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finding dates that exist but not in a certain period

Discuss finding dates that exist but not in a certain period in the Database Management forum on Dev Shed.
finding dates that exist but not in a certain period Database Management forum discussing non-database specific SQL. Structured Query Language was designed to be a robust and standardized language for manipulating relational databases.

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  #1  
Old June 27th, 2003, 08:19 AM
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finding dates that exist but not in a certain period
ok here is what i have. i have a log stored in a database, and i need to know how i can determine if an id has been inactive for for a certain time. how would i go about doing that? i tried selecting those that were active in the last period, but that doesn't exactly tell me who wasn't. so if someone has some code or an algorythm i'm all ears!
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Old June 27th, 2003, 08:30 AM
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Search for all dates outside of the define range.
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Old June 27th, 2003, 09:01 AM
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tried that but you could still have that id in the dates you didn't select, meaning that they were still active
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Old June 27th, 2003, 09:09 AM
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Are you looking for all ids that fall in a predefined time period?
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Old June 27th, 2003, 10:45 AM
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sorry, had a meeting. ok i need to see if an id hasn't shown up in the last 3 months based on the date period, so that i can display them, sortof an 'inactive account' way of presenting it.
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Old June 27th, 2003, 12:22 PM
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select id from table where activity + 90 days is less than today.
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Old June 30th, 2003, 09:38 AM
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so, how do i add 90 days (3 months) to each item in the database within my query?
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Old June 30th, 2003, 01:49 PM
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You could use the DATE_ADD(date,INTERVAL expr type) function.
http://www.mysql.com/doc/en/Date_an..._functions.html
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