Question

I want to delete all these results, from this query based on reserveringsnr.

(SELECT DISTINCT res.reserveringsnr, datum, begintijd, eindtijd, aantalpersonen, klantnr, betaald, tafr.tafelnr, menr.reserveringsnr, menr.menunr, menr.uniqueid FROM reserveringen as res
    INNER JOIN menus_regel as menr
    ON res.reserveringsnr = menr.reserveringsnr
    INNER JOIN tafels_regel AS tafr
    ON res.reserveringsnr = tafr.reserveringsnr
    WHERE res.reserveringsnr = '21')

But something like this doesnt seem to work

DELETE FROM 
(SELECT DISTINCT res.reserveringsnr, datum, begintijd, eindtijd, aantalpersonen, klantnr, betaald, tafr.tafelnr, menr.reserveringsnr, menr.menunr, menr.uniqueid FROM reserveringen as res
    INNER JOIN menus_regel as menr
    ON res.reserveringsnr = menr.reserveringsnr
    INNER JOIN tafels_regel AS tafr
    ON res.reserveringsnr = tafr.reserveringsnr
    WHERE res.reserveringsnr = '21')Delete
WHERE Delete.reserveringsnr = '21'

Anyone could push me a bit in the right direction?
Thanks in advance!

Answer 1

the query below will delete all records on table reserveringen only.

DELETE  res
FROM    reserveringen as res
        INNER JOIN menus_regel as menr
            ON res.reserveringsnr = menr.reserveringsnr
        INNER JOIN tafels_regel AS tafr
            ON res.reserveringsnr = tafr.reserveringsnr
WHERE   res.reserveringsnr = '21'

but if you want to delete records from all tables where reserveringsnr matched up, then you need to specify all table names in DELETE clause

DELETE  res, menr, tafr
FROM    reserveringen as res
        INNER JOIN menus_regel as menr
            ON res.reserveringsnr = menr.reserveringsnr
        INNER JOIN tafels_regel AS tafr
            ON res.reserveringsnr = tafr.reserveringsnr
WHERE   res.reserveringsnr = '21'