SQL Grouping SUM Post: 302587288

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Top Forums Programming SQL Grouping SUM Post 302587288 by rbatte1 on Wednesday 4th of January 2012 11:51:24 AM

01-04-2012

Moderator

Not sure if this is strictly a unix issue, but in any case,......

What database are you using? There is likely a date/time function we can call in your query to produce your results straight off the bat.

Your logic of using a where clause based on being like '%/00', thrn '%/01' etc. could generate you spurious values.

Something like:

Code:

SELECT to_char(to_date(data,'yymmdd/hhmi'),'yymmdd/hh') timestamp , SUM(tot) sumtot
FROM table
GROUP BY timestamp
ORDER BY timestamp ;

Might get you started and perhaps use of a trimming function to ignore the minutes value will get the actul result you want straight from the SQL query, but like I say, it depends on the database server you are using.

Wholly untested bit of theory, but I hope that this helps a bit. If you respond with the database software, you may get a complete response. In my opinion you would save processing time to get the database to perform the work within the initial query rather than get the data to a file then post-process it to create the output you want. You can use the to_char function of many databases to give you date/time output in the format you want too.

Robin
Liverpool/Blackburn,
UK

rbatte1

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MYSQL_UNBUFFERED_QUERY(3)						 1						 MYSQL_UNBUFFERED_QUERY(3)

mysql_unbuffered_query - Send an SQL query to MySQL without fetching and buffering the result rows.

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