qr code generator c# Lesson 1: Working with Tables and Data Types in C#

Print QR Code ISO/IEC18004 in C# Lesson 1: Working with Tables and Data Types

Lesson 1: Working with Tables and Data Types
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which will be covered in detail in 5, Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views.
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Creating a Table
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Before you can create a table, you need a schema in which to create the table .A schema is similar to a namespace in many other programming languages; however, there can be only one level of schemas (that is, schemas cannot reside in other schemas). There are already several schemas that exist in a newly created database: the dbo, sys, and information_schema schemas. The dbo schema is the default schema for new objects, while the sys and information_schema schemas are used by different system objects.. Before SQL Server 2005, schemas did not exist. Instead of the object residing in a schema the object was owned by a database user (however, the syntax was the same: <owner>.<object>) In these versions, dbo was recommended to own all objects, but this is not true anymore. Starting with SQL Server 2005, all objects should be created within a user-defined schema. Schemas are created using the CREATE SCHEMA statement, as shown in the following example of creating a schema and a table within that schema:
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CREATE SCHEMA Sales; GO
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CREATE TABLE Sales.Customers ( CustomerId INT NOT NULL ,Name NVARCHAR(50) NOT NULL );
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Tables are created either using the CREATE TABLE or the SELECT . . . INTO statement (the SELECT . . . INTO statement creates a new table based on a query). The basic syntax of the CREATE TABLE statement is shown here:
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CREATE TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name ( { <column_definition> | <computed_column_definition> | <column_set_definition> } [ <table_constraint> ] [ ,...n ] ) [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] [ { TEXTIMAGE_ON { filegroup | "default" } ] [ WITH ( <table_option> [ ,...n ] ) ] [ ; ]
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Before we go into the specifics of the syntax, we will look at the rules that apply when naming tables and columns.
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Tables, Data Types, and Declarative Data Integrity
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Table and Column Names (Identifiers)
Both table and column names are identifiers, and they must adhere to certain rules. Identifiers are either standard or delimited. The requirements of each of these are described next.
STANDARD IDENTIFIERS
Here are the requirements for standard identifiers:
The first character must be a letter or an underscore (_), not a digit.
note
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The first character can also be an at sign (@) or a number sign (#), but both of these have special meanings, as follows:
@ defines a variable or parameter.
note
@@ doesn t mean anything other than @, and it should not be used because many system functions begin with @@.
# defines a temporary object (that is, the object is available only from the current connection). ## defines a global temporary object (that is, the object is available from any connection in the same instance).
Subsequent characters can include letters, digits, the at sign (@), the dollar sign ($), the number sign (#), and the underscore (_). The identifier must not be a T-SQL reserved word. Embedded spaces or special characters are not allowed.
DELIMITED IDENTIFIERS
Any identifier that does not adhere to the standard identifier naming rules must be delimited using either quotation marks ( ) or square brackets ([]). Using quotation marks conforms to the ANSI SQL standard; however, you must be aware that the SET QUOTED_IDENTIFIER session setting must be set to ON for the quotation marks to be used for delimited identifiers. (Square brackets can always be used for delimited identifiers.) The default setting for SET QUOTED_IDENTIFIER is ON, but older T-SQL code may require it to be set to OFF. Setting QUOTED_IDENTIFIER to OFF causes SQL Server to interpret the quotation marks as strings instead of identifiers.
Lesson 1: Working with Tables and Data Types
The following are examples of identifiers:
-- Standard identifiers CREATE TABLE HR.Employees ( EmployeeId INT NOT NULL );
-- Delimited identifiers: SET QUOTED_IDENTIFIER ON;
CREATE TABLE HR."Organisation Employees" ( "Employee Id" INT NOT NULL ); -- or CREATE TABLE HR.[Organisation Employees] ( [Employee Id] INT NOT NULL );
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