I’m trying to insert values id_team_FK and id_location_FK which both come from the same table. For example id_team_FK = 4 and id_location_FK = 150. The problem is, id_team_FK must be a randomly chosen value from team_table ( this works) and I need to know the exact number ( for example 4 ) to realize which id_location_FK is assigned to it ( for example 150 ). How do I make it work ?
insert into test (PK, id_team_FK,id_location_FK) values (1, -- Selects random number from table (select * from (id_team_FK from team_table order by dbms_random.random) where rownum=1), -- needs to know the value of id_team_FK to know what select... (select * from ( select id_location_FK from team_table) where team_table.id_team_FK = id_team_FK));
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Answer
How about CTEs? Select ID_TEAM_FK
first, use it to fetch ID_LOCATION_FK
, insert the result.
INSERT INTO test (pk, id_team_fk, id_location_fk) WITH temp AS -- select random number from table (SELECT id_team_fk FROM ( SELECT id_team_FK FROM team_table ORDER BY DBMS_RANDOM.random) WHERE ROWNUM = 1), temp2 AS -- now you know ID_TEAM_FK (you fetched it in the TEMP CTE), so - fetch ID_LOCATION_FK (SELECT id_team_fk, id_location_fk FROM (SELECT a.id_team_fk, b.id_location_FK FROM team_table a CROSS JOIN temp b WHERE a.id_team_FK = b.id_team_FK)) SELECT 1, id_team_fk, id_location_fk FROM temp2;