unique index

Columns of a unique index are allowed to be NULL, while columns in a unique constraint are not.

In a multi-partition database partition group, you can only create a unique index if it is a superset of the partitioning key.

If the query references at least one table without a unique index, the keyset cursor is converted to a static cursor.

Is a constraint that provides entity integrity for a specified column or columns through a unique index.

For compatible SQL, stay within the Adaptive Server Anywhere restriction of unique index names for a given table owner.

Query references at least one table without a unique index.

In other words, all columns that are part of the partitioning key must be present in the primary key or unique index definition.

Is a constraint that enforces entity integrity for a specified column through a unique index.

A unique index , UNIQUE constraint, or PRIMARY KEY constraint cannot be created if duplicate key values exist in the data .

Duplicate values must be removed before a unique index can be created on the column or columns.

Duplicates must be eliminated before a unique index can be created on the columns.

A unique index is one in which no two rows are permitted to have the same index key value.

When a primary key constraint is defined, the federated system automatically creates a unique index specification.

Creating a unique index guarantees that any attempt to duplicate key values fails.

The primary key and any unique index of the table must be a superset of the associated partitioning key.

There are no significant differences between creating a UNIQUE constraint and creating a unique index independent of a constraint.

This set of columns may be generated from a base table primary key, a unique constraint or a unique index.

Is a constraint that provides entity integrity for a specified column or columns by using a unique index.

Is a constraint that enforces entity integrity for a specified column or columns by using a unique index.

Always select the smallest unique index available for your full-text unique key.

When a UNIQUE index is created on a column in Oracle 10g, it ensures that the NOT NULL values entered in that column are unique.

CGTTs do not support unique constraints or primary keys, but you can create a unique index.

All of the tables in the main data connection must contain a primary key, unique constraint, or unique index.

Specifying a unique index makes sense only when uniqueness is a characteristic of the data itself.

A unique index or constraint cannot be created if there are existing duplicate values in the key columns.

There is a difference between a unique constraint on a table and a unique index.

Lists the tables and views that have a unique index defined on them, but are not already a part of the full-text catalog.

When one field has a unique index and the other does not, Access creates a one-to-many relationship.

Each element of an array is identified by a unique index number.

Equating a column to a value: estimate one row when the column has a unique index or is the primary key.

A unique index can be created only on columns that are defined as NOT NULL.

Creating a PRIMARY KEY or UNIQUE constraint automatically creates a unique index on the specified columns.

A unique index ensures that the index key contains no duplicate values and therefore every row in the table or view is in some way unique.

Creates a unique index on a table. A unique index means that two rows cannot have the same index value.

When you create a PRIMARY KEY constraint, a unique index on the column, or columns, is automatically created.

ID of the corresponding unique index in the parent object that was created to enforce this constraint.

You cannot create a unique index on a single column if that column contains NULL in more than one row.

Tables must have the same primary key, unique index, or unique constraint.

A warning message is issued, and only the rows that violate the UNIQUE index fail.

A warning message is issued and only the rows violating the UNIQUE index fail.

Table as well, we can skip this field, since ECO itself will add unique index fields to identify class instances.

The common field from the primary table must be a primary key or have a unique index.

SharePoint sites use one unique index field for its ID column in a list.

Make sure that you use the right keys in the WHERE clause, which should preferrably be either the primary key or a unique index.

A unique index prevents two rows in the indexed table from having the same values in the index columns.

Column ID of the unique index identified by FULLTEXT_KEY_NAME.

Specifies the index options for the PRIMARY KEY or UNIQUE index.

When you create or modify a unique index or constraint, you can set the IGNORE_DUP_KEY option ON or OFF.

There are no significant differences between creating a UNIQUE constraint and creating a unique index that is independent of a constraint.

You tried to enter a duplicate value in a field that is a primary key or that has a unique index .

ID of the column associated with the single-column unique index that is participating in the full-text index definition.

After this synchronization, a unique index is added to C2 on the subscription database.

The "name" column will be a CHAR(30), set to NOT NULL, and have a unique index on it.

Other unique index fields or sets of fields are not moved.

Creates a unique index on a table or view.

There are several index options that can be specified when you create a unique index.

The following example creates a unique index on the MyCustomers table.

If a published table does not have a uniqueidentifier column with the ROWGUIDCOL property and a unique index, replication adds one.

Also, before setting up replication in DB2, you will want to ensure that every database table has a primary key or unique index.

All local tables in the query must have a unique index.

The table has a unique index, indx_parent_col1.

When a unique index exists, the Database Engine checks for duplicate values each time data is added by a insert operations.

The Database Engine automatically creates a unique index to enforce the uniqueness requirement of the PRIMARY KEY constraint.

The Database Engine automatically creates a UNIQUE index to enforce the uniqueness requirement of the UNIQUE constraint.

Uniqueness in the CCD table must be enforced -- either by a primary key or unique index on the source table or CCD table

Any column in the base table can be specified, except when partitioning a UNIQUE index,

Cannot Script Full-Text Indexes for Tables with No Primary Keys Even if Another Unique Index Exists

Incorrect Identity Values After Failed Unique Index Creation