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Asked: 2026-05-26T22:27:21+00:00

i need to perform an operation (in this case DATEDIFF()) on 2 dates. But

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i need to perform an operation (in this case DATEDIFF()) on 2 dates. But at least one of those dates is incomplete.

For example: DATEDIF(‘2010-01-00′,’2010-02-01’) OR DATEDIF(‘2010-01-00′,’2010-02-00’) will return NULL

Indeed, in http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_datediff, the manual, it says DATEDIF can’t handle incomplete dates, as all the date arithmetic functions.

As i can’t,don’t want to change my database and i really need to do this operation, do you know a way to do it, a trick?

I ask in general even if my actual issue is to perform this DATEDIF.

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1 Answer

  1. Editorial Team

    You can use IF and CONCAT to check for incomplete dates and replace 00 with 01.

    IF ( isnull(CONCAT(v6.title,v7.title,v8.title)), IF ( isnull(CONCAT(v7.title,v8.title)), v8.title, 
        CONCAT(v7.title,\'.\',v8.title) ),
        CONCAT(v6.title,\'.\',v7.title,\'.\',v8.title) ) AS "Datum",
        IF ( isnull(CONCAT(v9.title,v10.title)) & isnull(CONCAT(v11.title, v12.title)), v13.title, 
                   IF ( isnull(CONCAT(v9.title,v10.title)) & isnull(v13.title), CONCAT(v11.title,\'-\', v12.title),
                    IF ( isnull(CONCAT(v11.title,v12.title)) & isnull(v13.title), CONCAT(v9.title,\':\', v10.title, \' Uhr\'),
                    "Hello World" ) ) ) AS "Uhrzeit",
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