I want to change this query:
select
t.AccountA
,t.AccountB
,t.totalNumber
,a.Category
from TableA t
left join Accounts a
on t.ActNum = a.ActNum
left join
(select distinct
s.col1
from (
select ....
from Table
group by...
) st
left join (select S....
group by..
) g on...
left join (select... on ...
) t on ...
where...
)
so that c.AccountB displays "X" if it was a "Y". So I want to do something like
CASE WHEN c.AccountB = 'Y' THEN 'X' ELSE 'c.AccountB END
Except I'm having a problem where some data (a.Category) is coming from the table a, and table a doesn't have a record in it equal to "Y", so the join doesn't get the category data from a. That field is therefore blank. I'm trying to avoid adding it to that table and would rather change the query. How can I do this? What I think would work is:
select
t.AccountA
,t.AccountB
,t.totalNumber
,a.Category
from TableA t
left join ****** (Select CASE WHEN t.AccountB = 'Y' THEN 'X' ELSE 't.AccountB END Accounts a)
on t.ActNum = a.ActNum
left join
(select distinct
col1
from (
select ....
from Table
group by...
) sta
left join (select S....
group by..
) g on...
left join (select... on ...
) t on ...
where...
)
Where I put the CASE expression in the 7th line here by the asterisks ***
Will this return exactly the same records? This is a really long running query and difficult to test so I'm trying to run it as few times as possible, would like some input to help me so this doesn't turn into a 6 hour project.
EDIT: I had a typo, the first columns selected were supposed to reference the first table - I changed it (table "t")
First, this might be as simple as getting rid of the single quote before c.AccountB CASE WHEN c.AccountB = 'Y' THEN 'X' ELSE c.AccountB END Otherwise I'm not quite sure I understand what you want but I'll try:
If you just want to select then:
select
c.AccountA
,CASE WHEN c.AccountB = 'Y' THEN 'X' ELSE c.AccountB END AccountB
,totalNumber
,a.Category
from TableA t
left join Accounts a
on t.ActNum = a.ActNum
left join
...
If instead you want to use this as part of a join you'll have to use it in your join. Since you don't show how "c" is joined, nor how "c" and "a" are related I will try to give an example:
select
c.AccountA
,CASE WHEN c.AccountB = 'Y' THEN 'X' ELSE c.AccountB END AccountB
,totalNumber
,a.Category
from CheckRegister c
left join Accounts a
on a.ActNum = c.AccountA
left join Accounts b
on b.ActNum = CASE WHEN c.AccountB = 'Y' THEN 'X' ELSE c.AccountB END
Related
I have 2 tables; the first one ORG contains the following columns:
ORG_REF, ARB_REF, NAME, LEVEL, START_DATE
and the second one WORK contains these columns:
ARB_REF, WORK_STREET - WORK_NUM, WORK_ZIP
I want to do the following: write a select query that search in work and see if the WORK_STREET, WORK_ZIP are duplicate together, then you should look at WORK_NUM. If it is the same then output value ' ok ', but if WORK_NUM is not the same, output 'not ok'
I wrote this SQL query:
select
A.ARB_REF, A.WORK_STREET, A.WORK_NUM, A.WORK_ZIP
case when B.B = 1 then 'OK' else 'not ok' end
from
work A
join
(select
WORK_STREET, WORK_ZIP count(distinct , A.WORK_NUM) B
from
WORK
group by
WORK_STREET, WORK_ZIP) B on B.WORK_STREET = A.WORK_STREET
and B.WORK_ZIP = A.WORK_ZIP
Now I want to join the table ORG with this result I want to check if every address belong to org if it belong I should create a new column result and set it to yes in it (RESULT) AND show the "name" column otherwise set no in 'RESULT'.
Can anyone help me please?
While you can accomplish your result by adding a left outer join to the query you've already started, it might be easiest to just use count() over....
with org_data as (
-- do the inner join before the left join later
select * from org1 o1 inner join org2 o2 on o2.orgid = o1.orgid
)
select
*,
count(*) over (partition by WORK_STREET, WORKZIP) as cnt,
case when o.ARB_REF is not null then 'Yes' else 'No' end as result
from
WORK w left outer join org_data o on o.ARB_REF = w.ARB_REF
Imagine I have this data
people -> address changes -> address change reasons
I want details of all people
I also want to know if they have ever changed address because of fire. So I don't want to know what the reasons are but if they have changed address for 1 single reason.
Each person could possibly have multiple address change reasons
so I have
SELECT people.*
CASE WHEN add_change.reason_id is not NULL THEN
'Y'
ELSE
'N'
END as been_fire
from people
left outer join add_change ON person.id = add_change.person
left outer join add_change_reason ON add_change.reason_id = add_change_reason.id AND add_change_reason.text = 'FIRE'
but this returns multiple rows per person if they have many address changes.
I can't just use
left outer join add_change ON add_change.person = person.id AND add_change.reason_id = 5
as this isn't fixed data.
Use exists:
SELECT p.*,
(CASE WHEN EXISTS (SELECT 1
FROM add_change ac JOIN
add_change_reason acr
ON ac.reason_id = acr.id
NVL(address_change.reason,'N')
WHERE p.id = ac.person AND
acr.text = 'FIRE'
)
THEN 'Y' ELSE 'N'
END) as has_fire_address_change
from people p;
Note that this changes the flag to 'Y' and 'N', which is what the description of your problem suggests that you want.
You could do a left join to a derived table that only returns person IDs that do have the change reason 'FIRE':
SELECT p.*
CASE WHEN cr.person IS NOT NULL THEN 'Y' ELSE 'N' END as been_fire
from people
left join (
select ac.person
from add_change ac
where exists (select *
from add_change_reason acr
where acr.id = ac.reason_id
AND acr.text = 'FIRE')
) cr on cr.person = p.id
Having a slow day....could use some assistance writing a simple ANSI SQL query.
I have a list of individuals within families (first and last names), and a second table which lists a subset of those individuals. I would like to create a third table which flags every individual within a family if ANY of the individuals are not listed in the second table. The goal is essentially to flag "incomplete" families.
Below is an example of the two input tables, and the desired third table.
As I said...very simple...having a slow day. Thanks!
I think you want a left join and case expression:
select t1.*,
(case when t2.first_name is null then 'INCOMPLETE' else 'OK' end) as flag
from table1 t1 left join
table2 t2
on t1.first_name = t2.first_name and t1.last_name = t2.last_name;
Of course, this marks "Diane Thomson" as "OK", but I think that is an error in the question.
EDIT:
Oh, I see. The last name defines the family (that seems like a pretty big assumption). But you can do this with window functions:
select t1.*,
(case when count(t2.first_name) over (partition by t1.last_name) =
count(*) over (partition by t1.last_name)
then 'OK'
else 'INCOMPLETE'
end) as flag
from table1 t1 left join
table2 t2
on t1.first_name = t2.first_name and t1.last_name = t2.last_name;
That's not simple, at least not in SAS :-)
Standard SQL, when Windowed Aggregates are supported:
select ft.*,
-- counts differ when st.first_name is null due to the outer join
case when count(*) over (partition by ft.last_name)
= count(st.first_name) over (partition by ft.last_name)
then 'OK'
else 'INCOMPLETE'
end
from first_table as ft
left join second_table as st
on ft.first_name = st.first_name
and ft.last_name = ft.last_name
Otherwise you need to a standard aggregate and join back:
select ft.*, st.flag
from first_table as ft
join
(
select ft.last_name,
case when count(*)
= count(st.first_name)
then 'OK'
else 'INCOMPLETE'
end as flag
from first_table as ft
left join second_table as st
on ft.first_name = st.first_name
and ft.last_name = st.last_name
group by ft.last_name
) as st
on ft.last_name = st.last_name
It is pretty easy to do in SAS if you want to take advantage of its non-ANSI SQL feature of automatically re-merging aggregate function results back onto detail records.
select
a.first
, a.last
, case when 1=max(missing(b.last)) then 'INCOMPLETE'
else 'OK'
end as flag
from table1 a left join table2 b
on a.last=b.last and a.first=b.first
group by 2
order by 2,1
;
I have used a left join on two of my tables. Now I want to use case to identify the records from my left table who don't have a match in the right table. Such records exist and have a null value in the 'id_zeus' column of my join, however when I execute the case, it is as these fields don't exist. Where am I going wrong ? I get "Present" in all my column Disturbance. I am using Oracle SQL developer.
SELECT
CASE DP.ID_PRB
WHEN NULL
THEN 'Absence'
ELSE 'Present' END as Disturbance,
FROM
FIRE.WSITE WI
LEFT JOIN
(SELECT DISTINCT
DPL.ID_PERT as ID_PRB
FROM FIRE.DEPPLAN DPL
GROUP BY DPL.ID_PERT
) DPL
ON WI.ID_PERT = DP.ID_PERT
What is const? You don't seem to need it. The SELECT DISTINCT and GROUP BY are redundant, so use only one of them. And your alias on the subquery is incorrect.
But your problem is the comparison to NULL. It doesn't even match when doing a comparison as you are doing in CASE. You need to use IS NULL:
SELECT (CASE WHEN DP.ID_PRB IS NULL THEN 'Absence' ELSE 'Present'
END) as Disturbance,
FROM FIRE.WSITE WI LEFT JOIN
(SELECT DISTINCT DPL.ID_PERT as ID_PRB
FROM FIRE.OSI_DEVIATION_PLANS DP
) DP
ON WI.ID_PERT = DP.ID_PERT;
This query would commonly be written as:
SELECT (CASE WHEN NOT EXISTS (SELECT 1
FROM FIRE.OSI_DEVIATION_PLANS DP
WHERE WI.ID_PERT = DP.ID_PERT
)
THEN 'Absence' ELSE 'Present'
END) as Disturbance,
FROM FIRE.WSITE WI ;
This offers more opportunities for optimization.
Is it possible to pull values from 2 different tables based on the value of a column? For example, I have a table with a boolean column that either returns 0 or 1 depending on what the end user selects in our program. 0 means that I should pull in the default values. 1 means to use the user's data.
If my table Table1 looked like this:
Case ID Boolean
====================
1 0
2 1
3 1
4 0
5 0
Then I would need to pull Case IDs 1,4,and 5's corresponding data from table Default and Case IDs 3 and 4's corresponding data from table UserDef. Then I would have to take these values, combine them, and reorder them by Case ID so I can preserve the order in the resulting table.
I am fairly inexperienced with SQL but I am trying to learn. Any help or suggestions are greatly appreciated. Thank you in advance for your help.
Something like this:
SELECT
t1.CaseID
,CASE WHEN t1.Boolean = 1 THEN dt.Col1 ELSE ut.Col1 END AS Col1
,CASE WHEN t1.Boolean = 1 THEN dt.Col2 ELSE ut.Col2 END AS Col2
FROM Table1 t1
LEFT JOIN DefaultTable dt ON dt.CaseID = t1.CaseID
LEFT JOIN UserDefTable ut ON ut.CaseID = t1.CaseID
ORDER BY t1.CaseID
You join on both tables and then use CASE in SELECT to choose from which one to display data.
Option B:
WITH CTE_Combo AS
(
SELECT 0 as Boolean, * FROM Default --replace * with needed columns
UNION ALL
SELECT 1 AS Boolean, * FROM UserDef --replace * with needed columns
)
SELECT * FROM Table1 t
LEFT JOIN CTE_Combo c ON t.CaseID = c.CaseID AND t.Boolean = c.Boolean
ORDER BY t.CaseID
This might be even simpler - using CTE make a union of both tables adding artificial column, and then join CTE and your Table using both ID and flag column.
SELECT t1.CaseID,
ISNULL(td.data, tu.data) userData -- pick data from table_default
-- if not null else from table_user
FROM table1 t1
LEFT JOIN table_default td ON t1.CaseID = td.CaseID -- left join with table_default
AND t1.Boolean = 0 -- when boolean = 0
LEFT JOIN table_user tu ON t1.CaseID = tu.CaseID -- left join with table_user
AND t1.Boolean = 1 -- when boolean = 1
ORDER BY t1.CaseID