I'd to create a database that records transactions between two users. A user can transfer points (think of it as money) to another user. user table looks like:
| userID | name | email | balance |
| ------------- |---------------|------------------|------------|
| 101 | alpha | alpha#mail.com | 1000 |
| 102 | bravo | bravo#mail.com | 500 |
| 103 | charlie | charlie#mail.com | 2000 |
And the transaction table should look like:
transactionID | from_user | to_user | transfer_amount |
| ------------- |---------------|------------------|------------------|
| 1 | 101 | 103 | 100 |
| 2 | 102 | 101 | 150 |
| 3 | 102 | 103 | 200 |
just i needed this result:
| row | from_user | to_user | transfer_amount |
| ------------- |---------------|------------------|------------------|
| 1 | alpha | charlie | 100 |
| 2 | bravo | alpha | 150 |
| 3 | bravo | charlie | 200 |
Could someone give hints to provide SQL Server code?
Select from_user, to_user, name, transfer_amount from transaction iner join users on trans.id==user.id;
SELECT T.TRANSACTION_ID,T.FROM_USER,U_FROM.NAME,
T.TO_USER,U_TO.NAME,T.TRANSFER_AMOUNT
FROM TRANSACTIONS AS T
JOIN USERS AS U_FROM ON T.FROM_USER=U_FROM.USER_ID
JOIN USERS AS U_TO ON T.TO_USER=U_TO.USER_ID
Something like this, I guess
Related
I would like to develop a database of the hotel, I have created two tables; one is Room and the second one is Customer.
Can I create a relationship between them that have updating data on the room table, which means every time a new customer. But the other table is for store customers data without removing old customers? For example:
Room Table:
Room_Id | available | Customer_Id |
101 | Yes |0 |
102 | Yes |0 |
103 | No | 1236 |
104 | No | 1237 |
105 | No | 1235 |
201 | No | 1234 |
202 | No | 1233 |
After updating room table:
Room_Id | available | Customer_Id |
101 | No | 1111 |
102 | No | 2222 |
103 | Yse | 0 |
104 | Yse | 0 |
105 | Yse | 0 |
201 | Yse | 0 |
202 | Yse | 0 |
Customer Table should store both data:
Customer_Id |
1111 |
2222 |
1236 |
1237 |
1235 |
1234 |
1233 |
I want something like this because when I try to update the room table, it also updates the customer table.
I hope my question is clear.
Thanks in advance.
I have a two datasets coming from 2 sources and i have to compare and find the mismatches. One from excel and other from Datawarehouse.
From excel Source_Excel
+-----+-------+------------+----------+
| id | name | City_Scope | flag |
+-----+-------+------------+----------+
| 101 | Plate | NY|TN | Ready |
| 102 | Nut | NY|TN | Sold |
| 103 | Ring | TN|MC | Planning |
| 104 | Glass | NY|TN|MC | Ready |
| 105 | Bolt | MC | Expired |
+-----+-------+------------+----------+
From DW Source_DW
+-----+-------+------+----------+
| id | name | City | flag |
+-----+-------+------+----------+
| 101 | Plate | NY | Ready |
| 101 | Plate | TN | Ready |
| 102 | Nut | TN | Expired |
| 103 | Ring | MC | Planning |
| 104 | Glass | MC | Ready |
| 104 | Glass | NY | Ready |
| 105 | Bolt | MC | Expired |
+-----+-------+------+----------+
Unfortunately Data from excel comes with separator for one column. So i have to use DelimitedSplit8K function to split that into individual rows. so i got the below output after splitting the excel source data.
+-----+-------+------+----------+
| id | name | item | flag |
+-----+-------+------+----------+
| 101 | Plate | NY | Ready |
| 101 | Plate | TN | Ready |
| 102 | Nut | NY | Sold |
| 102 | Nut | TN | Sold |
| 103 | Ring | TN | Planning |
| 103 | Ring | MC | Planning |
| 104 | Glass | NY | Ready |
| 104 | Glass | TN | Ready |
| 104 | Glass | MC | Ready |
| 105 | Bolt | MC | Expired |
+-----+-------+------+----------+
Now my expected output is something like this.
+-----+----------+---------------+--------------+
| ID | Result | Flag_mismatch | City_Missing |
+-----+----------+---------------+--------------+
| 101 | No_Error | | |
| 102 | Error | Yes | Yes |
| 103 | Error | No | Yes |
| 104 | Error | Yes | No |
| 105 | No_Error | | |
+-----+----------+---------------+--------------+
Logic:
I have to find if there are any mismatches in flag values.
After splitting if there are any city missing, then that should be reported.
Assume that there wont be any Name and city mismatches.
As a intial step, I'm trying to get the Mismatch rows and I have tried below query. It is not giving me any output. Please suggest where am going wrong.Check Fiddle Here
select a.id,a.name,split.item,a.flag from source_excel a
CROSS APPLY dbo.DelimitedSplit8k(a.city_scope,'|') split
where not exists (
select a.id,split.item
from source_excel a
join source_dw b
on a.id=b.id and a.name=b.name and a.flag=b.flag and split.item=b.city
)
Update
I have tried and got close to the answers with the help of temporary tables. Updated Fiddle . But not sure how to do without temp tables
I'm quite new to SQL - hope you can help:
I have several tables that all have 3 columns in common: ObjNo, Date(year-month), Product.
Each table has 1 other column, that represents an economic value (sales, count, netsales, plan ..)
I need to join all tables on the 3 common columns giving. The outcome must have one row for each existing combination of the 3 common columns. Not every combination exists in every table.
If I do full outer joins, I get ObjNo, Date, etc. for each table, but only need them once.
How can I achieve this?
+--------------+-------+--------+---------+-----------+
| tblCount | | | | |
+--------------+-------+--------+---------+-----------+
| | ObjNo | Date | Product | count |
| | 1 | 201601 | Snacks | 22 |
| | 2 | 201602 | Coffee | 23 |
| | 4 | 201605 | Tea | 30 |
| | | | | |
| tblSalesPlan | | | | |
| | ObjNo | Date | Product | salesplan |
| | 1 | 201601 | Beer | 2000 |
| | 2 | 201602 | Sancks | 2000 |
| | 5 | 201605 | Tea | 2000 |
| | | | | |
| | | | | |
| tblSales | | | | |
| | ObjNo | Date | Product | Sales |
| | 1 | 201601 | Beer | 1000 |
| | 2 | 201602 | Coffee | 2000 |
| | 3 | 201603 | Tea | 3000 |
+--------------+-------+--------+---------+-----------+
Thx
Devon
It sounds like you're using SELECT * FROM... which is giving you every field from every table. You probably only want to get the values from one table, so you should be explicit about which fields you want to include in the results.
If you're not sure which table is going to have a record for each case (i.e. there is not guaranteed to be a record in any particular table) you can use the COALESCE function to get the first non-null value in each case.
SELECT COALESCE(tbl1.ObjNo, tbl2.ObjNo, tbl3.ObjNo) AS ObjNo, ....
tbl1.Sales, tbl2.Count, tbl3.Netsales
The database I'm working on is DB2 and I have a problem similar to the following scenario:
Table Structure
-------------------------------
| Teacher Seating Arrangement |
-------------------------------
| PK | seat_argmt_id |
| | teacher_id |
-------------------------------
-----------------------------
| Seating Arrangement |
-----------------------------
|PK FK | seat_argmt_id |
|PK | Row_num |
|PK | seat_num |
|PK | child_name |
-----------------------------
Table Data
------------------------------
| Teacher Seating Arrangement|
------------------------------
| seat_argmt_id | teacher_id |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
------------------------------
---------------------------------------------------
| Seating Arrangement |
---------------------------------------------------
| seat_argmt_id | row_num | seat_num | child_name |
| 1 | 1 | 1 | Abe |
| 1 | 1 | 2 | Bob |
| 1 | 1 | 3 | Cat |
| | | | |
| 2 | 1 | 1 | Abe |
| 2 | 1 | 2 | Bob |
| 2 | 1 | 3 | Cat |
| | | | |
| 3 | 1 | 1 | Abe |
| 3 | 1 | 2 | Cat |
| 3 | 1 | 3 | Bob |
| | | | |
| 4 | 1 | 1 | Abe |
| 4 | 1 | 2 | Bob |
| 4 | 1 | 3 | Cat |
| 4 | 2 | 2 | Dan |
---------------------------------------------------
I want to see where there are duplicate seating arrangements for a teacher. And by duplicates I mean where the row_num, seat_num, and child_name are the same among different seat_argmt_id for one teacher_id. So with the data provided above, only seat id 1 and 2 are what I would want to pull back, as they are duplicates on everything but the seat id. If all the children on the 2nd table are exact (sans the primary & foreign key, which is seat_argmt_id in this case), I want to see that.
My initial thought was to do a count(*) group by row#, seat#, and child. Everything with a count of > 1 would mean it's a dupe and = 1 would mean it's unique. That logic only works if you are comparing single rows though. I need to compare multiple rows. I cannot figure out a way to do it via SQL. The solution I have involves going outside of SQL and works (probably). I'm just wondering if there is a way to do it in DB2.
Does this do what you want?
select d.teacher_id, sa.row_num, sa.seat_num, sa.child_name
from seatingarrangement sa join
data d
on sa.seat_argmt_id = d.seat_argmt_id
group by d.teacher_id, sa.row_num, sa.seat_num, sa.child_name
having count(*) > 1;
EDIT:
If you want to find two arrangements that are the same:
select sa1.seat_argmt_id, sa2.seat_argmt_id
from seatingarrangement sa1 join
seatingarrangement sa2
on sa1.seat_argmt_id < sa2.seat_argmt_id and
sa1.row_num = sa2.row_num and
sa1.seat_num = sa2.seat_num and
sa1.child_name = sa2.child_name
group by sa1.seat_argmt_id, sa2.seat_argmt_id
having count(*) = (select count(*) from seatingarrangement sa where sa.seat_argmt_id = sa1.seat_argmt_id) and
count(*) = (select count(*) from seatingarrangement sa where sa.seat_argmt_id = sa2.seat_argmt_id);
This finds the matches between two arrangements and then verifies that the counts are correct.
I have 3 like with many - many relationship
As:
TABLE 1 : select * from student;
| id | name |
| 1 | sone |
| 2 | stwo |
| 3 | sthree |
| 4 | sfour |
| 6 | ssix |
TABLE 2 : select * from course;
| id | name |
| 100 | CSE |
| 101 | ECE |
| 102 | ITI |
RELATION_SHIP TABLE : select * from student_course
| id | stu_id | cou_id |
| 1 | 1 | 101 |
| 2 | 2 | 102 |
| 3 | 2 | 100 |
| 4 | 3 | 100 |
| 5 | 3 | 101 |
| 6 | 1 | 101 |
| 1 | 6 | 101 |
I need to write a query to select a student with exactly one course 'CSE' and he should not have any other courses.
Thanks in advance
Use query:
SELECT
sc.`stu_id`,
COUNT(sc.`cou_id`) AS cnt
FROM
student_course sc
GROUP BY sc.`stu_id`
HAVING cnt = 1
AND GROUP_CONCAT(cou_id) LIKE
(SELECT
id
FROM
course
WHERE NAME = 'CSE')