Hello I have two databases and each has the same tables. For example I have table called world and it has 4 columns: pkey1, pkey2,companyid, company_name
I made a query which searches for rows which have the same pkey1 and pkey2 but one or many of their other property is different in the 2 tables. My question is how can I see only the different properties?
Here is my query it selects the rows which have the same pkey1 and pkey2 how can I upgrade it to see the columns where there is difference in both databases and of course if there is no difference the result of the query should return NULL in the column here is an example what I want to achieve:
in first database (1,1,345,'Ron'), second database (1,1,377,'Ron') the result should be (1,1,345,null)
Basically to reference data in a different database, you'll need a database link, since you are using PostgreSQL, this documentation should help;
https://www.postgresql.org/docs/current/static/dblink.html
You'll need to use this command to create the link (in this case with a name);
SELECT dblink_connect('CONNECTIONNAME', 'REMOTEDBCONNECTIONSTRING');
Then you can use this new connection via a select query;
SELECT *
FROM dblink('CONNECTIONNAME','SELECT * FROM foo') AS t(a int, b text, c text[]);
And replace 'foo' with your 'world' table name, then change the AS into the variables that relate to pkey1, pkey2,companyid, company_name etc.
If your databases are linked, you can join both tables and with "case" statement check if the value has changed:
select a.pkey1, a.pkey2,
case when a.companyid <> b.companyid then a.companyid else null end as companyid,
case when a.company_name <> b.company_name then a.company_name else null end as company_name
from db1.dbo.world a
inner join db2.dbo.world b on a.pkey1 = b.pkey1 and a.pkey2 = b.pkey2
If you want to omit rows with no difference you can use "except":
select a.pkey1, a.pkey2,
case when a.companyid <> b.companyid then a.companyid else null end as companyid,
case when a.company_name <> b.company_name then a.company_name else null end as company_name
from (
select pkey1, pkey2, companyid, company_name
from db1.dbo.world
except
select pkey1, pkey2, companyid, company_name
from db2.dbo.world) a
inner join db2.dbo.world b on a.pkey1 = b.pkey1 and a.pkey2 = b.pkey2
Related
Let's assume I have a list of company names like so:
CompA
CompB
CompC
How would I go about only returning the names which don't exist in the database.
SELECT * FROM db.companies dc WHERE dc.name NOT IN ('CompA','CompB','CompC')
I have tried using NOT EXISTS and NOT IN but this returns all the company names which are not in the list but present in the database, but I need only the names from the specified list which does not exist.
So for example if CompC was not an existing company it should just return CompC
Make your list of companies into a table, and then query from it.
create temp table tmp_companies (name varchar(100));
insert into tmp_companies
values
('CompA'),
('CompB'),
('CompC');
select *
from tmp_companies c
where not exist (
select 1
from db.companies dc
where dc.name = c.name
)
You could define a CTE with contain all company names which you want to check. Then query from defined CTE.
WITH list_names AS (
SELECT 'CompA' as name
UNION ALL
SELECT 'CompB' as name
UNION ALL
SELECT 'CompC' as name
)
SELECT ln.*
FROM list_names ln
WHERE NOT EXISTS (SELECT 1 FROM db.companies dc WHERE dc.name = ln.name)
Without a temp table, abit more complex and requiring a new line for each name you want to search:
select
case when (select count() from db.companies dc where dc.name = 'CompA') > 0 then 'exists' else 'not found' end CompA,
case when (select count() from db.companies dc where dc.name = 'CompB') > 0 then 'exists' else 'not found' end CompB
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
I am trying to find the available address details from three tables.
When table 1 has the address details then get it from table1
If table 1 address has null value then consider table2,
If table 2 address has null value then consider table3, else display table1 address (null)
There are foreign keys in table 1 which can be used to join table 2 and 3 but they can be null as well in which case only data from table 1 to be considered.
In my query, I am able to join the tables when the foreign keys are available but in case they are null, the query doesn’t work!
I am not sure if I can add a ‘Case’ statement to ignore the ‘Join’ conditions in case the foreign keys are null.
Can someone please assist?
My Query is below :
SELECT donor.donor_num,
CASE
--WHEN donor.addr1 IS NULL THEN paraddress.addr1
--WHEN paraddress.addr1 IS NULL THEN enrparaddr.addr1
WHEN donor.addr1 IS NULL THEN enrparaddr.addr1
ELSE donor.addr1
END AS Address1,
CASE
--WHEN donor.addr2 IS NULL THEN paraddress.addr2
--WHEN paraddress.addr2 IS NULL THEN enrparaddr.addr2
WHEN donor.addr2 IS NULL THEN enrparaddr.addr2
ELSE donor.addr2
END AS Address2
FROM donor
JOIN enrparaddr ON enrparaddr.par_code = donor.enrol_code
--JOIN paraddress ON paraddress.par_code = donor.par_code
WHERE donor_num = '17206'
Please see attached image for the three tables
You can try below - using FULL OUTER JOIN & coalesce() function
SELECT donor.donor_num,
coalesce(donor.addr1,paraddress.addr1,enrparaddr.addr1) AS Address1,
coalesce(donor.addr2,paraddress.addr2,enrparaddr.addr2) AS Address2
FROM donor
FULL OUTER JOIN enrparaddr ON enrparaddr.par_code = donor.enrol_code
FULL OUTER JOIN paraddress ON paraddress.par_code = donor.par_code
WHERE donor_num = '17206'
SELECT donor.donor_num,CASE WHEN donor.addr1 IS NULL
THEN enrparaddr.addr1
ELSE donor.addr1
END AS Address1,
CASE WHEN donor.addr2 IS NULL
THEN enrparaddr.addr2
ELSE donor.addr2
END AS Address2
FROM donor
left join enrparaddr ON enrparaddr.par_code = donor.enrol_code
WHERE donor_num = '17206'
I would recommend:
SELECT d.donor_num,
coalesce(d.addr1, pp.addr1, epe.addr1) AS Address1,
coalesce(d.addr2, pp.addr2, epe.addr2) AS Address2
FROM donor d LEFT JOIN
paraddress pp
ON pp.par_code = d.par_code LEFT JOIN
enrparaddr epe
ON epe.par_code = d.enrol_code AND
pp.par_code IS NULL
WHERE d.donor_num = 17206 -- do not use single quotes for numbers
Notes:
You want a LEFT JOIN because you want all rows in donors.
You should be joining the tables in the order used for the COALESCE().
The second JOIN condition can be limited to cases where the first does not match.
Number constants should not use single quotes.
You can do this with simple Case .. When Statement:
Select Case
When A.ID is NULL And B.ID is NULL And C.ID is NULL Then -- when all columns contain null
NULL
When A.ID is NULL And B.ID is NULL Then
C.ID
When B.ID is NULL and C.ID is NULL Then
A.ID
When A.ID is NULL And C.ID is NULL Then
B.ID
End As ID
From A, B, C
I am not so good at SQL, so I have the following tables
Stuff
and
Specialty
Let's say, the worker with name 'Bob' has two specialties. How could I get the specialty table with an extra column (let's say count) which has 1 if the record exists in Stuff and 0 otherwise.
I would like to ask if there is any way to cast a query
that returns a result for Bob as shown below?
Any suggestions would be very helpful. Thank you in advance.
(I am not sure about the title. Please do suggest if you have a better idea!)
I would be inclined to do this with a case and exists:
select sp.*,
(case when exists (select 1
from stuff s
where s.surname = 'Bob' and
s.speciality_code = sp.speciality_code
)
then 1 else 0
end) as BobHas
from specialty sp;
Use Left Outer join with Null check. Try this.
SELECT sp.specialitycode,
sp.description,
CASE
WHEN st.specialitycode IS NULL THEN 0
ELSE 1
END AS count
FROM speciality sp
LEFT OUTER JOIN (SELECT specialitycode
FROM stuff
WHERE surname = 'Bob') st
ON sp.specialitycode = st.specialitycode
I know something must be wrong with my syntax but I can't seem to figure it out.
I want to populate this column prop_and_cas_dtl_prdct_desc from either expir_prop_and_cas_dtl_prdct_cd or ren_prop_and_cas_dtl_prdct_cd depending on the value in type_indicator but before it goes into prop_and_cas_dtl_prdct_desc it should look up the prop_and_cas_dtl_prdct_desc from pc_ref_detail_product_cd and select the one corresponding to its expir_prop_and_cas_dtl_prdct_cd or ren_prop_and_cas_dtl_prdct_cd.
I apologize for the terrible indenting, I know it is difficult to read but this is the best way I know how to put it.
select
,ren_prop_and_cas_dtl_prdct_cd
...
,p_and_c_cd
,case when type_indicator in ('R','C') then
select prop_and_cas_dtl_prdct_desc
from pc_ref_detail_product_cd a inner join op_pif_coverage_rpc_new b
on a.prop_and_cas_dtl_prdct_cd = b.expir_prop_and_cas_dtl_prdct_cd
else when type_indicator in ('N','O') then
select prop_and_cas_dtl_prdct_desc
from pc_ref_detail_product_cd a inner join op_pif_coverage_rpc_new b
on a.prop_and_cas_dtl_prdct_cd = b.ren_prop_and_cas_dtl_prdct_cd
else NULL
END
AS prop_and_cas_dtl_prdct_desc
FROM dbo.op_pif_coverage_rpc_new
Here is the code I used to create my reference table
create table pc_ref_detail_product_cd(
prop_and_cas_dtl_prdct_cd char(2),
prop_and_cas_dtl_prdct_desc char(30)
)
insert into pc_ref_detail_product_cd (prop_and_cas_dtl_prdct_cd, prop_and_cas_dtl_prdct_desc)
values ('01', 'CORE'),
('02', 'FORECLOSED'),
('04', 'TRUST'),
('06', 'MORTGAGE HOLDERS E&O'),
('07', 'SECURITY INTEREST E&O')
If you need to select column from different table depending on value in additional column you need to include all tables in query, with appropriate JOIN and than use case statement like so
SELECT CASE WHEN a.MyColumn = 0 THEN b.SomeColumn
WHEN a.MyColumn = 1 THEN a.SomeColumn
END AS SomeColumn
FROM MyTableA AS a
JOIN MyTableB AS b
ON a.ID = b.ID
Instead of select statement in case statement, you just going to select column from ether table that you need for each particular case.
I got it figured out. Here is the SQL I used. Sorry if it wasn't apparent what I wanted to do from my horrible code in the original question.
select
,ren_prop_and_cas_dtl_prdct_cd
...
,p_and_c_cd
,case when type_indicator in ('R','C') then
(select prop_and_cas_dtl_prdct_desc
from pc_ref_detail_product_cd a where expir_prop_and_cas_dtl_prdct_cd = prop_and_cas_dtl_prdct_cd)
when type_indicator in ('N','O') then
(select prop_and_cas_dtl_prdct_desc
prop_and_cas_dtl_prdct_desc
from pc_ref_detail_product_cd a where ren_prop_and_cas_dtl_prdct_cd = prop_and_cas_dtl_prdct_cd)
else NULL
END
AS prop_and_cas_dtl_prdct_desc
FROM dbo.op_pif_coverage_rpc_new