Is there a way to output certain rows (or filter) from a table? Here's an example, I have three columns in a table: ClassQuarter, Course No, Description.

I would like to output rows only with ClassQuarter == '1' in a HTML table, then output rows where ClassQuarter == '2' in another table, then output rows where ClassQuarter == '3' in another table.

Am I able to output rows with a condition for the first column?
Since there are a set number of quarters you can probably just collect the entries in a temporary array. Then use those to build your tables.

{% set quarter1 = [] %}
{% set quarter2 = [] %}
{% set quarter3 = [] %}

{% for row in entry.courses %}

    {% if row.classQuarter == 1 %}
        {% set quarter1 = quarter1|merge([row]) %}
    {% endif %}

    {% if row.classQuarter == 2 %}
        {% set quarter2 = quarter2|merge([row]) %}
    {% endif %}

    {% if row.classQuarter == 3 %}
        {% set quarter3 = quarter3|merge([row]) %}
    {% endif %}

{% endfor %}

&lt;table&gt;
    {% for row in quarter1 %}
        &lt;tr&gt;
            &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
            &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
        &lt;/tr&gt;    
    {% endfor %}
&lt;/table&gt;

&lt;table&gt;
    {% for row in quarter2 %}
        &lt;tr&gt;
            &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
            &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
        &lt;/tr&gt;    
    {% endfor %}
&lt;/table&gt;

&lt;table&gt;
    {% for row in quarter3 %}
        &lt;tr&gt;
            &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
            &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
        &lt;/tr&gt;    
    {% endfor %}
&lt;/table&gt;


You could also add an 'if' clause in the 'for...in' loop. See the twig docs on adding a condition for more info.

&lt;table&gt;
    {% for row in entry.courses if row.classQuarter == 1 %}
        &lt;tr&gt;
            &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
            &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
        &lt;/tr&gt; 
    {% endfor %}
&lt;/table&gt;
&lt;table&gt;
    {% for row in entry.courses if row.classQuarter == 2 %}
        &lt;tr&gt;
            &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
            &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
        &lt;/tr&gt; 
    {% endfor %}
&lt;/table&gt;
&lt;table&gt;
    {% for row in entry.courses if row.classQuarter == 3 %}
        &lt;tr&gt;
            &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
            &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
        &lt;/tr&gt; 
    {% endfor %}
&lt;/table&gt;


And could also probably condense that using the range shortcut.

{% for quarter in 1..4 %}
    &lt;table&gt;
        {% for row in entry.courses if row.classQuarter == quarter %}
            &lt;tr&gt;
                &lt;td&gt;{{ row.courseNumber }}&lt;/td&gt;
                &lt;td&gt;{{ row.courseDescription }}&lt;/td&gt;
            &lt;/tr&gt; 
        {% endfor %}
    &lt;/table&gt;
{% endfor %}