How to insert multiple values in table using subquery in Oracle? - sql

Question

I have created two new tables TYPE and OPERATION-
TYPE table has the following columns
TYPE
(TYPE_ID : integer, with sequence
TYPE_NAME : String
BASE_ID :
)
The default values for TYPE_NAME are (Type1, Type2, Unknown) which needs to be added for every BASE_ID which is 68 rows in the BASE table
So there need to be 3 entries for every BASE_ID in the TYPE table
OPERATION table has the following columns
OPERATION
(OPERATION_ID : integer, with sequence
OPERATION_NAME : String
BASE_ID :
)
The default values for OPERATION_NAME are (Operation1, Operation2, Unknown) which needs to be added for every BASE_ID which is 68 rows in the BASE table
So there need to be 3 entries for every BASE_ID in the OPERATION table
Can someone please help me with a query so that I can perform this process of multiple entry with ease.
Thank you in advance.

Answer 1

Had to individually add query like this
INSERT INTO TYPE(TYPE_ID, TYPE_NAME, BASE_ID) (
select TYPE_SEQ.nextval, 'Type 1', ID_BASE FROM BASE);
INSERT INTO TYPE(TYPE_ID, TYPE_NAME, BASE_ID) (
select TYPE_SEQ.nextval, 'Type 2', ID_BASE FROM BASE);
INSERT INTO TYPE(TYPE_ID, TYPE_NAME, BASE_ID) (
select TYPE_SEQ.nextval, 'Unknown', ID_BASE FROM BASE);

Answer 2

CTE with cross join might help. Here's how.
Creating tables and a sequence first; my base table contains only 3 rows (as opposed to your 68 rows; just for simplicity. You don't have to create the base table as you already have it):
SQL> create table base as
2 select 1 base_id from dual union all
3 select 2 base_id from dual union all
4 select 3 base_id from dual;
Table created.
SQL> create sequence seqankit;
Sequence created.
SQL> create table type (type_id number, type_name varchar2(20), base_id number);
Table created.
SQL> create table operation (operation_id number, operation_name varchar2(20), base_id number);
Table created.
SQL>
Inserting into type and operation tables:
SQL> insert into type (type_id, type_name, base_id)
2 with names (type_name) as
3 (select 'type1' from dual union all
4 select 'type2' from dual union all
5 select 'unknown' from dual
6 )
7 select seqankit.nextval, n.type_name, b.base_id
8 from names n cross join base b;
9 rows created.
SQL> insert into operation (operation_id, operation_name, base_id)
2 with names (operation_name) as
3 (select 'operation1' from dual union all
4 select 'operation2' from dual union all
5 select 'unknown' from dual
6 )
7 select seqankit.nextval, n.operation_name, b.base_id
8 from names n cross join base b;
9 rows created.
SQL>
What's the result?
SQL> select * from type order by base_id, type_name;
TYPE_ID TYPE_NAME BASE_ID
---------- -------------------- ----------
1 type1 1
4 type2 1
7 unknown 1
2 type1 2
5 type2 2
8 unknown 2
3 type1 3
6 type2 3
9 unknown 3
9 rows selected.
SQL> select * from operation order by base_id, operation_name;
OPERATION_ID OPERATION_NAME BASE_ID
------------ -------------------- ----------
10 operation1 1
13 operation2 1
16 unknown 1
11 operation1 2
14 operation2 2
17 unknown 2
12 operation1 3
15 operation2 3
18 unknown 3
9 rows selected.
SQL>
Looks OK to me.

Answer 3

You can create a trigger that inserts the value for column TYPE_ID.
create trigger TYPE_INS
before insert on TYPE
for each row
when (new.TYPE_ID is null)
begin
:new.TYPE_ID := TYPE_SEQ.nextval;
end;
Then you don't need the TYPE_ID column in the INSERT statement, which allows you to do...
insert into TYPE (TYPE_NAME, BASE_ID)
select 'Type1', BASE_ID
from BASE
union
select 'Type2', BASE_ID
from BASE
union
select 'Unknown', BASE_ID
from BASE