Hello,
DB-structure:
=========
firmendaten
-----------------
firmendatenid <-
firmennummer
name
strasse
hausnr
platzierungen
-----------------
platzierungenid
platzierungswor t
platzierungsfol ge
firmendatenid <-
Questions:
==========
1.) I would like to find the records from the table 'positioning' that
are not joined with 'companydata'. I did this as following, is that
correct?
SELECT a.platzierungen id, a.platzierungsw ort, a.firmendatenid ,
b.firmendatenid
FROM platzierungen a
LEFT JOIN firmendaten b ON b.firmendatenid = a.firmendatenid
WHERE b.firmendatenid IS NULL
2.) Now I want to delete just these found records, in the table
'platzierungen' that don't have a equivalent record in the table
'firmendaten', since the company does not existent anymore.
MySQL 4.0.20:
-----------------
DELETE FROM platzierungen LEFT JOIN firmendaten ON
firmendaten.fir mendatenid = platzierungen.f irmendatenid WHERE
firmendaten.fir mendatenid IS NULL
MySQL error output:
#1064 - You have an error in your SQL syntax. Check the manual that
corresponds to your MySQL server version for the right syntax to use
near 'LEFT JOIN firmendaten ON firmendaten.fir mendatenid = platzieru
=> What am I doing wrong? How do I transfer above SELECT statement to
a DELETE Statement?
Thanks for your help! 2 1776
R. Tarazi wrote: Hello,
DB-structure: ========= firmendaten ----------------- firmendatenid <- firmennummer name strasse hausnr
platzierungen ----------------- platzierungenid platzierungswor t platzierungsfol ge firmendatenid <-
Questions: ========== 1.) I would like to find the records from the table 'positioning' that are not joined with 'companydata'. I did this as following, is that correct?
SELECT a.platzierungen id, a.platzierungsw ort, a.firmendatenid , b.firmendatenid FROM platzierungen a LEFT JOIN firmendaten b ON b.firmendatenid = a.firmendatenid WHERE b.firmendatenid IS NULL
2.) Now I want to delete just these found records, in the table 'platzierungen' that don't have a equivalent record in the table 'firmendaten', since the company does not existent anymore.
MySQL 4.0.20: -----------------
DELETE FROM platzierungen LEFT JOIN firmendaten ON firmendaten.fir mendatenid = platzierungen.f irmendatenid WHERE firmendaten.fir mendatenid IS NULL
MySQL error output:
#1064 - You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'LEFT JOIN firmendaten ON firmendaten.fir mendatenid = platzieru
=> What am I doing wrong? How do I transfer above SELECT statement to a DELETE Statement?
Thanks for your help!
This article should help you: http://www.electrictoolbox.com/artic...-table-delete/
--
Chris Hope - The Electric Toolbox - http://www.electrictoolbox.com/
> SELECT a.platzierungen id, a.platzierungsw ort, a.firmendatenid , b.firmendatenid FROM platzierungen a LEFT JOIN firmendaten b ON b.firmendatenid = a.firmendatenid WHERE b.firmendatenid IS NULL
DELETE FROM platzierungen LEFT JOIN firmendaten ON firmendaten.fir mendatenid = platzierungen.f irmendatenid WHERE firmendaten.fir mendatenid IS NULL
what about this:
Delete From platzierungen
SELECT a.platzierungen id, a.platzierungsw ort, a.firmendatenid ,
b.firmendatenid
FROM platzierungen a
LEFT JOIN firmendaten b ON b.firmendatenid = a.firmendatenid
WHERE b.firmendatenid IS NULL
HP This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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Hello,
DB-structure:
=========
firmendaten
-----------------
firmendatenid <-
firmennummer
name
strasse
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