You would use:
$("#myTable > tbody");
which selects tbody
elements that are the direct descendant of #myTable
.
Alternatively, you could use:
$('tbody', '#myTable');
which finds all tbody
elements within the context of #myTable
.
In jQuery, there are often several ways to accomplish what you need.
Another way, would be to do:
$('#myTable').children('tbody');
which is effectively the same as my first solution above.
jQuery has great docs:
Selectors: http://api.jquery.com/category/selectors/
Traversing: http://api.jquery.com/category/traversing/