sql select data with multiple arguments - sql

Question

i stuck with this problem, please help!
Here is the problem:
I have a catalog and line detail table. Such as;
Line detail table: TRANSACTIONS_LINE_DETAIL catalog table: CATALOG
In TRANSACTIONS_LINE_DETAIL table: SQ_TRANSACTION_LINE_DETAIL_ID, RF_TRANSACTION_ID, CH_ITEM_CODE,.. columns are included.
In CATALOG table: CH_ITEM_CODE, CH_ITEM_NAME,.. columns are included. (CH_ITEM_CODE is unique)
TRANSACTIONS_LINE_DETAIL table and CATALOG table relates each other by their CH_ITEM_CODE columns.
So my problem is;
I wanna write a query that fetches me transaction ids (RF_TRANSACTION_ID) which has X,Y and Z item names together. (CH_ITEM_NAME).
Below code couldn't help me;
SELECT RF_TRANSACTION_ID
FROM TRANSACTIONS_LINE_DETAIL TLD, CATALOG CAT
WHERE TLD.CH_ITEM_CODE= CAT.CH_ITEM_CODE
AND CAT.CH_ITEM_NAME IN ('X', 'Y', 'Z')
GROUP BY RF_WO_ID
HAVING COUNT(1) = 3
The query should fetch me transaction ids that can have;
X, Y, Z
or
A, B, C, X, Y, Z
or
X, Y, Z, P
but NOT
X
or
X, Y
or
Z, Y, A, B

Answer 1

You need to move the condition to the having clause:
SELECT RF_TRANSACTION_ID
FROM TRANSACTIONS_LINE_DETAIL TLD join
CATALOG CAT
on TLD.CH_ITEM_CODE = CAT.CH_ITEM_CODE
where cat.ch_item_name in ('X', 'Y', 'Z')
GROUP BY RF_TRANSACTION_ID
HAVING sum(case when CAT.CH_ITEM_NAME = 'X' then 1 else 0 end) > 0 and
sum(case when CAT.CH_ITEM_NAME = 'Y' then 1 else 0 end) > 0 and
sum(case when CAT.CH_ITEM_NAME = 'Z' then 1 else 0 end) > 0;
This is an example of a "set-within-sets" query. I like doing these with the logic in the having clause, because it makes it more general.
This version includes a where clause, which (in your case) makes the query more efficient.
Each condition in the having clause is counting the row that match a particular condition.
To add Q, for instance, is quite easy (this condition is in your query but not in the sample results):
SELECT RF_TRANSACTION_ID
FROM TRANSACTIONS_LINE_DETAIL TLD join
CATALOG CAT
on TLD.CH_ITEM_CODE = CAT.CH_ITEM_CODE
GROUP BY RF_TRANSACTION_ID
HAVING sum(case when CAT.CH_ITEM_NAME = 'X' then 1 else 0 end) > 0 and
sum(case when CAT.CH_ITEM_NAME = 'Y' then 1 else 0 end) > 0 and
sum(case when CAT.CH_ITEM_NAME = 'Z' then 1 else 0 end) > 0 and
sum(case when CAT.CH_ITEM_NAME = 'Q' then 1 else 0 end) > 0;
If you wanted to find transactions with X, Y, Z, but not Q, the last condition would be = 0.