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Convert a Number to Time

Antonios Chatzipavlis
Thursday 21 May 2020

Η προγραμματιστική λογική είναι εξαιρετική αρκεί να ακολουθεί το χρυσό κανόνα της απλότητας.


Όσοι με γνωρίζουν από το παρελθόν ξέρουν καλά ότι ήμουν είμαι και θα είμαι προγραμματιστής που απλά βαρέθηκε να γράφει φόρμες και αποφάσισε να ασχοληθεί με τα δεδομένα.

Τόσα χρόνια ακούω ότι η T-SQL έχει περιορισμένες δυνατότητες.

Ίσως να είναι αλήθεια αλλά είναι;

Common approach

Βλέποντας κάποιου τον κώδικα είδα ότι για να μετατρέψει ένα αριθμό σε ώρα με format HH:MM:SS:MI εκτελούσε το παρακάτω και μάλιστα το είχε βάλει σε UDF για το καλεί στα queries του.

SQL Script

declare @t int = 1234567.89;

        RIGHT('0' + CAST(@t/(1000*60*60) AS VARCHAR(2)),2), ':',                     -- Hrs
        RIGHT('0' + CAST((@t%(1000*60*60))/(1000*60) AS VARCHAR(2)),2), ':',         -- Mins
        RIGHT('0' + CAST(((@t%(1000*60*60))%(1000*60))/1000 AS VARCHAR(2)),2), '.',  -- Secs
        ((@t%(1000*60*60))%(1000*60))%1000                                           -- Milli Secs
) AS [hh:mm:ss.ms]

Simple approach

Αντί για αυτό μπορούμε απλά να κάνουμε τα παρακάτω

SQL Script

declare @t int = 1234567.89;
select 'Milliseconds to Time' as conversion, convert(time(2),dateadd(MILLISECOND,@t,0),14) as 'HH:MM:SS:MI';
select 'Seconds to Time' as conversion, convert(time(2),dateadd(SECOND,@t,0),14) as 'HH:MM:SS:MI';
select 'Minutes to Time' as conversion, convert(time(2),dateadd(MINUTE,@t,0),14) as 'HH:MM:SS:MI';
Conversion Results
conversion HH:MM:SS:MI
Milliseconds to Time 00:20:34.57
Minutes to Time 08:07:00
Seconds to Time 06:56:07

Δεν είναι απλούστερο; και δεν είναι string!

//Antonios Chatzipavlis


21 May 2020 @ 10:26 PM


Nick Stavrou

Αυτή η σειρά με τα άρθρα σας είναι εξαιρετική.

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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