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POProduct/ Category management in mongoDB and MySQL
 

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    <p>I am a newbie with mongoDB. I write a simple application to manage product. I use mongoDB. This is my database</p> <p><code>Category</code> Collection:</p> <pre><code>db.category.insert({id:1,name:"Motor",description:"Sell Motor"}) db.category.insert({id:2,name:"Car":description:"Sell Car"}) </code></pre> <p><code>Product</code> Collection:</p> <pre><code>db.product.insert({id:1,name:"Honda CBR",price:15000,id_category:1}) db.product.insert({id:2,name:"Kawasaki ",price:16000,id_category:1}) db.product.insert({id:3,name:"Ford", price:50000,id_category:2}) </code></pre> <p>I think to find <code>Product</code> with <code>Category</code> name is <code>Motor</code>, I have to write tree queries:</p> <pre><code>var result = db.category.find({name:"Motor"}) var cat = result.next().id db.product.find({id_category:cat}) </code></pre> <p>In MySQL I can do the same thing with two table:</p> <pre><code>CREATE TABLE `product_manage`.`category`( `id` INT NOT NULL AUTO_INCREMENT, `name` VARCHAR(2000), `description` VARCHAR(2000), PRIMARY KEY (`id`) ); CREATE TABLE `product_manage`.`product`( `id` INT NOT NULL, `name` VARCHAR(2000), `price` INT, `id_category` INT, PRIMARY KEY (`id`) ); </code></pre> <p>So I don't know what is the advantage of MongoDB over MySQL in this example. I want to ask some more:</p> <p>In mysql:</p> <p>case a:</p> <pre><code>select id into @id_cat where name="Motor" select * from product where id_category = @id_cat </code></pre> <p>case b:</p> <pre><code>select p.id,p.name,p.price from product p,category where p.id_category = category.id and category.name = "Motor" </code></pre> <p>Which case is good for performance?</p>
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    1. COSee [Join operation with NOSQL](http://stackoverflow.com/a/1996579).
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