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All main topics / Informatik / SQL

SQL (26 Cards)

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Was bedeutet der folgende Ausdruck:
ON DELETE SET NULL / ON UPDATE SET NULL
Wenn in der Master-Tabelle ein Wert gelöscht/verändert wird, werden die Referenzen in der Detail-Tabelle auf NULL gesetzt
Tags: Datenbank, detail-tabelle, master-tabelle, NULL, ON DELETE SET NULL, ON UPDATE SET NULL, referenz, sql
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Flashcard set info:
Author: Stejan
Main topic: Informatik
Topic: SQL
School / Univ.: ZbW
City: St. Gallen
Published: 04.03.2011
Tags: sql database datenbank
 
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All cards (26)
ALL (1)
AUTO_INCREMENT (1)
bedingung (1)
befehl (1)
case sensitive (1)
CHAR (1)
column (1)
Constraint (1)
constraints (1)
create (3)
CREATE (2)
data dictionary (2)
database (1)
datenbank (2)
Datenbank (24)
datenbasis (2)
datentyp (1)
dbms (1)
dbs (1)
ddl (3)
definition (2)
DELETE (1)
DESC (1)
detail-tabelle (2)
DISTINCT (1)
dml (2)
dql (2)
FOREIGN KEY (1)
FROM (1)
INSERT (2)
join (1)
kartesisches produkt (1)
like (1)
master-tabelle (2)
mysql (1)
NULL (1)
ON DELETE CASCADE (1)
ON DELETE SET NULL (1)
ON UPDATE CASCADE (1)
ON UPDATE SET NULL (1)
ORDER BY (1)
Primärschlüssel (1)
PRIMARY KEY (3)
referenz (1)
relationen algebra (1)
schema (1)
SELECT (3)
selektion (1)
spalte (1)
sql (18)
SQL (3)
statement (1)
tabelle (1)
table (4)
TABLE (1)
union (2)
UNION (1)
UPDATE (1)
VARCHAR (1)
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