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PODatabase design help
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  1. PODatabase design help
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    copied!<p><pre><code> CREATE TABLE <code>cards</code> ( <code>id</code> INTEGER(1) NOT NULL AUTO_INCREMENT, <code>name</code> VARCHAR(50) NOT NULL DEFAULT 'NULL', <code>expire</code> DATETIME NOT NULL DEFAULT 'NULL', PRIMARY KEY (<code>id</code>) );</p> <p>CREATE TABLE <code>services</code> ( <code>id</code> INTEGER AUTO_INCREMENT DEFAULT NULL, <code>name</code> VARCHAR(50) NOT NULL DEFAULT 'NULL', PRIMARY KEY (<code>id</code>) );</p> <p>CREATE TABLE <code>shops</code> ( <code>id</code> INTEGER AUTO_INCREMENT DEFAULT NULL, <code>name</code> VARCHAR(50) NOT NULL DEFAULT 'NULL', PRIMARY KEY (<code>id</code>) );</p> <p>CREATE TABLE <code>card_transactions</code> ( <code>id</code> INTEGER AUTO_INCREMENT DEFAULT NULL, <code>id_card</code> INTEGER(1) NOT NULL, <code>funds</code> DOUBLE(6,2) NOT NULL, <code>timeCET</code> DATETIME NOT NULL, <code>id_shops</code> INTEGER DEFAULT NULL, <code>id_services</code> INTEGER DEFAULT NULL, <code>id_payment_systems</code> INTEGER DEFAULT NULL, <code>user</code> ENUM('y','n') NOT NULL, PRIMARY KEY (<code>id</code>) );</p> <p>CREATE TABLE <code>payment_systems</code> ( <code>id</code> INTEGER AUTO_INCREMENT DEFAULT NULL, <code>name</code> VARCHAR(50) NOT NULL, PRIMARY KEY (<code>id</code>) );</p> <p>CREATE TABLE <code>shop_sales</code> (<code> <code> <code>id</code> INTEGER AUTO_INCREMENT DEFAULT NULL, <code>id_shops</code> INTEGER DEFAULT NULL, <code>delivery_price</code> DOUBLE NOT NULL, sales price</code> DOUBLE NOT NULL, PRIMARY KEY (id</code>) ); </pre></code></p> <p>Sorry i have an image but can't post it. So i post the code.<br /> Is this a good db design? Would it be better if replace the last four columns from card_transactions table with for example reference_id and put them in new table called reference?</p>
 

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