I would like the numbering of tables in a section to be in the following format:
Table section_number alpha: table caption.
For examples, tables of section 4.3 should look like:
Table 4.3 a: Table one of section 4.3
Table 4.3 b: Table two of section 4.3
How can I do it?
Writing this in your preamble:
should produce table labels and counters as you describe (unsure you want the label in sans serif font!). Here is an example produced with that code in a standard class of documents: