Joining tables
SELECT b.name, b.ra, b.dec, b.mag bmag,
r.mag rmag
FROM bsources b, rsources r
WHERE b.name = r.name;
    result:
NAME               RA        DEC       BMAG       RMAG
---------- ---------- ---------- ---------- ----------
NGC1234         12.34      45.67       17.3       19.3
NGC4321         23.45      56.78       18.2       17.2