SQlite Query select string date today or less than

Question

Im having problem in query i cannot get the proper result dates i want I need to get all the date from today or less than date today

can you help me or give me right query to use

for example this is mytable

id(number) datestring(string)
1          02/06/2019
2          02/06/2019 
3          02/14/2019
4          02/04/2019
5          03/17/2019

query i use: SELECT * FROM mytable WHERE datestring <= date('now')

expected result is id(number) datestring(string) 1 02/06/2019 2 02/06/2019 4 02/04/2019

Thank you for helping

Answer 1

The issue you are encountering is that date('now') will return 2019-02-06 , as such as all rows in the table start with 0 and that this is less than 2.

You either need to convert on of the dates to be in the same format as the other or use the same format when storing the data.

SQLite itself has various date format that can be recognised and used and it is advisable to utilise one of these as reduces necessary complexity.

Time Strings A time string can be in any of the following formats:

 YYYY-MM-DD YYYY-MM-DD HH:MM YYYY-MM-DD HH:MM:SS YYYY-MM-DD HH:MM:SS.SSS YYYY-MM-DDTHH:MM YYYY-MM-DDTHH:MM:SS YYYY-MM-DDTHH:MM:SS.SSS HH:MM HH:MM:SS HH:MM:SS.SSS now DDDDDDDDDD 

SQL As Understood By SQLite - Date And Time Functions

The following is a solution that could be used to convert the datestring column within the query :-

SELECT * FROM mytable WHERE substr(datestring,7,4)||'-'||substr(datestring,1,2)||'-'||substr(datestring,4,2) <= date('now');

The following could be used to convert the existing data to a recognised format :-

UPDATE mytable SET datestring = substr(datestring,7,4)||'-'||substr(datestring,1,2)||'-'||substr(datestring,4,2);

This could be followed by your original query

SELECT * FROM mytable WHERE datestring <= date('now');