1 2 3 4 5 6 7 8 9 10 11 12 13 14
b NULL b 1a20 1e+ 1e+10 1 10000000001 a$1 $b c$ 1 2 3 table type possible_keys key key_len ref rows Extra t2 ref B B 21 const 1 where used a B 3 world