c# gtin Computed Columns in Visual C#.NET

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Computed Columns
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A special type of column that you can create is a computed column that contains a computation involving one or more other columns in the table. Computed columns contain a definition for the computation but do not physically store data by default. When the data is returned, the computation is applied to return a result. You can force computed columns to physically store data by using the Persisted key word. This process causes SQL Server to make the computation when the row is
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Designing the Physical Database
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inserted or modified, and the result of the computation is physically stored in the table. If you have a high frequency of queries that require the computed column, you should create it as Persisted so you do not have to incur the computation overhead when the computation is retrieved.
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Now that all the properties related to columns that are used to define the structure of a table have been discussed, you are ready to actually create a table. You can cre ate three different types of tables in SQL Server: permanent, temporary, and table variables.
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Permanent Tables
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To create a table, you use the CREATE TABLE command. The general form of this com mand is as follows:
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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
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| "default" } ]
[ { TEXTIMAGE_ON { filegroup | "default" } ]
[ ; ]
To execute this command, you must be a member of the sysadmin fixed server role, the database owner fixed database role, an owner of a schema, or have been granted the CREATE TABLE permission. A table created with this command causes a table to be created in the database that can be accessed by any user with the appropriate per missions.
Object Creation
One of the first mistakes that many people make is similar to omitting the nullability from t he column def inition. A t able is refer red to by database.schema.tablename. You can generally omit the name of the database from a CREATE TABLE script because you normally execute the statement after chang ing context to the appropriate database. However, you should always include the name of the schema in the creation script to ensure that the table is always cre ated with the proper naming scheme and owned by the correct schema.
Lesson 1: Designing Database Tables
For example, a database administrator (DBA) is logged in as user2 with the authority of a database owner. user2 executes the following statement:
CREATE TABLE MyTable (ID int Column1 varchar(30) NOT NULL, NULL)
The DBA then gets a call that users are getting errors within an application, say ing that a table does not exist. The reason that users cannot find the table is because the application was coded to look for dbo.MyTable. However, because the name of the schema was omitted from the CREATE TABLE statement, the table was actually created in the user2 schema and is called user2.MyTable. Many commands have optional parameters. You need to be very rigorous when executing scripts to ensure that you specify all options instead of relying on the default behaviors in SQL Server to fill in all the optional parameters. The ON clause specifies where the table resides on physical storage. If you do not specify a filegroup, the table is created on the primary filegroup. Using the previous example, the customer address table can be created as follows:
CREATE TABLE dbo.CustomerAddress
(AddressLine1 varchar(30) AddressLine2 varchar(30) AddressLine3 varchar(30) City varchar(50) StateProvinceID int PostalCode char(10) CountryID int NOT NULL,
NULL,
NULL,
NOT NULL,
NULL,
NULL,
NULL)
The table definition specified previously dictates the following:
The table will be owned by the dbo schema. A minimum of 1 address line must be specified for every customer who has a maximum of 30 characters. The storage space consumed will be equal to the number of characters in the column. 1 or 2 optional address lines can be specified with up to 30 characters each, with the storage space being consumed equal to the number of characters in the column. A customer must have a city specified that can be up to 50 characters in length and will consume storage equal to the number of characters in the column.
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