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I have these two tables in MySQL database:
tbl_hashs >
| h_id | r_id | hash |
|---|---|---|
| 1 | 122 | xx |
| 2 | 123 | xx |
tbl_sandbox >
| h_id | r_id | hash |
|---|---|---|
| NULL | NULL | xx |
finally I want to have this table:
query result should be like >>>
| h_id | r_id | hash |
|---|---|---|
| 1 | 122 | xx |
| 1 | 123 | xx |
| 2 | 122 | xx |
| 2 | 123 | xx |
I think something like "Cartesian multiplication" can help me. but I can’t do it in MySQL.
please somebody help me with proper query.
>Solution :
SELECT
t1.h_id,
t2.r_id,
t2.hash
FROM tbl_hashs t1
CROSS JOIN tbl_hashs t2
ORDER BY t1.h_id
But I did not use tbl_sandbox, is that good ?
https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=32926caddc063c2adcbc03944ce489ce