比较 Sql 中的日期

Question

I am having trouble trying to compare dates in my sql query:

SELECT restrictions, restrictions_adddate FROM restrictions WHERE id = '555555'
AND restrictions_adddate BETWEEN ? and ?;

Both of the parameters system print in the format 'mm-dd-yyyy'. I am getting a wrong date format error, but have tried doing it in multiple ways. Any help is appreciated, and if more info is needed, please let me know. thanks.

Answer 1

This should work on any standard compliant DBMS:

SELECT restrictions, restrictions_adddate 
FROM restrictions 
WHERE id = '555555'
  AND restrictions_adddate BETWEEN DATE '2011-01-01' and DATE '2011-12-31';

Answer 2

Try checking out the CONVERT function T-SQL reference in BOL. You should be able to use this dictate the format of your dates.

Answer 3

This is my preference:

AND restrictions_adddate BETWEEN
    CONVERT(datetime, FLOOR(CONVERT(float, CAST('01-01-1900' AS DATETIME))))
    AND CONVERT(datetime, FLOOR(CONVERT(float, Getdate())));

This allows you to compare dates (minus the time stamps).