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

Antonios Chatzipavlis

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 is a Data Solutions Consultant and Trainer. He has been working in IT since 1988. In his career, he has worked as senior developer, IT Manager, Solutions Architect and IT Consultant. Since 1995 he has been devoted on new technologies and software development tools, mainly by Microsoft, either by training company staff and colleagues or assisting them in design, development and implementation as a consultant or chief developer. He has focused in Databases and Data Science since 1995. He specialized in Microsoft SQL Server since version 6.0 in areas like SQL Server Internals, Database Design and Development, Business Intelligence and in 2010 he has started working with Azure Data Platform, NoSQL databases, Big Data Technologies and Machine Learning. He is an active member of many IT communities in Greece, answering colleagues' questions and writing articles in his web site. He is the owner of SQLschool.gr which is a community portal with a lot of information about Microsoft SQL Server. He has been a Microsoft Certified Trainer (MCT) since 2000. Microsoft honored him as MVP on Data Platform due to his activities in SQL Server since 2010. He holds a large number of Microsoft Certifications and Microsoft SQL Server Certifications since version 6.5.


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