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Functions
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Function
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DEGREES(numeric_expression)
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Description
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Converts the given angle in radians into degrees. Returns the exponential value of a given numeric expression. Returns the largest integer less than or equal to the given numeric expression. Returns the natural logarithm for the given numeric expression using the base-2 system. Returns the base-10 logarithm. Returns the constant value of PI (3.14159265358979). Returns the value of the given numeric expression to the specified power (p). Converts degrees to radians. Calculates a random floating-point number between 0 and 1. Returns a numeric expression rounded to the specified length or precision. Returns the positive, zero, or negative sign of the given expression.
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EXP(numeric_expression)
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FLOOR(numeric_expression)
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LOG(numeric_expression)
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LOG10(numeric_expression)
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PI()
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POWER(numeric_expression, p)
RADIANS(numeric_expression)
RAND(seed)
ROUND(numeric_expression, length, [function])
SIGN(numeric_expression)
SQL Server 2000 Stored Procedure Programming
Function
SIN(numeric_expression)
Description
Returns the sine of the specified angle (angle is in radians). Returns the square of the given expression. Returns the square root of the given expression. Returns the trigonometric tangent of the given angle (angle is in radians)
SQUARE(numeric_expression)
SQRT(numeric_expression)
TAN(numeric_expression)
Metadata Functions
These functions are like a drill that you can use to obtain information about a database and database objects.
Function
COL_LENGTH(table, column)
Description
Returns the length of the column. Returns the name of the column specified by Table Identification Number and Column Identification Number. Returns information about a column or stored procedure parameter. Returns the value of the named database property for a given database and property name.
COL_NAME(table_id, column_id)
COLUMNPROPERTY(id, column, property)
DATABASEPROPERTY(database, property)
5:
Functions
Function
DATABASEPROPERTYEX(database, property)
Description
Returns the value of the named database property for a given database and property name. The returned value is of the sql_variant datatype. This function is available only in SQL Server 2000. Returns the database identification number for the given database. Returns the database name for a given database identification number. Returns the identification number for a logical filename in the current database. Returns the logical filename for the given file identification number. Returns the identification number for the given filegroup name. Returns the filegroup name for the given filegroup identification number.
DB_ID(database)
DB_NAME(database_id)
FILE_ID(file_name)
FILE_NAME(file_id)
FILEGROUP_ID(filegroup_name)
FILEGROUP_NAME(filegroup_id)
SQL Server 2000 Stored Procedure Programming
Function
FILEGROUPPROPERTY(filegroup_name, property)
Description
Returns the filegroup property value for the given filegroup name and property name. Returns the value of the given property for the given filename. Returns information about full-text catalog properties. Returns information about a full-text service property. Returns the indexed column name. Returns the value of the given property for a given table identification number and index name. Returns the identification number of the given object. Returns the database object name for the given object identification number. Returns information about the specified property for a given object s identification number.
FILEPROPERTY(file_name, property)
FULLTEXTCATALOGPROPERTY (catalog_name, property)
FULLTEXTSERVICEPROPERTY (property)
INDEX_COL(table, index_id, key_id)
INDEXPROPERTY (table_id, index, property)
OBJECT_ID(object)
OBJECT_NAME(object_id)
OBJECTPROPERTY(ID, property)
5:
Functions
Function
@@@PROCID
Description
Returns the identification number of the current stored procedure. Returns information about the datatype.
TYPEPROPERTY(type, property)
Security Functions
SQL Server 7.0 has introduced many improvements in the area of security. The most important of these is the introduction of the role concept. Roles in SQL Server correspond to roles in MS Transaction Server and groups in Windows NT. In earlier versions of SQL Server, users could belong to only one group. This restriction led to problems when a developer wanted to implement more complex security rules. The result was often a security hierarchy of groups, where each higher group could perform all activities that lower groups could perform. Unfortunately, this model does not always correspond to the requirements of a particular business environment. Some implementations involved a considerable number of groups, all of which had to be managed. In SQL Server 2000 and SQL Server 7.0, one user can be associated with many roles. Thus, you can assign a set of permissions to a role and then assign each user a set of required roles. Security functions return information about users, roles, and their assignments:
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