Oracle Database
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Showing posts with the label ConstraintsShow all
SQL NOT NULL Constraint NOT NULL Une colonne accepte standard défaut une valeur NULL. Pour rejeter une valeur NULL dans une colonne, vous devez définir une contrainte sur cette colonne en indiquant que celle-ci n'acceptent…
SQL CREATE INDEX SQL CREATE INDEX INDEX is used to create and retrieve data from the database very quickly. A list can be created using one or a group of columns in a table. When the index is created, it is assigned a ROW…
SQL CHECK Constraint A verification or check constraint is a type of integrity constraint in SQL that specifies a requirement that must be met standard each line in a database table. Coercion must be a predicate. It can refer …
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