I need some help writing a script to update a table.
The table has the following:
| StudentID | Name | Record | Label |
| 1 | Ed | 1 | 1 |
| 1 | Ed | 1 | 1 |
| 1 | Ed | 1 | 1 |
| 1 | Ed | 1 | 1 |
| 2 | Bob | 1 | 1 |
| 2 | Bob | 1 | 1 |
| 2 | Bob | 1 | 1 |
| 2 | Bob | 1 | 1 |
I would like to update the Record and Label columns, so that the query would increment the Record column from 1 to n for the same StudentId. The Label column would also need to be updated to display the record # of total number of records for that StudentId.
The result for Ed should be:
| StudentID | Name | Record | Label |
| 1 | Ed | 1 | 1 of 4 |
| 1 | Ed | 2 | 2 of 4 |
| 1 | Ed | 3 | 3 of 4 |
| 1 | Ed | 4 | 4 of 4 |
Hoping someone can help me with this.
Related
I am trying to join three separate tables based on certain criteria. Here are table examples:
TABLE A
+----+------------+----------+---------+
| id | entry num | line num | inv line|
+----+------------+----------+---------+
| 1 | 1 | 1 | 1 |
| 2 | 1 | 1 | 2 |
| 3 | 2 | 1 | 1 |
| 4 | 2 | 2 | 1 |
| 5 | 3 | 1 | 1 |
| 6 | 3 | 1 | 2 |
| 7 | 3 | 1 | 3 |
+----+------------+--------+-----------+
TABLE B
+----+------------+----------+---------+
| id | entry num | line num | code |
+----+------------+----------+---------+
| 1 | 1 | 1 | 100 |
| 2 | 2 | 1 | 370 |
| 3 | 2 | 2 | 120 |
| 4 | 3 | 1 | 300 |
+----+------------+--------+-----------+
TABLE C
+----+------------+--------+-----------+
| id | rate | amt | code |
+----+------------+--------+-----------+
| 1 | 25% | $50 | 100 |
| 2 | 50% | $20 | 370 |
| 3 | 50% | $25 | 120 |
| 4 | 30% | $150 | 300 |
+----+------------+----------+---------+
I need the final table to look like this, but I am at a loss on how to write the syntax:
FINAL TABLE
+----+------------+----------+---------+---------+---------+---------+
| id | entry num | line num | inv line| code | rate | amt |
+----+------------+----------+---------+---------+---------+---------+
| 1 | 1 | 1 | 1 | 100 | 25% | $50 |
| 2 | 1 | 1 | 2 | 100 | 25% | $50 |
| 3 | 2 | 1 | 1 | 370 | 50% | $20 |
| 4 | 2 | 2 | 1 | 120 | 50% | $25 |
| 5 | 3 | 1 | 1 | 300 | 30% | $150 |
| 6 | 3 | 1 | 2 | 300 | 30% | $150 |
| 7 | 3 | 1 | 3 | 300 | 30% | $150 |
+----+------------+----------+---------+---------+---------+---------+
Ultimately, I need table A and B joined where both entry num and line num match, but then I need to show each individual row for the inv line number.
For example, entry num 3 / line num 1 will has 3 invoice numbers. All entry num 3/ line num 1 will have the code 300, 30% rate, and $150 amount, but I need to visibly see that there are 3 invoice lines.
I've tried to join tables, group them, and get total counts, but to no avail. Thanks for your help!
I think that you need to create joins between TableA and Table B on EntryNum and LineNum, and then between TableB and TableC on Code. Your SQL should look like:
SELECT A.ID, A.EntryNum, A.LineNum, A.InvLine, B.Code, C.Rate, C.Amt
FROM TableC AS C INNER JOIN (TableB AS B INNER JOIN TableA AS A ON (B.LineNum = A.LineNum) AND (B.EntryNum = A.EntryNum))
ON C.Code = B.Code;
Which produces the result that you want:
Regards,
So I have an accounts table in witch row may or may not have a parent account (0 means it doesn't have a parent):
+----+-----------+
| id | parent_id |
+----+-----------+
| 1 | 2 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
+----+-----------+
I was trying to add the top 3 parents for each row, so I would get something like this:
+----+-----------+----------+----------+----------+
| id | parent_id | parent_1 | parent_2 | parent_3 |
+----+-----------+----------+----------+----------+
| 1 | 2 | 2 | null | null |
| 2 | 0 | null | null | null |
| 3 | 1 | 2 | 1 | null |
| 4 | 3 | 2 | 1 | 3 |
| 5 | 4 | 2 | 1 | 3 |
+----+-----------+----------+----------+----------+
I figured I can do it with recursive queries, but I haven't managed to build a working query.
Any help would be appreciated.
I have a SQL table as following
--------------------------
| REPO | USER | FOLLOWER |
--------------------------
| A | 1 | 3 |
| A | 2 | 4 |
| A | 3 | 6 |
| B | 2 | 7 |
| B | 4 | 2 |
| C | 5 | 3 |
| C | 2 | 6 |
| C | 6 | 5 |
--------------------------
Now, I want to only those rows where USER follows another USER for
same REPO.
i.e. I want rows where elements in FOLLOWER is also in USER for same
REPO.
OUTPUT should be like...
--------------------------
| REPO | USER | FOLLOWER |
--------------------------
| A | 1 | 3 |
| B | 4 | 2 |
| C | 6 | 5 |
| C | 2 | 6 |
--------------------------
Thank You :)
One simple method uses exists:
select t.*
from t
where exists (select 1 from t t2 where t2.repo = t.repo and t2.follower = t.user);
Shouldn't the output actually be as follows, i.e. 4 rows?
--------------------------
| REPO | USER | FOLLOWER |
--------------------------
| A | 1 | 3 |
| B | 4 | 2 |
| C | 6 | 5 |
| C | 2 | 6 |
--------------------------
Consider the following table T
------------------------------
| CountryID | Obs | Event |
------------------------------
| 1 | 1 | 10 |
| 1 | 2 | 20 |
| 1 | 3 | 30 |
| 2 | 1 | 20 |
| 2 | 2 | 30 |
| 2 | 3 | 10 |
| 3 | 1 | 30 |
| 3 | 2 | 10 |
| 3 | 3 | 20 |
------------------------------
I would like to delete all rows such that Event = 20 however I would then like to update the Obs so that they were still in incremental order from 1 with a difference of 1.
For example if I run SELECT * FROM T WHERE Event != 20, I would get
------------------------------
| CountryID | Obs | Event |
------------------------------
| 1 | 1 | 10 |
| 1 | 3 | 30 |
| 2 | 2 | 30 |
| 2 | 3 | 10 |
| 3 | 1 | 30 |
| 3 | 2 | 10 |
------------------------------
but instead I want
------------------------------
| CountryID | Obs | Event |
------------------------------
| 1 | 1 | 10 |
| 1 | 2 | 30 |
| 2 | 1 | 30 |
| 2 | 2 | 10 |
| 3 | 1 | 30 |
| 3 | 2 | 10 |
------------------------------
what query do I need to achieve this?
First, in SQLite, there is a pseudo-column called rowid that uniquely identifies each row. You can do what you want by using a correlated subquery:
update t
set obs = (select count(*)
from t t2
where t2.countryid = t.countryid and t2.rowid <= t.rowid
);
That said, this is quite inefficient and shouldn't be run on anything other than baby tables. If this is an operation that you regularly want to do, you might consider a more powerful database than SQLite.
i have table like this:
| ID | id_number | a | b |
| 1 | 1 | 0 | 215 |
| 2 | 2 | 28 | 8952 |
| 3 | 3 | 10 | 2000 |
| 4 | 1 | 0 | 215 |
| 5 | 1 | 0 |10000 |
| 6 | 3 | 10 | 5000 |
| 7 | 2 | 3 |90933 |
I want to sum a*b where id_number is same, what the query to get all value for every id_number? for example the result is like this :
| ID | id_number | result |
| 1 | 1 | 0 |
| 2 | 2 | 523455 |
| 3 | 3 | 70000 |
This is a simple aggregation query:
select id_number, sum(a*b)
from t
group by id_number
I'm not sure what the first column is for.