Query to only reach the one-to-one relationship data
HelloI am looking for a query search lines with one-to-one relation ship.
To keep it simple here is the code example.
CREATE TABLE my_storegroup_gbcust
(
store_grp_id NUMBER(6) NOT NULL,
group_buy_cust_num NUMBER(5) NOT NULL
);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1002, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1003, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1004, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1005, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1006, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (2001, 65000);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (28001, 21800);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (35001, 27010);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (35001, 37927);
select * from MY_STOREGROUP_GBCUST
STORE_GRP_ID GROUP_BUY_CUST_NUM
------------ ------------------
1002 70001
1003 70001
1004 70001
1005 70001
1006 70001
-----------------------------
2001 65000
-----------------------------
28001 21800
-----------------------------
35001 27010
35001 37927
The data in the table describe 3 types of relationships.Many-to-one = > several groups to buy a group of stores = > example: 1002,1003,1004,1005,1006 mapped to 7001
One-to-one = > Group a store to buy a group only = > example: 2001 mapped to 65000. 28001 mapped to 21800
One-to-many = > store group in many group buy = > example: 35001 mapped to 27010,37927
I am now able to achieve through one-to-many and many-to-one query per as below:
select group_buy_cust_num,count(*) from MY_STOREGROUP_GBCUST group by group_buy_cust_num having count(*) > 1
select store_grp_id,count(*) from MY_STOREGROUP_GBCUST group by store_grp_id having count(*) > 1
But how do individual exclusively.Thank you
Raj.
Hello
A way
select store_grp_id
, group_buy_cust_num
, case when x = 1
then case when y = 1
then 'One to One'
else 'One to Many'
end
else 'Many to one'
end z
from (
select store_grp_id
, group_buy_cust_num
, count(*) over (partition by store_grp_id order by null) x
, count(*) over (partition by group_buy_cust_num order by null) y
from my_storegroup_gbcust
)
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Anurag Tibrewal
Tags: Database
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