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Lesson 1: Designing Database Tables
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A default causes a value to be entered into a column when one is not speci fied by a user. A unique constraint ensures that duplicate values do not exist in a column or combination of columns. A primary key ensures that each row in a table can be uniquely identified by the column or combination of columns specified. Only one primary key can exist on a table, whereas multiple unique constraints can be created. A foreign key forces a column to allow only values that exist in the table that is referenced.
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Transact-SQL user-defined types (UDTs) are used as an aliasing mechanism to pro vide consistency in table definitions within a database. For example, you might have customers, vendors, manufacturers, and employees stored in the same database. Because of differences in the data you store for each, you might have separate address tables for each one. Even though you have four different address tables, a city column exists in each one. The city column is variable-length character data with a maximum size of 30 characters. You can implement this as a varchar(30) in each table or you can use a Transact-SQL UDT to ensure that all city columns are defined the same. To create a UDT, you use the CREATE TYPE command as follows:
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CREATE TYPE [ schema_name. ] type_name {
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FROM base_type
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[ ( precision [ , scale ] ) ]
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[ NULL | NOT NULL ]
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| EXTERNAL NAME assembly_name [ .class_name ] } [ ; ]
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The following creates a UDT for the preceding city column:
CREATE TYPE udt_city
FROM varchar(30) NOT NULL ;
You can then use this UDT when a table is defined, as follows:
CREATE TABLE dbo.CustomerAddress
(CustomerAddressID int IDENTITY(1,1) PRIMARY KEY CLUSTERED,
12
Designing the Physical Database
AddressTypeID tinyint dbo.AddressType(AddressTypeID), PrimaryAddressFlag bit AddressLine1 varchar(30) AddressLine2 varchar(30) AddressLine3 varchar(30) City udt_city StateProvinceID int dbo.StateProvince(StateProvinceID), PostalCode char(10) CountryID int dbo.Country(CountryID));
NOT NULL FOREIGN KEY (AddressTypeID) REFERENCES NOT NULL, NOT NULL, NULL, NULL, NOT NULL, NULL FOREIGN KEY (StateProvinceID) REFERENCES NULL, NULL FOREIGN KEY (CountryID) REFERENCES
Transact-SQL UDTs are always created by using base data types.
Common Language Runtime (CLR) UDTs
You can use the CLR integration in SQL Server to create data types that do not already exist within SQL Server. You must enable the CLR within the SQL Server Surface Area Configuration utility to use a CLR UDT. If the CLR is ever disabled, all columns defined with CLR UDTs will no longer be accessible. To create a CLR UDT, you must create a class by using one of the .NET programming languages, such as C#, that conforms to the UDT specification. The class then has to be compiled to a dll. A member of the sysadmin fixed server role must register the assembly in the SQL Server instance. Only then can you implement a CLR UDT within a database.
Quick Check
What are the two classes of UDTs and what is the purpose of each Transact-SQL UDTs provide a way to standardize a data type definition based on a native SQL Server data type that can then be used within tables to ensure consistency within a database. CLR UDTs are used to introduce new data types that do not exist within SQL Server, such as geospatial coordinates.
Quick Check Answer
Lesson 1: Designing Database Tables
Creating a Partitioned Table, Index, or Indexed View
Creating a partitioned table or index uses the same syntax as creating a regular table or index. Partitioning an indexed view is simply a matter of partitioning the index for the view. The general syntax for each command is as follows:
CREATE TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name ( { <column_definition> | <computed_column_definition> } [ <table_constraint> ] [ ,...n ] ) [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] [ { TEXTIMAGE_ON { filegroup | "default" } ] [ ; ] CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON <object> ( column [ ASC | DESC ] [ ,...n ] )
[ INCLUDE ( column_name [ ,...n ] ) ]
[ WITH ( <relational_index_option> [ ,...n ] ) ]
[ ON { partition_scheme_name ( column_name )
| filegroup_name | default } ][ ; ]
The important clause of each statement is the ON clause. To partition a table or index, instead of specifying a filegroup, you specify a partition scheme. To understand this, following is a code sample:
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