Find count of combination of 2 columns - Oracle SQL : <p>I have a table</p>

<pre><code>table_user
col1      col2
123       456
124       457
125       458
126       459
127       460
128       461
123       456
123       456
123       457
</code></pre>

<p>I need to find out the combination of col1 and col2 with counts.</p>

<p>In above example:</p>

<pre><code>col1      col2   count_combination
123       456    3
123       457    1
124       457    1
125       458    1
126       459    1
127       460    1
128       461    1
</code></pre>

<p>How can I find it?</p>
