Table1
id
Table2
id
Table3
id|table1_id|table2_id
I need the SQL (using MySQL) statement for:
for each row in table1 {
for each row in table2 {
insert in table3 values table1.id, table2.id;
}
Does an insert/select statement exists ? Or do I have to use a loop ?
You don't need to use loops at all. You should be thinking in terms of SETS when using a relational database.
Here is the correct way to achieve this. First using the CROSS JOIN
to create a cartesian set of all the combinations of ids from table1 and table2. Then inserting that entire set into table3 Note: I am assuming Table3 ID is an auto-number.
INSERT INTO TABLE3 (TABLE1_ID,TABLE2_ID)
SELECT T1.ID
,T2.ID
FROM TABLE1 T1
CROSS JOIN
TABLE2 T2
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