Mysql query Sum with Case - php
I have two tables.
One contains default data for 3 columns, (value is 1 or 0) In the same table is a ClientID
Another table contains edited data with a date, ClientID and a extra column named 'Changed'
If Changed = 1 then the values in the 3 columns are changed and therefore need to be read from the second table.
This al works fine, but I want to make a report in php where a daterange can be selected and a query should group by ClientID and count all 1's in the selected daterange of the 3 columns. (Each column seperate)
Here's the trick: When Changed = 0 in the specific row then It should check the default value and if Changed = 1 it should check the second table. And then count it with the previous rows.
I hope you understand what I want to create
You can use IF function from SQL
For example
SELECT SUM(IF(Changed=1, t1.col1, t2.col2)) FROM t1, t2 WHERE t1.id=t2.id
This is example how you can use columns for case in SUM
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I have a column called chapter_number which is an Integer data type and is NOT auto increment as I have another field which uniquely identifies the row.
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Table structure:
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What would I put for the first parameter ^
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I think you can use GREATEST() function try this sqlFiddle
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