SQL Server 2005 - Format a decimal number with leading zeros (including signed decimals!)

Question

I need to format numbers like:-

1.99
21.34
1797.94
-300.36
-21.99
-2.31

Into a format mask of 0000.00, using SQL-Server 2005 T-SQL. Preserving the signed integers and the decimals after the dot. This would be used for text file exports for a financial system. It requires it to be in this format.

e.g.-

0001.99
0021.34
1794.94
-0300.36
-0021.99
-0002.31

Previously, it was done in MS Access as Format([Total],"0000.00") but SQL-Server doesn't have this function.

Answer 1

;WITH t(c) AS
(
SELECT 1.99 UNION ALL 
SELECT 21.34  UNION ALL 
SELECT 1797.94  UNION ALL 
SELECT -300.36  UNION ALL 
SELECT -21.99  UNION ALL 
SELECT -2.31 
)
SELECT  
     CASE WHEN SIGN(c) = 1 THEN '' 
          ELSE '-' 
     END + REPLACE(STR(ABS(c), 7, 2), ' ','0') 
FROM t

Returns

0001.99
0021.34
1797.94
-0300.36
-0021.99
-0002.31