What is XML data type in SQL?
The xml data type is a built-in data type in SQL Server and is somewhat similar to other built-in types such as int and varchar. As with other built-in types, you can use the xml data type as a column type when you create a table as a variable type, a parameter type, a function-return type, or in CAST and CONVERT.
What is XML format in SQL Server?
SQL Server provides an XML schema that defines syntax for writing XML format files to use for bulk importing data into a SQL Server table. XML format files must adhere to this schema, which is defined in the XML Schema Definition Language (XSDL).
Why is XML used in SQL?
XML (eXtensible Markup Language) is one of the most common formats used to share information between different platforms. Owing to its simplicity and readability, it has become the de-facto standard for data sharing. In addition, XML is easily extendable.
What is PRIMARY KEY SQL?
The PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).
How do I get a value from XML in SQL Server?
Applies to: SQL Server (all supported versions) Azure SQL Database Performs an XQuery against the XML and returns a value of SQL type. This method returns a scalar value. You typically use this method to extract a value from an XML instance stored in an xml type column, parameter, or variable.
How do I change the default value of a column in SQL?
Using SQL Server Management Studio. To specify a default value for a column. In Object Explorer, right-click the table with columns for which you want to change the scale and click Design. Select the column for which you want to specify a default value.
How do I extract a value from an XML file?
Performs an XQuery against the XML and returns a value of SQL type. This method returns a scalar value. You typically use this method to extract a value from an XML instance stored in an xml type column, parameter, or variable. In this way, you can specify SELECT queries that combine or compare XML data with data in non-XML columns.
How do I get the XML value from an int variable?
Using the value () method against an xml type variable. In the following example, an XML instance is stored in a variable of xml type. The value () method retrieves the ProductID attribute value from the XML. The value is then assigned to an int variable. SQL.