Übersetzung für "Unique constraint" in Deutsch

How do I create a unique constraint that also allows nulls?

Setting unique Constraint with fluent API?

As with the Primary Key, the Unique constraint can be multi-column.

The UNIQUE constraint defines the requirement of content uniqueness for the values in a key throughout the table.

In this tab, identity constraints are listed by the kind of identity constraint (unique, key, keyref) and displayed as an expandable/collapsible tree.

The name of the primary or unique key constraint linked by the REFERENCES clause in the constraint definition

That makes it possible to define a UNIQUE constraint on a column that does not have the NOT NULL constraint.

I need a composite unique constraint for my entity's Name property, which is unique per Category (for which it has an FK).

When a primary key, foreign key or unique constraint is added to a table or column, an index with the same name is created automatically, without an explicit directive from the designer.

Since Firebird 1.5, in compliance with the SQL-99 standard, NULLs – even multiple – are now allowed in columns with a UNIQUE constraint.

The data type of a column that is involved in a foreign key, primary key or unique constraint cannot be changed at all.

In the ER Model, a unique key constraint implies that each entity instance has a minimum set of attributes whose values are distinct.

When dropping fields, it is important to note that the field may not be part of the table's primary key, have a foreign key relationship with another table, contain a unique constraint, be part of a table constraint or part of another column's CHECK constraint.

But me, though-- my life has left me uniquely unfit for constraint.

A table can contain any number of unique key constraints.

Define the uniqueness constraint on the results element in a similar way to that described above.

This adds a row for the uniqueness constraint (see screenshot below).

Indexes are created automatically in the process of defining constraints, such as primary key, foreign key or unique constraints.

It had all of the same needs as a community on earth would have, but it had some very unique constraints.

In this view, IDCs can be edited either in the Identity Constraints tab (screenshot above) or in an element's Constraints box in the diagram (screenshot below, in which the match element has a uniqueness constraint that has a team selector).