Query comparing dates in SQL
SqlSql ServerDateCompareSql Problem Overview
I have a table with dates that all happened in the month November. I wrote this query
select id,numbers_from,created_date,amount_numbers,SMS_text
from Test_Table
where
created_date <= '2013-04-12'
This query should return everything that happened in month 11 (November) because it happened before the date '2013-04-12' (in December)
But it's only returning available dates that happened in days lesser than 04 (2013-04-12)
Could it be that it's only comparing the day part? and not the whole date?
How to fix this?
Created_date is of type date
Date format is by default yyyy-dd-MM
Sql Solutions
Solution 1 - Sql
Instead of '2013-04-12' whose meaning depends on the local culture, use '20130412' which is recognized as the culture invariant format.
If you want to compare with December 4th, you should write '20131204'. If you want to compare with April 12th, you should write '20130412'.
The article Write International Transact-SQL Statements from SQL Server's documentation explains how to write statements that are culture invariant:
> Applications that use other APIs, or Transact-SQL scripts, stored procedures, and triggers, should use the unseparated numeric strings. For example, yyyymmdd as 19980924.
EDIT
Since you are using ADO, the best option is to parameterize the query and pass the date value as a date parameter. This way you avoid the format issue entirely and gain the performance benefits of parameterized queries as well.
UPDATE
To use the the the ISO 8601 format in a literal, all elements must be specified. To quote from the ISO 8601 section of datetime's documentation
>To use the ISO 8601 format, you must specify each element in the format. This also includes the T, the colons (:), and the period (.) that are shown in the format. > > ... the fraction of second component is optional. The time component is specified in the 24-hour format.
Solution 2 - Sql
Try like this
select id,numbers_from,created_date,amount_numbers,SMS_text
from Test_Table
where
created_date <= '2013-12-04'
Solution 3 - Sql
If You are comparing only with the date vale, then converting it to date (not datetime) will work
select id,numbers_from,created_date,amount_numbers,SMS_text
from Test_Table
where
created_date <= convert(date,'2013-04-12',102)
This conversion is also applicable during using GetDate() function
Solution 4 - Sql
please try with below query
select id,numbers_from,created_date,amount_numbers,SMS_text
from Test_Table
where
convert(datetime, convert(varchar(10), created_date, 102)) <= convert(datetime,'2013-04-12')
Solution 5 - Sql
You put <=
and it will catch the given date too. You can replace it with <
only.
Solution 6 - Sql
Date format is yyyy-mm-dd. So the above query is looking for records older than 12Apr2013
Suggest you do a quick check by setting the date string to '2013-04-30', if no sql error, date format is confirmed to yyyy-mm-dd.
Solution 7 - Sql
Try to use "#" before and after of the date and be sure of your system date format. maybe "YYYYMMDD O YYYY-MM-DD O MM-DD-YYYY O USING '/ O ' "
Ex:
select id,numbers_from,created_date,amount_numbers,SMS_text
from Test_Table
where
created_date <= #2013-04-12#
Solution 8 - Sql
Convert them to dates in the same format and then you can compare. Τry like this:
where convert(date, created_date,102) <= convert(date, /*102 is ANSI format*/
substring('2013-04-12',1,4) + '.' + /*year*/
substring('2013-04-12',9,2) + '.' + /*month*/
substring('2013-04-12',6,2) /*day*/
,102)
Solution 9 - Sql
you can also use to_char(column_name, 'YYYY-MM-DD) to change format
Solution 10 - Sql
Below query can be used to find the records of month November for the year 2013.
Select id,numbers_from,created_date,amount_numbers,SMS_text
from Test_Table
where Month(created_date) = 11 and Year(created_date) = 2013