title: How to make a kind of pivot with strings?
body: <p>I have a table like</p>
  <pre><code>+-----+--------+---------+
  | URL | Label  | Value   |
  +-----+--------+---------+
  | u1  | label3 | param1  |
  +-----+--------+---------+
  | u2  | label2 | param3  |
  +-----+--------+---------+
  | u3  | label1 | param2  |
  +-----+--------+---------+
  | u2  | label4 | param5  |
  +-----+--------+---------+
  | u1  | label6 | param4  |
  +-----+--------+---------+
  | u3  | label5 | param6  |
  +-----+--------+---------+
  | u3  | label3 | param11 |
  +-----+--------+---------+
  | u2  | label5 | param15 |
  +-----+--------+---------+
  | u1  | label1 | param8  |
  +-----+--------+---------+
  | u2  | label6 | param18 |
  +-----+--------+---------+
  | u1  | label5 | param16 |
  +-----+--------+---------+
  | u3  | label2 | param9  |
  +-----+--------+---------+
  | u3  | label4 | param14 |
  +-----+--------+---------+
  | u2  | label3 | param12 |
  +-----+--------+---------+
  | u1  | label2 | param10 |
  +-----+--------+---------+
  | u3  | label6 | param17 |
  +-----+--------+---------+
  | u1  | label4 | param13 |
  +-----+--------+---------+
  | u2  | label1 | param7  |
  +-----+--------+---------+
  </code></pre>
  <p>Labels and values are alphanumeric strings.</p>
  <p>I want to shorten the table and place each label into own column and values into url rows, so the table become looking like</p>
  <pre><code>+-----+--------+---------+---------+---------+---------+---------+
  | url | label1 | label2  | label3  | label4  | label5  | label6  |
  +-----+--------+---------+---------+---------+---------+---------+
  | u1  | param8 | param10 | param1  | param13 | param16 | param4  |
  +-----+--------+---------+---------+---------+---------+---------+
  | u2  | param7 | param3  | param12 | param5  | param15 | param18 |
  +-----+--------+---------+---------+---------+---------+---------+
  | u3  | param2 | param9  | param11 | param14 | param6  | param17 |
  +-----+--------+---------+---------+---------+---------+---------+
  </code></pre>
  <p>I tried to build a pivot - and got it partly work: urls are as column, labels are like headings of own columns - but pivot seems to only calculate, and I failed on getting values displayed.</p>
  <p>What is the way for such table transformation?</p>