I wish it were possible to execute SQL on tables in org-mode buffers. Filtering rows and columns, joining values across named tables, and so forth could be done with SQL in the org-table SEND clauses.
There's a script called csvsql that allows for executing SQL on comma- or tab-separated files from the command-line (using the H2 database engine): https://github.com/jdurbin/durbinlib/wiki/csvsql
. I'm thinking csvsql or similar could provide the query capability, and org-mode would take care of sending it org tables in tab separated format.
That's my wish.