title: if else sql with additional information
body: <p>i have a case that the new column in sql contain of additional information, this is example</p>
  <pre><code>  A  |      B
    2     Increase 2
   -3     Decrease -3
    0     Not changed
   Null   Not changed
  </code></pre>
  <p>anyone can help me to solve this B column that use if-else statement, i have tried with this code</p>
  <pre><code>if(a&gt;0, &quot;increase&quot;+a, &quot;decrease&quot;+a) as B
  </code></pre>
  <p>but i get error. anyone can help me please?
  thank you in advance</p>