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Analytic functions calculate an aggregate value based on a group of rows. Unlike aggregate functions, however, analytic functions can return multiple rows for each group. Use analytic functions to compute moving averages, running totals, percentages or top-N results within a group.
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[!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] returns an error message when converting nonnumeric **char**, **nchar**, **nvarchar**, or **varchar** data to **decimal**, **float**, **int**, **numeric**. [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] also returns an error when an empty string (" ") is converted to **numeric** or **decimal**.
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## Certain datetime conversions are nondeterministic
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The following table lists the styles for which the string-to-datetime conversion is nondeterministic.
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The styles for which the string-to-datetime conversion is nondeterministic are as follows:
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|All styles below 100<sup>1</sup>|106|
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|107|109|
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|113|130|
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- All styles below 100<sup>1</sup>
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<sup>1</sup> With the exception of styles 20 and 21
All configuration functions operate in a nondeterministic way. In other words, these functions do not always return the same results every time they are called, even with the same set of input values. See [Deterministic and Nondeterministic Functions](../../relational-databases/user-defined-functions/deterministic-and-nondeterministic-functions.md) for more information about function determinism.
All cursor functions are nondeterministic. In other words, these functions do not always return the same results each time they execute, even with the same set of input values. See [Deterministic and Nondeterministic Functions](../../relational-databases/user-defined-functions/deterministic-and-nondeterministic-functions.md) for more information about function determinism.
ISNUMERIC returns 1 when the input expression evaluates to a valid numeric data type; otherwise it returns 0. Valid [numeric data types](../../t-sql/data-types/numeric-types.md) include the following:
> ISNUMERIC returns 1 for some characters that are not numbers, such as plus (+), minus (-), and valid currency symbols such as the dollar sign ($). For a complete list of currency symbols, see [money and smallmoney (Transact-SQL)](../../t-sql/data-types/money-and-smallmoney-transact-sql.md).
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> ISNUMERIC returns 1 for some characters that are not numbers, such as plus (+), minus (-), and valid currency symbols such as the dollar sign ($). For a complete list of currency symbols, see [money and smallmoney (Transact-SQL)](../../t-sql/data-types/money-and-smallmoney-transact-sql.md).
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## Examples
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The following example uses `ISNUMERIC` to return all the postal codes that are not numeric values.
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```
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```sql
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USE AdventureWorks2012;
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GO
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SELECT City, PostalCode
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## Examples: [!INCLUDE[ssSDWfull](../../includes/sssdwfull-md.md)] and [!INCLUDE[ssPDW](../../includes/sspdw-md.md)]
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The following example uses `ISNUMERIC` to return all the postal codes that are not numeric values.
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```
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```sql
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USE master;
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GO
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SELECT name, isnumeric(name) AS IsNameANumber, database_id, isnumeric(database_id) AS IsIdANumber
> Arithmetic functions, such as ABS, CEILING, DEGREES, FLOOR, POWER, RADIANS, and SIGN, return a value having the same data type as the input value. Trigonometric and other functions, including EXP, LOG, LOG10, SQUARE, and SQRT, cast their input values to **float** and return a **float** value.
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All mathematical functions, except for RAND, are deterministic functions. This means they return the same results each time they are called with a specific set of input values. RAND is deterministic only when a seed parameter is specified. For more information about function determinism, see [Deterministic and Nondeterministic Functions](../../relational-databases/user-defined-functions/deterministic-and-nondeterministic-functions.md).
> Arithmetic functions, such as ABS, CEILING, DEGREES, FLOOR, POWER, RADIANS, and SIGN, return a value having the same data type as the input value. Trigonometric and other functions, including EXP, LOG, LOG10, SQUARE, and SQRT, cast their input values to **float** and return a **float** value.
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All mathematical functions, except for RAND, are deterministic functions. This means they return the same results each time they are called with a specific set of input values. RAND is deterministic only when a seed parameter is specified. For more information about function determinism, see [Deterministic and Nondeterministic Functions](../../relational-databases/user-defined-functions/deterministic-and-nondeterministic-functions.md).
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