Clausola TOP n

Francesco Giossi — Wed, 23 Apr 2008 21:48:24 GMT

SQL Server:

SELECT TOP 10 product, descr, email
FROM products

ORACLE:

SELECT product, descr, email
FROM products
WHERE ROWNUM <= 10

MySQL:

SELECT product, descr, email
FROM products
LIMIT 10

How to format a value using T-SQL: pad left

Francesco Giossi — Thu, 15 Nov 2007 09:55:10 GMT

SQL server has no built-in format functions. Here is a user defined function which left-pad a varchar value with a variable length string.

CREATE FUNCTION [dbo].[PadString]

(@Seq varchar(16),
@PadWith char(1),
@PadLength int
)

RETURNS varchar(16) AS

BEGIN

declare @curSeq varchar(16)

SELECT @curSeq = ISNULL(REPLICATE(@PadWith, @PadLength - len(ISNULL(@Seq ,0))), '') + @Seq

RETURN @curSeq

END

Testing the function:

SELECT dbo.PadString ('8', '0', 5)

SELECT dbo.PadString ('abc', '*', 12)

SELECT dbo.PadString ('abc', '0', 7)

Here are the results:

----------------
00008

(1 row(s) affected)

----------------
*********abc

(1 row(s) affected)

----------------
0000abc

(1 row(s) affected)

---------------------------------------------------------

TAGS: sql server format string pad left