SQL Date from a string

Posted on 2016-09-12
Last Modified: 2016-09-13
Hello EE, I have a column field in a table called "Instruction Text"

inside, users are puting text and a date such as :

Date job for November 18 BlaBlaBla

I know its not the right way to do things, dont worry, but until this get fix, I need a way to be able to search this field and do a where clause with BETWEEN Dates to search and get results.

for example WHERE (do stuffhere) >= date1    

I know we could do a LIKE and get date as a string but I need the user to be able to search either FROM DATE  OR  TO DATE

in other words, the user could enter only a from date and not a TO Date (so we cannot use Between)
or vice versa....

can you help me?

i know what you are going to say, if text is like this " OCTOBER20"  without space it will not work, well thats the user problem. they have a shitty system its not our problem.
Question by:PhilippeRenaud
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LVL 40

Expert Comment

ID: 41795089
Sorry to say things are a bit confusing as you say "I need a way to be able to search this field and do a where clause with BETWEEN Dates to search and get results." but then in brackets - " (so we cannot use Between)'" - so are you allowed to use between or not?

And what about the Year? as from "OCTOBER 20" to "November 18" could be a lot of data for many years if the system was operational for long time that is not even sure you want it deleted right?
LVL 69

Accepted Solution

Scott Pletcher earned 500 total points
ID: 41795112
I've used CROSS APPLYs to simplify the SELECT columns.  I assume you're looking for current date forward, but that part can be added/adjusted later if the part below works OK for you:

    [instruction Text],
    CASE WHEN month_b_start < month_a_start
        THEN SUBSTRING([instruction Text], month_b_start, month_b_len + 3)
        ELSE SUBSTRING([instruction Text], month_a_start, month_a_len + 3)
        END AS start_date,
    CASE WHEN month_b_start < month_a_start
        THEN SUBSTRING([instruction Text], month_a_start, month_a_len + 3)
        ELSE SUBSTRING([instruction Text], month_b_start, month_b_len + 3)
        END AS end_date        
    VALUES('DATE JOB FOR OCTOBER 20 BlaBlaBla'),('Date job for November 18 BlaBlaBla'),
          ('DATE JOB FOR December 1 thru January 23')
) AS test_data([instruction Text])
         70000 + NULLIF(CHARINDEX('January', [instruction Text]), 0),
         80000 + NULLIF(CHARINDEX('February', [instruction Text]), 0),
         50000 + NULLIF(CHARINDEX('March', [instruction Text]), 0),
         50000 + NULLIF(CHARINDEX('April', [instruction Text]), 0),
         30000 + NULLIF(CHARINDEX('May', [instruction Text]), 0),
         40000 + NULLIF(CHARINDEX('June', [instruction Text]), 0),
         40000 + NULLIF(CHARINDEX('July', [instruction Text]), 0),
         60000 + NULLIF(CHARINDEX('August', [instruction Text]), 0),
         90000 + NULLIF(CHARINDEX('September', [instruction Text]), 0),
         70000 + NULLIF(CHARINDEX('October', [instruction Text]), 0),
         80000 + NULLIF(CHARINDEX('November', [instruction Text]), 0),
         80000 + NULLIF(CHARINDEX('December', [instruction Text]), 0)
        ) AS month_len_and_start_a
) AS ca1
    SELECT STUFF([instruction Text], month_len_and_start_a % 10000, 3, '') AS instruction_text2
) AS ca2
         70000 + NULLIF(CHARINDEX('January', instruction_text2), 0),
         80000 + NULLIF(CHARINDEX('February', instruction_text2), 0),
         50000 + NULLIF(CHARINDEX('March', instruction_text2), 0),
         50000 + NULLIF(CHARINDEX('April', instruction_text2), 0),
         30000 + NULLIF(CHARINDEX('May', instruction_text2), 0),
         40000 + NULLIF(CHARINDEX('June', instruction_text2), 0),
         40000 + NULLIF(CHARINDEX('July', instruction_text2), 0),
         60000 + NULLIF(CHARINDEX('August', instruction_text2), 0),
         90000 + NULLIF(CHARINDEX('September', instruction_text2), 0),
         70000 + NULLIF(CHARINDEX('October', instruction_text2), 0),
         80000 + NULLIF(CHARINDEX('November', instruction_text2), 0),
         80000 + NULLIF(CHARINDEX('December', instruction_text2), 0)
        ) AS month_len_and_start_b
) AS ca3
    SELECT month_len_and_start_a / 10000 AS month_a_len,
        month_len_and_start_a % 10000 AS month_a_start,
        month_len_and_start_b / 10000 AS month_b_len,
        month_len_and_start_b % 10000 AS month_b_start
) AS ca4

Author Comment

ID: 41795114
Icohan, sorry,

i can use between, its just that user wont be able to search only with a "from" but its not the end of the world

Author Comment

ID: 41795116
Scott, i will try your code tonight, thanks alot

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