Hack Strategien für binäre Optionen

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Diese sind wichtige Datenbankobjekte. These are important database objects. This topic contains the following sections. Verwandte Aufgaben Related Tasks. A table typically has a column or combination of columns that contain values that uniquely identify each row in the table.

This column, or columns, is called the primary key PK of the table and enforces the entity integrity of automatische binare aktionen table. Because primary key constraints guarantee unique data, they are frequently defined on an identity column. When you specify a primary key constraint for a table, the Datenbankmodul Database Engine enforces data uniqueness by automatically creating a unique index for the primary key columns. This index also permits fast access to data when the primary key is used in queries.

If a primary key constraint is defined on more than one automatische binare aktionen, values may be duplicated within one column, but each combination of values from all the columns in the primary key constraint definition must be unique.

ProductVendor table form a composite primary key constraint for this table. This prevents the insertion of duplicate rows. A table can contain only one primary key constraint. A primary key cannot exceed 16 columns and a total key length of bytes. The index generated by a primary key constraint cannot cause the number of indexes on the table to exceed nonclustered indexes and 1 clustered index.

If automatische binare aktionen or nonclustered is not specified for a primary key constraint, clustered is used if there no clustered index on the table. All columns defined within a primary key constraint must be automatische binare aktionen as not null.

If nullability is not specified, all columns participating in a primary key constraint have their nullability set to not null. If a primary key is defined on a CLR user-defined type column, the implementation of the type must support binary ordering.

A foreign key FK is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table. In a foreign key reference, a link is created between two tables when the column or columns that hold the primary key value for one table are referenced by the column or columns in another table. This column becomes a foreign key in the second table. Nehmen Sie beispielsweise an, die Sales.

For example, the Sales. SalesOrderHeader table has a foreign key link to the Sales. SalesPerson table because there is a logical relationship between sales orders and salespeople. By creating this foreign key relationship, a value for SalesPersonID cannot be inserted into the SalesOrderHeader automatische binare aktionen if it does not already exist in the SalesPerson table.

A table can reference a maximum of automatische binare aktionen tables and columns as foreign keys outgoing references. SQL Server Requires at least compatibility level.

The increase has the following restrictions: A table with a foreign key reference to itself is still limited to foreign key references. Greater than foreign key references are not currently available for columnstore indexes, memory-optimized tables, Stretch Database, or partitioned foreign key tables. Unlike primary key constraints, creating a foreign key constraint does not automatically create a corresponding index. However, manually creating an index on a foreign key is often useful for the following reasons: Foreign key columns are frequently used in join criteria when the data from related tables is combined in queries by matching the column or columns in the foreign key constraint of one table with the primary or unique key column or columns in the other table.

An index enables the Datenbankmodul Database Engine to quickly find automatische binare aktionen data in the foreign key table. Es ist jedoch nicht zwingend erforderlich, einen Index zu erstellen. However, creating this index is not required. Data from two related tables can be combined even if no primary automatische binare aktionen or foreign key constraints are defined between the tables, but a foreign key relationship between two tables indicates that the two tables have been optimized to be combined in a query that uses the keys as its criteria.

Changes to primary key constraints are checked with foreign key constraints in related tables. Although the automatische binare aktionen purpose of a foreign key constraint is to control the data that can be stored in the foreign key table, it also controls changes to data in the primary key table. For example, if the row for a salesperson is deleted from the Sales.

SalesPerson table, and the salesperson's ID is used for sales orders in the Sales. SalesOrderHeader table, the relational integrity between the two tables is broken; the deleted salesperson's sales automatische binare aktionen are orphaned in the SalesOrderHeader table without a link to the data in the SalesPerson table.

A foreign key constraint prevents this situation. The constraint enforces referential integrity by guaranteeing that changes cannot automatische binare aktionen made to data automatische binare aktionen the primary key table if those changes invalidate the link to data in the foreign key table. If an attempt is made to delete the row in a primary key table or to change a primary key value, the action will fail when the deleted or changed primary key value corresponds to a value in the foreign key constraint of another table.

To successfully change or delete a row in a foreign key constraint, you automatische binare aktionen first either delete the foreign key data in the foreign key table or change the foreign key data in the foreign key table, which links the foreign automatische binare aktionen to different primary key data.

By using cascading referential integrity constraints, you can define the actions that the Datenbankmodul Database Engine takes when a user tries to delete or update a key to which existing foreign keys point. The following cascading actions can be defined.

The Datenbankmodul Database Engine raises an error and the delete or update action on the row in the parent table is rolled back. Corresponding rows are updated or deleted in the referencing table when that row is updated or deleted in the parent table. All the values that make up the foreign key are set to NULL when the corresponding row in the parent table is updated or deleted. For this constraint to execute, the foreign key columns must be nullable.

All the values that make up the foreign automatische binare aktionen are set to their default values if the corresponding row in the parent table is updated or deleted. For this constraint to execute, all foreign key columns must have default definitions. If a column is nullable, and there is no explicit default value set, NULL becomes the implicit default value of the column.

If there are any AFTER triggers defined on the affected tables, these triggers fire after all cascading actions are performed.

These triggers fire in opposite order of the cascading action. If there are multiple triggers on a single table, they fire in random order, unless there is a dedicated first or last trigger for the table. However, one chain always fires all its triggers automatische binare aktionen another chain starts firing. In diesem Fall sind keine weiteren Tabellen von der Kaskadierung betroffen. There are no other tables affected by cascading automatische binare aktionen this case.

The following table lists the common tasks associated with primary key and foreign key constraints. Describes how to create a primary key. Describes how to delete a primary key. Describes how to modify a primary key. Describes how to modify foreign key relationships. Describes how to delete foreign key relationships. Describes how to view foreign key properties. Describes how to disable foreign key constraints for replication.

Describes how to create foreign key automatische binare aktionen.

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