更新语句返回受影响的0行

Question

I am having issues with an update statement where I need to change the employeeid field from 4 to 6 for orders that have an order date of 7-19-1996

the statement i made is saying 0 rows affected when i know for a fact there are several rows that fit this description. Can someone steer me in the right direction as far as why am i getting this result and what I did wrong? Thanks here is the statement I have so far

UPDATE [dbo].[LMOrders]
SET [EmployeeID] = 6
WHERE OrderDate= 7-19-1996

Answer 1

The OrderDate here is wrong in any database. If I assume a OrderDate as a String, you can always do WHERE OrderDate= '7/19/1996'

If you need a conversion to date, since with [dbo]. I assume you're with mssql, check https://msdn.microsoft.com/fr-CA/library/ms187928.aspx for conversion.

Answer 2

If OrderDate is DateTime then you need to format your WHERE cause correctly: '2007-05-08 12:35:29.123' or if Date then '2007-05-08'

Here is a great resource, at the bottom of the doc shows the different formats https://msdn.microsoft.com/en-us/library/ms187819.aspx