SQL Server - Deleting rows between a date range using SQL. Date conversion fails

You wrote 31st of February... Maybe..... that date doesn't exists.

DELETE FROM BIZ 
WHERE [Orgnl_Cmpltn_Date]
BETWEEN '2014-02-28'  AND '2014-04-01'

For a general idea of convert date:

DELETE FROM BIZ 
WHERE [Orgnl_Cmpltn_Date]
BETWEEN CONVERT(date,'2014.02.28',102) and CONVERT(date,'2014.04.01',102)

Here you can find the complete list of values for third parameter of CONVERT https://msdn.microsoft.com/en-us/library/ms187928.aspx

Use this instead

DELETE FROM BIZ
WHERE [Orgnl_Cmpltn_Date] >= '2014-02-28'
AND [Orgnl_Cmpltn_Date] <= '2014'04'01'

I don't know if this matters, but February has only 28 or 29 days.

I assume you use SQL Server, try this..

    DELETE FROM BIZ 
    WHERE CONVERT(DATE,[Orgnl_Cmpltn_Date])
    BETWEEN CONVERT(DATE,'2014-02-28') AND CONVERT(DATE,'2014-04-01')

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