?
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    <p>I'm wondering if this is possible in SQL. Say you have two tables A and B, and you do a select on table A and join on table B:</p> <pre><code>SELECT a.*, b.* FROM TABLE_A a JOIN TABLE_B b USING (some_id); </code></pre> <p>If table A has columns 'a_id', 'name', and 'some_id', and table B has 'b_id', 'name', and 'some_id', the query will return columns 'a_id', 'name', 'some_id', 'b_id', 'name', 'some_id'. Is there any way to prefix the column names of table B without listing every column individually? The equivalent of this:</p> <pre><code>SELECT a.*, b.b_id as 'b.b_id', b.name as 'b.name', b.some_id as 'b.some_id' FROM TABLE_A a JOIN TABLE_B b USING (some_id); </code></pre> <p>But, as mentioned, without listing every column, so something like:</p> <pre><code>SELECT a.*, b.* as 'b.*' FROM TABLE_A a JOIN TABLE_B b USING (some_id); </code></pre> <p>Basically something to say, "prefix every column returned by b.* with 'something'". Is this possible or am I out of luck?</p> <p>Thanks in advance for your help!</p> <p>EDIT: advice on not using SELECT * and so on is valid advice but not relevant in my context, so please stick to the problem at hand -- is it possible to add a prefix (a constant specified in the SQL query) to all the column names of a table in a join?</p> <p>EDIT: my ultimate goal is to be able to do a SELECT * on two tables with a join, and be able to tell, from the names of the columns I get in my result set, which columns came from table A and which columns came from table B. Again, I don't want to have to list columns individually, I need to be able to do a SELECT *.</p>
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    1. COWhat exactly do you expect the outcome of your query to be? I'm confused
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    2. COGregD: I want all the column names that come out of b.* to be prefixed with some constant that I specify. For example, instead of 'name' and 'number', I want to specify, say, the 'special_' prefix and get 'special_name' and 'special_number'. But I don't want to do this for each column individually.
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    3. COWhen I do a quick SELECT to see columns from multiple tables I sometime do SELECT 'AAAAA', A.*, 'BBBBB', B.* FROM TableA AS A JOIN TableB AS B ON A.ID = B.ID so that I at least have a table identifier when scanning along the rows
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