SQL Taskbook Level 5.8

The tables are given:

letters
character
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
numbers
number
1
2
3
4
5
6
7
8
9
10
11

Solve the following problems for them:

Задание 1

Get combinations of all letters and numbers

Задание 2

Get combinations of all numbers and letters