I have a table that represents the parameters of a contract - including their change over time through addendums. The first addendum is a "special" addendum representing the parameters when the contract was first signed.
Here's how the table should look like:
ID ProjectID BeginDate DeadlineMonths DeadlineDate
1 20 20-12-2006 24 <computed= 20-12-2006 + 24 months>
2 23 12-03-2007 12 <computed= 12-03-2007 + 12 months>
3 20 06-09-2007 36 <computed= **20-12-2006** + 36 months>
ProjectID is a FK to the Projects table whose primary key is also called ProjectID.
I want DeadlineDate to be a calculated field, calculated like so:
DeadlineDate COMPUTE BY ((
select first 1 AddMonth(contract.BeginDate, DeadlineMonths)
from addendums contract
where contract.projectid = projectid
order by contract.BeginDate ))
The problem is that in contract.projectid = projectid the second ProjectID has to reference the current row being computed, not the current row in the select statement (which is the same as contract.projectid).
I'm using Firebird. I need the column in the table and NOT in a SELECT statement because of ORM issues in the application using the database.
Just prefix the field with table name of the current table:
DeadlineDate COMPUTED BY ((
select first 1 AddMonth(contract.BeginDate, DeadlineMonths)
from addendums contract
where contract.projectid = projects.projectid
order by contract.BeginDate ))
Can you create a view over your query and use it in the ORM?
CREATE VIEW v_addendums
AS
SELECT ID, ProjectID, BeginDate, DeadlineMonths,
(
SELECT first 1 AddMonth(contract.BeginDate, DeadlineMonths)
FROM addendums contract
WHERE contract.projectid = a.projectid
ORDER BY
contract.BeginDate
)
FROM addendums a
Related
I hope my title is ok as I really don’t know how to call it.
Anyway, I have a table with the following :
ID - Num (Primary Key)
Category - VarChar
Name - VarChar
DateForName - Date
Data looks like that :
1 100 111 31/12/2017
2 101 210 30/12/2017
3 100 112 29/12/2017
4 101 203 27/12/2017
5 100 117 20/12/2017
6 103 425 08/12/2017
To generate this table, I just sorted by date DESC.
Is there a way to add a new column with the order per Category like :
1 100|1
2 101|1
3 100|2
4 101|2
5 100|3
6 103|1
Max
You want analytical function row_number():
select t.*
from (select *, row_number() over (partition by Category order by date desc) Seq
from table
) t
order by id;
Yes, SQL has a couple options for you to add a column that is populated with a ranking of the rows based on the category and id columns.
If you just want to add a column to the select statement, I recommend using the RANK() function.
See more details here:
https://learn.microsoft.com/en-us/sql/t-sql/functions/rank-transact-sql?view=sql-server-2017
For your current table, try the following select statement:
SELECT
[ID],
[Category],
[Name],
[DateForName],
RANK() OVER (PARTITION BY [Category] ORDER BY [DateForName] DESC) AS [CategoryOrder]
FROM [TableName]
Alternatively, if you want to add a permanent column (aka a field) to the existing table, I recommend treating this as a calculated column. See more information here:
https://learn.microsoft.com/en-us/sql/relational-databases/tables/specify-computed-columns-in-a-table?view=sql-server-2017
Because the new column would be completely based on two pre-existing columns and only those two columns. SQL can do a great job maintaining this for you.
Hope this helps!
I have a table named Vendor, within this table I have a column called AccountTerms which is shows only a value (i.e. 0, 1, 2, 3) and so on. I also have a column that I want to use (ulARAgeing) in order to reflect the meaning of that value, such as:
0: Current
1: 30 Days
2: 60 Days
and so on...
What I need is a script that will look at the value in AccountTerms and will then update ulARAgeing to show the word value shown above. How do I do this?
I am going to try to explain this in a simple manner as much as possible so it's easy to understand :
Let's assume, you have a table Vendor setup something like this:
create table Vendor (AccountTerms int, ulARAgeing varchar(50));
And, then we will insert some sample values for both columns in Vendor table:
insert into Vendor values
(0,'Test'),
(1,'Test1'),
(2,'Test2');
Next, we will write an update statement to update your ulARAgeing column based on the values in AccountTerms column in the same table:
update vendor
set ulARAgeing = (CASE
WHEN AccountTerms = 0
THEN 'Current'
WHEN AccountTerms = 1
THEN '30 Days'
WHEN AccountTerms = 2
THEN '60 Days'
END);
CASE WHEN is similar to using IF..ELSE statement in most other programming languages. So, here we will be updating the existing ulARAgeing value to different string value based on the condition in the case when statement. So, for e.g. if the AccountTerms = 0 then we will update the value for ulARAgeing to `Current' and so forth.
To check if the above statement worked correctly, you just need to run the update statement above and then select from the table again:
select * from Vendor;
Result:
+--------------+-----------------+
| AccountTerms | ulARAgeing |
+--------------+-----------------+
| 0 | Current |
| 1 | 30 Days |
| 2 | 60 Days |
+--------------+-----------------+
SQL Fiddle Demo
Assuming you want a simple script to update, then it would be like this:
update
Vendor
set ulARAgeing = 'Current'
where AccountTerms = 0;
Assuming you want a script where it automatically update the column from a logic of numeric progression. Then it would be like this:
;WITH CTE
AS (select
AccountTerms
,ulARAgeing
,CONCAT((AccountTerms * 30), ' Days') as _ulARAgeing
from
Vendor)
UPDATE CTE
SET ulARAgeing = _ulARAgeing;
If by chance the value of "ulARAgeing" come from another table, then the script using "; WITH", you must use a join to get the correct value, instead of using a logic of progression.
this is a sample sql query that i created ms access query. i am trying to get only one row the min(DATE). how ever when i run my query i get multiple lines. any hits? thanks
SELECT tblWarehouseItem.whiItemName,
tblWarehouseItem.whiQty,
tblWarehouseItem.whiPrice,
Min(tblWarehouseItem.whiDateIn) AS MinOfwhiDateIn,
tblWarehouseItem.whiExpiryDate,
tblWarehouseItem.whiwrhID
FROM tblWarehouseItem
GROUP BY tblWarehouseItem.whiDateIn,
tblWarehouseItem.whiItemName,
tblWarehouseItem.whiQty,
tblWarehouseItem.whiPrice,
tblWarehouseItem.whiExpiryDate,
tblWarehouseItem.whiwrhID;
If i have my sql code like that is working as it should:
SELECT MIN(tblWarehouseItem.whiDateIn) FROM tblWarehouseItem;
In the first query, you group by a number of columns. That means the minimum value will be calculated for each group, which in turn means you may have multiple rows. On the other hand, the second query will only get the minimum value for the specified column from all rows, so that there is only one row in the result set.
A simple example is shown below to illustrate the above.
Table:
Key Value
1 1
1 2
2 3
2 4
On Group By Key:
GroupKey MinValue
1 = min(1,2) = 1 -> Row 1
2 = min(3,4) = 3 -> Row 2
On Min (Value)
MinValue
=min(1,2,3,4) = 1 -> Row 1
For a table like above, if you want to select all rows and also show the minimum value from whole table rather than per group, you can do something like this:
select key, (select min(value) from table)
from table
SELECT WI.*
FROM tblWarehouseItem AS WI INNER JOIN (SELECT whiimtID, MIN(tblWarehouseItem.whiDateIn) AS whiDateIn
FROM tblWarehouseItem
GROUP BY whiimtID) AS MinWI ON (WI.whiDateIn = MinWI.whiDateIn) AND (WI.whiimtID = MinWI.whiimtID);
I have a table that looks like this:
Column A | Column B | Counter
---------------------------------------------
A | B | 53
B | C | 23
A | D | 11
C | B | 22
I need to remove the last row because it's cyclic to the second row. Can't seem to figure out how to do it.
EDIT
There is an indexed date field. This is for Sankey diagram. The data in the sample table is actually the result of a query. The underlying table has:
date | source node | target node | path count
The query to build the table is:
SELECT source_node, target_node, COUNT(1)
FROM sankey_table
WHERE TO_CHAR(data_date, 'yyyy-mm-dd')='2013-08-19'
GROUP BY source_node, target_node
In the sample, the last row C to B is going backwards and I need to ignore it or the Sankey won't display. I need to only show forward path.
Removing all edges from your graph where the tuple (source_node, target_node) is not ordered alphabetically and the symmetric row exists should give you what you want:
DELETE
FROM sankey_table t1
WHERE source_node > target_node
AND EXISTS (
SELECT NULL from sankey_table t2
WHERE t2.source_node = t1.target_node
AND t2.target_node = t1.source_node)
If you don't want to DELETE them, just use this WHERE clause in your query for generating the input for the diagram.
If you can adjust how your table is populated, you can change the query you're using to only retrieve the values for the first direction (for that date) in the first place, with a little bit an analytic manipulation:
SELECT source_node, target_node, counter FROM (
SELECT source_node,
target_node,
COUNT(*) OVER (PARTITION BY source_node, target_node) AS counter,
RANK () OVER (PARTITION BY GREATEST(source_node, target_node),
LEAST(source_node, target_node), TRUNC(data_date)
ORDER BY data_date) AS rnk
FROM sankey_table
WHERE TO_CHAR(data_date, 'yyyy-mm-dd')='2013-08-19'
)
WHERE rnk = 1;
The inner query gets the same data you collect now but adds a ranking column, which will be 1 for the first row for any source/target pair in any order for a given day. The outer query then just ignores everything else.
This might be a candidate for a materialised view if you're truncating and repopulating it daily.
If you can't change your intermediate table but can still see the underlying table you could join back to it using the same kind of idea; assuming the table you're querying from is called sankey_agg_table:
SELECT sat.source_node, sat.target_node, sat.counter
FROM sankey_agg_table sat
JOIN (SELECT source_node, target_node,
RANK () OVER (PARTITION BY GREATEST(source_node, target_node),
LEAST(source_node, target_node), TRUNC(data_date)
ORDER BY data_date) AS rnk
FROM sankey_table) st
ON st.source_node = sat.source_node
AND st.target_node = sat.target_node
AND st.rnk = 1;
SQL Fiddle demos.
DELETE FROM yourTable
where [Column A]='C'
given that these are all your rows
EDIT
I would recommend that you clean up your source data if you can, i.e. delete the rows that you call backwards, if those rows are incorrect as you state in your comments.
I am stuck with this problem.
I have duplicates in my query coming from that some of the records are in-house and outside simultaneously. I prefer in-house over outside but some of the outside are preferable when there is no entrance from in-house.
Select id, date, location from prod
id date location
----------
2 01/01/2012 in-house
2 05/01/2012 outside <- in this situation i want to keep just in-house
id date location
----------
4 01/01/2012 in-house
5 03/01/2012 outside <- in this situation i want to keep both since there is no db entry for id=5 therefor i have just info from outside
Could someone help?
One way to do this is to do a full outer join from your table to itself and then use coalesce.
Select
COALESCE(Inside.Id, outside.id) Id,
COALESCE(Inside.date, outside.date) Date,
COALESCE(Inside.location, outside.location) Location
From
prod Inside
FULL OUTER JOIN prod Outside
ON Inside.id = Outside.iD
and Inside.location <> Outside.Location
Where
(Inside.Location = 'in-house'
or
Inside.Location is null)
and
(outside.Location = 'outside'
or
outside.Location is null)
DEMO
Notes:
If your fields can be nullable you may want to use a Case statement instead of coalesce and use the ID field to determine which table to use. Using the date as an example
CASE WHEN Inside.Id is not null THEN Inside.date ELSE outside.date END date
As Dems noted this also assumes that {id, location} is unique.
UPDATE
Since you're using SQL Server and {ID, Location} isn't unique and you want the max date value and always choosing in-house over outside then you can use ROW_NUMBER/WHERE RowNumber = 1 effectively here, by ordering First on location and then by date.
WITH cte
AS (SELECT Row_number() OVER ( partition BY ID
ORDER BY CASE LOCATION WHEN 'in-house' THEN 0
WHEN 'outside' THEN 1 END,
DATE DESC) rn,
ID,
Date,
Location
FROM prod)
SELECT ID,
Date,
Location
FROM cte
WHERE rn = 1
Demo
Note We didn't have to use a case statement but I wanted the mapping to be explicit.