How to Delete MSSQL Table Datetime GETDATE() Columns if they are One Year Old or Older Using PHP

问题

My column is named order_date and the data for it is:

datetime NOT NULL DEFAULT GETDATE(),

This will make data appear as:

Apr 8 2014 3:24PM

I am wondering what PHP Query I can use to delete any rows in this MSSQL table if they are one year old or older.

I would also like a way to test if this works. (IE: Modifying a current row's order_date column to make it a year older.)

If anyone can help me with this it is greatly appreciated. T

回答1:

delete from tracking_orders where DATEDIFF (year, order_date, GETDATE()) > 1

Check here:

http://technet.microsoft.com/en-us/library/ms189794.aspx

回答2:

DELETE FROM TABLE_NAME 
WHERE order_date < DATEADD(YEAR, -1, GETDATE())

This query can make use of indexes defined on order_date column if any.

来源：https://stackoverflow.com/questions/22948535/how-to-delete-mssql-table-datetime-getdate-columns-if-they-are-one-year-old-or