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copied!<p>I want to do some statistic for the <code>Point</code> in my appliation,this is the columns for <code>Point</code> table:</p> <pre><code>id type city 1 food NewYork 2 food Washington 3 sport NewYork 4 food ..... </code></pre> <p>Each point belongs to a certain type and located at the certain city.</p> <p>Now I want to caculate the numbers of points in different city for each type.</p> <p>For example, there are two types here :<code>food</code> and <code>sport</code>.</p> <p>Then I want to know:</p> <pre><code>how many points of `food` and `sport` at NewYork how many points of `food` and `sport` at Washington how many points of `food` and `sport` at Chicago ...... </code></pre> <p>I have tried this:</p> <pre><code>select type,count(*) as num from point group by type ; </code></pre> <p>But I can not group the by the city.</p> <p>How to make it?</p> <h2><strong>Update</strong></h2> <pre><code>id type city 1 food NewYork 2 sport NewYork 3 food Chicago 4 food San </code></pre> <p>And I want to get something like this:</p> <pre><code> NewYork Chicago San food 2 1 1 sport 1 0 0 </code></pre> <p>I will use the html table and chart to display these datas.</p> <p>So I need to do the counting, I can use something like this:</p> <pre><code>select count(*) from point where type='food' and city ='San' select count(*) from point where type='food' and city ='NewYork' .... </code></pre> <p>However I think this is a bad idea,so I wonder if I can use the sql to do the counting.</p> <p>BTW,for these table data,how do people organization their structure using json?</p>

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