# Microsoft SQL Server 2005

Version of implementation Microsoft SQL Server of programming language SQLMicrosoft SQL Server 2005 (codenamed Yukon) is the next after SQL Server 2000 version of Microsoft SQL Server. It features native support for XML processing, error handling and support for recursive queries, as well as numerous minor enhancements.

## Examples:

### Hello, World! - SQL (15):

```
select 'Hello, World!';
```

### Fibonacci numbers - SQL (17):

This example uses a kind of iterative definition of Fibonacci numbers, implemented with a recursive query. Each row of recursive query contains two consecutive numbers of the sequence, and next row is calculated as (last number, sum of numbers) of previous row. This way most numbers are stored twice, so only first number of each row is included in the result.

```
with fibonacci(a, b) as
(
select 1, 1
union all
select b, a+b from fibonacci where b < 1000
)
SELECT cast(a as varchar)+', ' AS [text()]
FROM fibonacci
FOR XML PATH ('')
```

### Factorial - SQL (16):

This example uses recursive factorial definition, implemented as a recursive query — a feature included in SQL Server 2005 and higher. Each row of recursive query contains two numeric fields — n and f = n!, and each row is calculated using the data of the previous row.

Note that starting with 2008 version you can calculate factorials only up to 12!. Trying to calculate 13! results in “Data truncation” error, i.e. the resulting value is too large for its datatype.

```
with factorial(n, f) as
(
select 0, 1
union all
select n+1, f*(n+1) from factorial where n<16
)
select cast(n as varchar)+'! = '+cast(f as varchar)
from factorial
```

### Quadratic equation - SQL (497):

SELECT dbo.quadratic_equation(1,2,1)

SELECT dbo.quadratic_equation(1,2,3)

```
CREATE FUNCTION quadratic_equation (@a FLOAT
,@b FLOAT
,@c float )
RETURNS varchar (100)
AS
BEGIN
DECLARE @ret varchar(100);
declare @delta float ;
declare @denom float ;
select @delta=(POWER(@b,2)-4*@a*@c);
select @denom=(2*@a);
if (@delta>=0)
BEGIN
DECLARE @x12 FLOAT;
SELECT @x12=((-@b+SQRT(@delta))/@denom);
SELECT @ret='x1='+ CONVERT(varchar(100),@x12 )
+' x2='+ CONVERT(varchar(100),@x12 )
END
ELSE
BEGIN
DECLARE @nat FLOAT;
DECLARE @imm FLOAT;
SELECT @nat=((-@b)/@denom);
SELECT @imm=((SQRT(-@delta))/@denom);
SELECT @ret='x1='+ CONVERT(varchar(100),@nat)+'+i'+CONVERT(varchar(100),@imm )
+' x2='+ CONVERT(varchar(100),@nat)+'-i'+CONVERT(varchar(100),@imm )
end
RETURN @ret ;
END;
```

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