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POSelect data: paginating data from multiple tables with inconsistent dates
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I have 8 separate tables. Each table has id, a datetime field and some text. I am presenting data combined from all tables on a single page in a timeline view, most recent entries are at the top, and entries from each table are mixed in this timeline. Now the hard part - I need to add pagination to this website, so on each page I want to show exactly 10 days (except for the last page, that may have less than 10). Each table may have variable number of rows. I've been struggling with this for quite some time but have not yet come up with an elegant solution. Here's an example (I'll pick only two tables for this example to make it simpler). <h2>tableA</h2> Apr 1 | a1 Apr 5 | a2 Apr 7 | a3 <h2>tableB</h2> Apr 2 | b1 Apr 2 | b2 Apr 5 | b3 Apr 6 | b4 Global timeline would look like this <hr> Apr 7 a3 Apr 6 b4 Apr 5 a2 Apr 5 b3 Apr 2 b2 Apr 2 b1 Apr 1 a1 And if each page shows only 3 days, I need for it to look like this: --- p1 --- Apr 7 a3 Apr 6 b4 Apr 5 a2 --- p2 --- Apr 5 b3 Apr 2 b2 Apr 2 b1 --- p3 --- Apr 1 a1 The problem is - I can't figure out a way to query for this data in an elegant way. Here's some live query that I've been messing with: select date(d.entryTime) entryDate, date(wc.changeTime) wcDate from diary_entry d join water_change wc on d.aquariumId = wc.aquariumId where d.aquariumId = 2 group by entryDate order by entryDate limit 10, 5 so, for one table I have this query: select date(d.entryTime) entryDate from diary_entry d where d.aquariumId = 2 group by entryDate it yields 13 results entryDate 2012-01-13 2012-01-14 2012-01-25 2012-01-26 2012-01-31 2012-02-04 2012-02-17 2012-02-20 2012-02-25 2012-03-17 2012-03-31 2012-04-01 2012-04-06 and for another: select date(wc.changeTime) changeDate from water_change wc where wc.aquariumId = 2 group by changeTime it yields 8 results 2012-01-22 2012-01-26 2012-02-17 2012-02-25 2012-03-04 2012-03-10 2012-04-04 2012-04-24 There are three common days between the two 2012-01-26 2012-02-17 2012-02-25 So the query that I need to produce would have to have 13 + 8 - 3 rows = 18 rows And solution is found! (select date(d.entryTime) activityDate from diary_entry d where d.aquariumId = 1 group by activityDate) union (select date(wc.changeTime) activityDate from water_change wc where wc.aquariumId = 1 group by activityDate order by activityDate) limit 10, 10
Tags
<mysql><sql><pagination>
Title
Select data: paginating data from multiple tables with inconsistent dates
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1. PO
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1. UStumanov
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1. UStumanov
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 POSelect data: paginating data from multiple tables with inconsistent dates
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1. CODefine your problem. Is the problem making the query? Getting the data to the front end? Paginating? I don't know where to begin to help you.
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 POSelect data: paginating data from multiple tables with inconsistent dates
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2. COJust edited the original question with an example and some extra notes.
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 POSelect data: paginating data from multiple tables with inconsistent dates
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 UStumanov

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