Question 113414 in Mysql Question posted in
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Mysql – SELECT tabA.*, tabB.* FROM … => Duplicate Column

I’ve got following tables:

Supplier
idSupplier
Name
Product
idProduct
idSupplier
EAN

Now I want to select all values from both tables. I’m using this Query:

SELECT
    Supplier.*,
    Product.*
FROM
    Supplier
        INNER JOIN
    Product
        ON Supplier.idSupplier = Product.idSupplier

The issue is, that MySQL/MariaDB complains about a duplicate column name. I know, that you can eliminate the issue by listing all field separately and define a alias for the field Product.idSupplier or just by excluding it.

But since I’m lazy and will probably forget, that this has to be expanded if I ever update or expand a table, I want a ‘automatic’ solution. This means, every newly added field should automatically be included in the result.

There are probably some MySQL magicians who can solve this.

Tags:

2

Answers


  1. 0

    It’s always better to explicitly specify the columns you want.

    But in this particular case, you can join using USING instead of ON and doing a SELECT * instead of tablename.* to only get one copy of the column:

    SELECT *
FROM
    Supplier
        INNER JOIN
    Product
        USING(idSupplier)
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  2. 0

    MySQL doesn’t complain about duplicate column names unless you wrap the query you show as a subquery.

    If you can’t give up your habit of using SELECT *, then you can solve it by making sure to define distinct column names in each table.

    Boom! Problem solved. 🖐️🎤

    But there’s a problem in your original conditions:

    I’m lazy and will probably forget

    Any solution we suggest can be circumvented by at least one of these.

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