Question

i would like to compute the data from a table where it consists date, and data ..there are a lot of data inside the table. example are as below:

DATE       hour  data1  data2
-------------------------------
01/01/2010  1    10860  1234    
01/01/2010  2    10861  1234    
01/01/2010  3    10862  1234    
01/01/2010  4    10863  567   
01/01/2010  5    10864  458    
02/01/2010  1    10865  3467    
02/01/2010  2    10866  7890    
02/01/2010  3    10867  863    
02/01/2010  4    10868  0    
02/01/2010  5    10868  698  
03/01/2010  1    10868  4693  
03/01/2010  2    10868  7853  
03/01/2010  3    10868  5987

and from above data. i would like to compute it into a table like this:

DATE           sdata1  sdata2
-------------------------------
01/01/2010     54310   4727    
02/01/2010     54334   12918    
03/01/2010     32604   18533

the sdata1 and sdata2 are the sum of the data that computed … is there any way for me to compute the data into above data display? thank you … hehe …

Answer 1

SELECT DATE, SUM(data1) AS sdata1, SUM(data2) AS sdata2 FROM table1 GROUP BY DATE;

Try this and let me know if that is what you’re looking for. You can also use the WHERE DATE BETWEEN startDate AND endDate if you needed a range.

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Another trick if you wanted this data in another table to do “stuff” with, would be to:

CREATE TABLE table2 (SELECT DATE, SUM(data1) AS sdata1, SUM(data2) AS sdata2 FROM table1 GROUP BY DATE);

This will perform query above but create a new table with the results. I’m not sure why you might need that but sometimes de-normalizing and having computed information in a table for display can speed up your app.

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If you have a table already then you can do the following:

INSERT INTO table2 (DATE, sdata1, sdata2) VALUES (SELECT DATE, SUM(data1) AS sdata1, SUM(data2) AS sdata2 FROM table1 GROUP BY DATE);