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n1
1
2
NULL
count(distinct n1)
2
n2
11
12
13
NULL
count(distinct n2)
3
s
one
two
NULL
count(distinct s)
2
vs
eleven
twevle
thirteen
NULL
count(distinct vs)
3
t
eleven
twelve
foo
bar
NULL
count(distinct t)
4
n1 n2
1 11
2 11
2 12
2 13
NULL 13
2 NULL
count(distinct n1,n2)
4
n1 s
1 one
2 two
NULL two
2 NULL
count(distinct n1,s)
2
s n1 vs
one 1 eleven
two 2 eleven
two 2 twevle
two 2 thirteen
two NULL thirteen
NULL 2 thirteen
two 2 NULL
count(distinct s,n1,vs)
4
s t
one eleven
two eleven
two twelve
two foo
two bar
NULL bar
two NULL
count(distinct s,t)
5
count(distinct n1) count(distinct n2)
2 3
count(distinct n2) n1
1 NULL
1 1
3 2
count(distinct n)
5000
Variable_name Value
Created_tmp_disk_tables 1
count(distinct s)
5000
Variable_name Value
Created_tmp_disk_tables 1
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