BigQuery to count if two record values is greater than or equal the values in their columns and find percent overall - google-bigquery

Question

Let say I have a table of millions of records resulting from a simulation, below sample
TO Sim DUR Cost
1 1 20 145
1 2 24 120
1 3 27 176
1 4 30 170
1 5 23 173
1 6 26 148
1 7 21 175
1 8 22 171
1 9 23 169
1 10 23 178
2 1 23 172
2 2 29 152
2 3 25 162
2 4 20 179
2 5 26 154
2 6 27 137
2 7 27 131
2 8 28 148
2 9 25 156
2 10 22 169
how to do the calculation in BigQuery to find the percent count of rows that are satisfying two conditions. (i can do a UDF but I would like it to be all in SQL statements)
The excel equivalent to the new calculated column would be =countifs($C$2:$C$21,">="&C2,$D$2:$D$21,">="&D2,$A$2:$A$21,A2) / countif($A$2:$A$21,A2)
the results would look like
TO Sim DUR Cost f0
1 1 20 145 0.90
1 2 24 120 0.40
1 3 27 176 0.10
1 4 30 170 0.10
1 5 23 173 0.30
1 6 26 148 0.30
1 7 21 175 0.30
1 8 22 171 0.40
1 9 23 169 0.50
1 10 23 178 0.10
2 1 23 172 0.10
2 2 29 152 0.10
2 3 25 162 0.10
2 4 20 179 0.10
2 5 26 154 0.10
2 6 27 137 0.30
2 7 27 131 0.40
2 8 28 148 0.20
2 9 25 156 0.20
2 10 22 169 0.20

Answer 1

Below is for BigQuery Standard SQL
#standardSQL
SELECT ANY_VALUE(a).*, COUNTIF(b.dur >= a.dur AND b.cost >= a.cost) / COUNT(1) calc
FROM `project.dataset.table` a
JOIN `project.dataset.table` b
USING (to_)
GROUP BY FORMAT('%t', a)
-- ORDER BY to_, sim
if to apply to sample data from your question - result is
Row to_ sim dur cost calc
1 1 1 20 145 0.9
2 1 2 24 120 0.4
3 1 3 27 176 0.1
4 1 4 30 170 0.1
5 1 5 23 173 0.3
6 1 6 26 148 0.3
7 1 7 21 175 0.3
8 1 8 22 171 0.4
9 1 9 23 169 0.5
10 1 10 23 178 0.1
11 2 1 23 172 0.1
12 2 2 29 152 0.1
13 2 3 25 162 0.1
14 2 4 20 179 0.1
15 2 5 26 154 0.1
16 2 6 27 137 0.3
17 2 7 27 131 0.4
18 2 8 28 148 0.2
19 2 9 25 156 0.2
20 2 10 22 169 0.2
Note: I am using field name to_ instead of to which is keyword and not allowed to be used as column name