SQL SERVER Get Numeric Value From Alpha Numeric String

SQL SERVER – Get Numeric Value From Alpha Numeric String – UDF for Get Numeric Numbers Only and it was very handy tool for me. This post has provided Stored Procedure and the same can be easily converted to Function.

CREATE PROCEDURE [dbo].[CleanDataFromAlphaNumeriString]
@alpha VARCHAR(50),
@decimal DECIMAL(14, 5) OUTPUT
AS BEGIN
SET NOCOUNT ON;
DECLARE @ErrorMsg VARCHAR(50)
DECLARE @Pos INT
DECLARE @CommaPos INT
DECLARE @ZeroExists INT
DECLARE @alphaReverse VARCHAR(50)
DECLARE @NumPos INT
DECLARE @Len INT
-- 1 Reverse the alpha in order to get the last position of a numeric value
SET @alphaReverse = REVERSE(@alpha)
-- 2 Get the last position of a numeric figure
SET @NumPos = PATINDEX('%[0-9]%', @alphaReverse)
-- 3 Get the lenght of the string
SET @Len = LEN(@alpha)
-- 4 Add a comma after the numeric data in case it's no decimal number
SET @alpha = SUBSTRING(@alpha, 1, (@Len - @NumPos + 1))
+ ','
+ SUBSTRING(@alpha, (@Len - @NumPos + 2), 50)
-- Check if there is a zero (0) in the @alpha, then we later set the @decimal to 0
-- if it's 0 after the handling, else we set @decimal to NULL
-- If 0 no match, else there is a match
SET @ZeroExists = CHARINDEX ( '0' , @alpha ,1 )
-- Find position of , (comma)
SET @CommaPos = 1
SET @CommaPos = PATINDEX('%,%', @alpha)
IF (@CommaPos = '') BEGIN
SET @CommaPos = 20
END
SET @Pos = PATINDEX('%[^0-9]%',@alpha)
-- Replaces any aplha with '0' since we otherwice can't keep track of where the decimal
-- should be put in. We assume the numeric number has no aplhe inside. The regular way
-- to solve this is to replace with ”, but then we miss the way to find the place to
-- put in the decimal.
WHILE (@Pos > 0) BEGIN
SET @alpha = STUFF(@alpha, @pos, 1, '0')
SET @Pos = PATINDEX('%[^0-9]%',@alpha)
END
IF (@alpha IS NOT NULL AND @alpha != '') BEGIN
SET @decimal = CONVERT(DECIMAL(14, 5), SUBSTRING(@alpha, 1, (@CommaPos - 1))
+ '.'
+ SUBSTRING(@alpha, (@CommaPos + 1), 20))
END
-- Since we in this case don't want to set 0 if where is no numeric value, we set NULL to be safe
IF (@decimal = 0 AND @ZeroExists = 0) BEGIN
SET @decimal = NULL
END
END
GO

If you run above SP as shown below it will work
DECLARE @myRetVal DECIMAL(14,5)
EXEC [CleanDataFromAlphaNumeriString] 'ABC355,88ghf', @myRetVal OUTPUT
SELECT @myRetVal ReturnValue

ReturnValue
---------------------------------------
355.88000

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SQL Server Identify missing indexes

In this post you will see how to identify missing indexes

SELECT DISTINCT DB_NAME(Database_ID) [Database]
,OBJECT_NAME(Object_ID) [Table]
,Equality_Columns
,Included_Columns
FROM sys.dm_db_missing_index_details mid
WHERE Database_ID = DB_ID()
ORDER BY 2

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SQL Server Get foreign keys of a table

In this post you will learn how to get foriegn keys of a table in SQl Server

Here T-SQl for fetching foriegn keys of a table.


SELECT f.name AS ForeignKey
,OBJECT_NAME(f.parent_object_id) AS TableName
,COL_NAME(fc.parent_object_id
,fc.parent_column_id) AS ColumnName
,OBJECT_NAME (f.referenced_object_id) AS ReferenceTableName
,COL_NAME(fc.referenced_object_id
,fc.referenced_column_id) AS ReferenceColumnName
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
ON f.OBJECT_ID = fc.constraint_object_id
WHERE OBJECT_NAME (f.referenced_object_id) = 'TableName'
ORDER BY 2

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