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mysql insert into existing row

By : Sameer Bhagyawant
Date : May 05 2020, 08:16 AM
I trying to add the suffixes to the older (existing) value(s) in the table.

Hence I would have this result:

enter image description here

And if I need to insert dude again, the trigger will check if it exists, then append the next available (-3 in this case) to the existing one, and insert the newest dude WITHOUT a suffix:

enter image description here

Is this possible to do that ?

Thanks in advance.

Answer :

A trigger in MySQL can't act on mysql table which caused it to fire, hence your plan will not work, at least not as you described it. What you are asking for is going to be very difficult, if not impossible, to do, and would probably end up being a maintenance nightmare. I actually don't see any point to labelling the slug values with versions. I can offer a workaround, namely just building the version suffix at the time you query. This is fairly painless, and frees you from having a draconian table design. Something like this:

SET @rank = 0;
SET @slug = NULL;

         THEN CONCAT(t1.slug, '-', CAST(t1.label AS CHAR(50)))
         ELSE t1.slug END AS slug
        @rank:=CASE WHEN @slug = slug THEN @rank + 1 ELSE 1 END AS label,
        @slug:=slug AS slug
    FROM yourTable
    ORDER BY slug, id
) t1
    SELECT slug, MAX(id) AS id
    FROM yourTable
    GROUP BY slug
) t2
    ON t1.id   = t2.id AND
       t1.slug = t2.slug;


enter image description here

Demo here:


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