I have written a query in which I want to show the order of employees as per written in the query. Query is as follow
select * from employeemaster where employeename in
('Sachin','Gaurav','Vinay','Shiv','Sandeep','Vaibhav','Prashant')
I want to see the query result dislpaying Sachin first then the others and in this case the ID's of the employees is not in sequence, ex. Sachin's ID can be 4 and Vinay's ID can be 1. But as I have written Sachin in first place, then I want to see Sachin starting first in the result.
You can use a CTE with IDs to do the sorting and the filtering with an inner join.
WITH cte as (
SELECT *
FROM (VALUES
(1,'Sachin')
,(2,'Gaurav')
,(3,'Vinay')
,(4,'Shiv')
,(5,'Sandeep')
,(6,'Vaibhav')
,(7,'Prashant')
) a (id, [name])
)
SELECT em.*
FROM employeemaster em
JOIN cte
ON em.employeename = cte.[name]
ORDER BY cte.id
select * from employeemaster
join (values
('Sachin',1)
,('Gaurav',2)
,('Vinay',3)
,('Shiv',4)
,('Sandeep',5)
,('Vaibhav',6)
,('Prashant',7)) a(employeename ,_order) on a.employeename = employeemaster.employeename
order by a.[_order]
Related
I'm trying to create a recursive CTE that traverses all the records for a given ID, and does some operations between ordered records. Let's say I have customers at a bank who get charged a uniquely identifiable fee, and a customer can pay that fee in any number of installments:
WITH recursive payments (
id
, index
, fees_paid
, fees_owed
)
AS (
SELECT id
, index
, fees_paid
, fee_charged
FROM table
WHERE index = 1
UNION ALL
SELECT t.id
, t.index
, t.fees_paid
, p.fees_owed - p.fees_paid
FROM table t
JOIN payments p
ON t.id = p.id
AND t.index = p.index + 1
)
SELECT *
FROM payments
ORDER BY 1,2;
The join logic seems sound, but when I join the output of this query to the source table, I'm getting non-deterministic and incorrect results.
This is my first foray into Snowflake's recursive CTEs. What am I missing in the intermediate result logic that is leading to the non-determinism here?
I assume this is edited code, because in the anchor of you CTE you select the fourth column fee_charged which does not exist, and then in the recursion you don't sum the fees paid and other stuff, basically you logic seems rather strange.
So creating some random data, that has two different id streams to recurse over:
create or replace table data (id number, index number, val text);
insert into data
select * from values (1,1,'a'),(2,1,'b')
,(1,2,'c'), (2,2,'d')
,(1,3,'e'), (2,3,'f')
v(id, index, val);
Now altering you CTE just a little bit to concat that strings together..
WITH RECURSIVE payments AS
(
SELECT id
, index
, val
FROM data
WHERE index = 1
UNION ALL
SELECT t.id
, t.index
, p.val || t.val as val
FROM data t
JOIN payments p
ON t.id = p.id
AND t.index = p.index + 1
)
SELECT *
FROM payments
ORDER BY 1,2;
we get:
ID INDEX VAL
1 1 a
1 2 ac
1 3 ace
2 1 b
2 2 bd
2 3 bdf
Which is exactly as I would expect. So how this relates to your "it gets strange when I join to other stuff" is ether, your output of you CTE is not how you expect it to be.. Or your join to other stuff is not working as you expect, Or there is a bug with snowflake.
Which all comes down to, if the CTE results are exactly what you expect, create a table and join that to your other table, so eliminate some form of CTE vs JOIN bug, and to debug why your join is not working.
But if your CTE output is not what you expect, then lets help debug that.
I have a table with data that i need to retrieve for each id and its corresponding month
every id has a specific month in which i need to use as a condition to select the records from my table. I would like to know if there is another way of me achieving this instead of having where in () with all the values , my sample is just a small snippet of the actuality data size
Is there any other way I can do this?
please may you reopen the question, i have edited it
You dont have to do one by one. You can use IN operator with the list of ids.
SELECT * FROM YourTable WHERE ID IN (1,2,3....)
If you need to compare more than one column, then define table for combination.
;WITH CTE_IDMonthCombination AS
(
SELECT *
FROM
(
VALUES
(100,1),
(101,2)
.
.
) AS t(ID, Month)
)
SELECT * FROM YourTable AS u
INNER JOIN CTE_IDMonthCombination AS c
ON c.ID = u.ID AND c.Month = u.Month;
GO
Or you can use TempTable, as you have mentioned in the comments.
SELECT *
INTO #t
FROM
(
VALUES
(100,1),
(101,2)
.
.
) AS t(ID, Month);
GO
SELECT * FROM YourTable AS u
INNER JOIN #t AS c
ON c.ID = u.ID AND c.Month = u.Month;
GO
Based on the sql result above i want to divide the result like the image below
I tried using case it return duplicate data.
Anyone have done this or have any idea how to do this?
Can you try this one?
SELECT t1.*,t2.* from yourtable WHERE t1.hatch_num_1 != t2.hatch_num_1
JOIN yourtable t2 ON t1.delay_code_1=t2.delay_code_1
Afterwards you can mention exactly what columns you wan't from both t1 and t2 and mention with 'as' how do you wan't them to be named in your select statement, so instead of having 2 hatch_num_1 you wil have one with _1 and one with _3
;With
a As (SELECT * FROM yourtable X Where X.hatch= 'H1' ),
b AS (SELECT * FROM yourtable Y Where Y.hatch= 'H3')
SELECT A.* ,B.* FROM A , B WHERE A.[delay] = B.[delay]
If you have limited hatches and same time that are repeating then you can do it like this or show me some more records or details then i'll came to know...
I'm stuck with a query which should be pretty simple but, for reasons unknown, my brain is not playing ball here ...
Table:
id(int) | strategy (varchar) | value (whatever)
1 "ABC" whatevs
2 "ABC" yeah
3 "DEF" hello
4 "DEF" kitty
5 "QQQ" hurrr
The query should select ALL rows grouped on strategy but only one row per strategy - the one with the higest id.
In the case above, it should return rows with id 2, 4 and 5
SELECT id, strategy , value
FROM (
SELECT id, strategy , value
,ROW_NUMBER() OVER (PARTITION BY strategy ORDER BY ID DESC) rn
FROM Table_Name
) Sub
WHERE rn = 1
Working SQL FIDDLE
You can use window function to get the solution you want. Fiddle here
with cte as
(
select
rank()over(partition by strategy order by id desc) as rnk,
id, strategy, value from myT
)
select id, strategy, value from
cte where rnk = 1;
Try this:
SELECT T2.id,T1.strategy,T1.value
FROM TableName T1
INNER JOIN
(SELECT MAX(id) as id,strategy
FROM TableName
GROUP BY strategy) T2
ON T1.id=T2.id
Result:
ID STRATEGY VALUE
2 ABC yeah
4 DEF kitty
5 QQQ hurrr
See result in SQL Fiddle.
SELECT id, strategy , value
FROM (
SELECT id, strategy , value
,MAX(id) OVER (PARTITION BY strategy) MaxId
FROM YourTable
) Sub
WHERE id=MaxId
You may try this one as well:
SELECT id, strategy, value FROM TableName WHERE id IN (
SELECT MAX(id) FROM TableName GROUP BY strategy
)
Bit depends on your data, you might get results faster with it as it does not do sorting, but by the other hand it uses IN, which can slow you down if there is many 'strategies'
I run the following query
Select * From
(
Select
GUID,
MFG_CODE,
STK_NAME,
parentid,
masteritem,
ROW_NUMBER() over(order by guid) r
From Fstock Where MasterItem=1 OR isNull(parentID, '')=''
) a
Where r between 4716 And 4716
And I get following results
GUID MFG_CODE parentid masteritem r
31955 369553 0 1 4717
As you can see GUID 31955 is actually a parentITEM & I need to bring in all the children of this parent item within the same query.
For example if I do:
Select * From Fstock where parentID = 31955
It returns 3 children of it
GUID
31956
31957
31958
So is there a way to combine these two queries together, I only want to return fixed amount of rows using row_number() function, however those returned rows sometimes contain a Parent ITem, I would like to return the children for those parent items as well within same query.
Performance is very important for me.
--- EDIT ----
I got it to work with following query, does anyone have other ideas?
With CTE
As
(
Select
GUID,
Manufacturer,
SELL_PRICE,
MFG_CODE,
parentid,
masteritem,
ROW_NUMBER() over(order by GUID) r
From Fstock Where MasterItem=1 OR isNull(parentID, '')=''
)
Select A.*,F.parentID From
(
Select * From CTE
Where r between 4717 And 6000
) A
Left join Fstock F on F.parentID = A.GUID
Order by A.r
This is crude and untested, but I believe you're looking for a recursive Common Table Expression (CTE) that will combine the parent-child relationships for you. Now, natively, this does not integrate any row limitations you mentioned in terms of returning a "fixed number of rows," which I was not precisely sure how to interpret, but the basic query below should be a start for you.
With Products(GUID, MFG_CODE,STK_NAME, parentid,masteritem)
as
(
Select GUID,MFG_CODE,STK_NAME,parentid,masteritem
from fstock
where masteritem=1 OR isNull(parentID, '')=''
Union all
Select f.GUID,f.MFG_CODE,f.STK_NAME,f.parentid,f.masteritem
from fstock f
inner join products g
on f.parentid=g.guid
)