I work for a company that makes trading software for financial advisors. In terms of tables, here are some of our design standards:
- Columns with numbers are right-aligned.
- Columns with text are left-aligned.
- Columns containing both numbers and text are right-aligned.
- Black text for positive numbers, red text in parentheses for negative numbers.
- Zebra striping for ease of viewing (implemented in response to requests from our clients)
- Each table has a title at the top left as well as a header row.
- Links within tables appear as underlined black text.
- Users are allowed to choose how many rows of data they want to see, in set increments (10, 25, 50, 100, 200, all -- part of this has to do with the backend Java library we use).
- All columns are sortable, unless there is a very good reason they should not be.
- Column headers are persistent.
Some good reading on these design patterns:
Text/number alignments: https://ux.stackexchange.com/questions/13795/is-there-a-standard-to-left-justify-text-and-right-justify-numeric-values
Black text/red text/parentheses: https://en.wikipedia.org/wiki/Negative_number
A good argument for zebra striping: https://alistapart.com/article/zebrastripingmoredataforthecase
Persistent Column Headers: http://uxmovement.com/content/9-design-techniques-for-user-friendly-tables/
I hope that helps! Let me know if I can answer any specific questions.