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Add/Remove Leading/Trailing Zero with T-SQL and SSIS

Antonios Chatzipavlis
Friday 18 July 2014

Στο περιβάλλον εργασίας μου υπάρχουν αρκετές διαδικασίες που ανταλλάσσουν  δεδομένα μεταξύ ετερογενών συστημάτων. Κάποια από αυτά είναι legacy και ενώ έχει γίνει μια φανταστική δουλειά να μιλάνε τα συστήματα αυτά μέσω services, εντούτοις υπάρχουν κάποιες μικρές ιδιαιτερότητες. Μια από αυτές είναι με τα νούμερα που τα legacy θέλουν συγκεκριμένο πλήθος ψηφίων με leading zero και φυσικά δίνουν τα αποτελέσματα με αυτό το format.

Επειδή όμως αυτό είναι κάτι που αρκετοί το κάνουν με διάφορους τρόπους μέσα από τον κώδικα της εφαρμογής τους θέλω με αυτό το post να δείξω πως γίνεται με απλό T-SQL αλλά να πάμε και ένα βήμα παραπάνω καθώς υπάρχουν και αρκετοί που χρησιμοποιούν Integration Services για να κάνουν ETL διαδικασίες.

T-SQL

-- ADD LEADING OR TRAILING ZERO 
-- THE RESULT IS STRING 

DECLARE @NUM DECIMAL(15,2) = 1234.56;
SELECT  RIGHT(N'000000000000000'+CAST(@NUM AS NVARCHAR(15)),15) AS LEADING_ZERO
       ,LEFT(CAST(@NUM AS NVARCHAR(15))+N'000000000000000',15) AS TRAILING_ZERO;
GO


-- REMOVE LEADING OR TRAILING ZERO
-- THE RESULT IS STRING
DECLARE @LNUM NVARCHAR(15) = '000000001234.56';
DECLARE @TNUM NVARCHAR(15) = '1234.5600000000';
SELECT  SUBSTRING(@LNUM,PATINDEX('%[^0]%',@LNUM),15) AS NO_LEADING_ZERO
         ,REVERSE(SUBSTRING(REVERSE(@TNUM),PATINDEX('%[^0]%',REVERSE(@TNUM)),15)) AS NO_TRAILING_ZERO
         -- CHECK FOR NOT A DECIMAL NUMBER (SQL SERVER 2000, 2005, 2008, 2008 R2 VERSION)
         ,CASE WHEN CHARINDEX('.',@TNUM) = 0 THEN @TNUM
          ELSE REVERSE(SUBSTRING(REVERSE(@TNUM),PATINDEX('%[^0]%',REVERSE(@TNUM)),15)) END AS NO_TRAILING_ZERO_2
         -- CHECK FOR NOT A DECIMAL NUMBER (SQL SERVER 2012, 2014 VERSION)
         ,IIF (CHARINDEX('.',@TNUM) = 0,@TNUM,REVERSE(SUBSTRING(REVERSE(@TNUM),PATINDEX('%[^0]%',REVERSE(@TNUM)),15))) AS NO_TRAILING_ZERO_3

SSIS

Με τη χρήση ενός Derived Column task το expression για να γίνει εισαγωγή leading & trailing zero είναι

RIGHT("000000000000000" + ((DT_WSTR,15)(DT_DECIMAL,2)[ColumnName]),15) -- Leading

LEFT(((DT_WSTR,15)(DT_DECIMAL,2)[ColumnName]) + "000000000000000",15) -- Trailing

, ενώ για να αφαιρεθούν είναι

(DT_WSTR,50)(DT_DECIMAL,2)[ColumnName] -- Leading

REVERSE((DT_WSTR,50)REVERSE((DT_WSTR,50)(DT_DECIMAL,2)[ColumnName])) -- Trailing


/*antonch*/


Antonios Chatzipavlis

Antonios Chatzipavlis

Antonios Chatzipavlis is a highly experienced Data Solutions Consultant and Trainer. He has been working in the IT industry since 1988, holding various roles such as senior developer, IT Manager, Data & AI Solutions Architect and Consultant.

Since 1995, Antonios has focused on modern technologies and software development tools, primarily by Microsoft. He has specialized in Data & AI since 2000, with expertise in Microsoft Data Platform (SQL Server, Azure SQL Databases, Azure Synapse Analytics, Microsoft Fabric, Power BI, AI) and Databricks.

Antonios is also a Microsoft Certified Trainer (MCT) for over 25 years, has been recognized as a Microsoft Most Valuable Professional (MVP) in Data Platform since 2010 and he is in the Data Expert 40 Powerlist 2024 by Boussias. He is the co-founder and visionary behind XLYTiCA, a company dedicated to Data & AI solutions.

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