SQL Inner Join on Select Statements

INNER JOIN vs INNER JOIN (SELECT . FROM)

You are correct. You did exactly the right thing, checking the query plan rather than trying to second-guess the optimiser. :-)

Inner joining to a select statement where the inner select statement's where clause references the outer select?

Looks like you have your JOIN reference in the wrong place.

SELECT S.Item, S.SerialNum, S.ReceiveDate
FROM SALES S
INNER JOIN
(
SELECT W.Item, W.SerialNum, MIN(W.SalesDate) MinSalesDate
FROM WARRANTY W
GROUP BY Item, SerialNum
) WW
ON S.Item = WW.Item
AND S.SerialNum = WW.SerialNum

Edit, based on your comment about filtering, you can place a WHERE clause on your inner SELECT:

SELECT S.Item, S.SerialNum, S.ReceiveDate, WW.MinSalesDate
FROM SALES S
INNER JOIN
(
SELECT W.Item, W.SerialNum, MIN(W.SalesDate) MinSalesDate
FROM WARRANTY W
WHERE yourFilter here
GROUP BY Item, SerialNum
) WW
ON S.Item = WW.Item
AND S.SerialNum = WW.SerialNum

Using an Inner join select statement

Add extra table into existing query: guess 1

select *
from atable a
inner join btable b on a.somecol = b.somecol
inner join extra_table t on a.somecol = t.somecol and b.somecol = t.somecol2

Add existing query to a table, method 1

select *
from extra_table t
inner join (
your existing query here
) d on t.somecol = d.somecol

Add existing query to a table, method 2

select *
from (
your existing query here
) d
inner join extra_table t on d.somecol = t.somecol

SQL query for Inner Join with Select

I think it was abount missing 'as fp' after subselect. Try this query:

SELECT 
f.feature_id,
f.feature_name
FROM tbl_feature f
LEFT JOIN (SELECT * FROM tbl_feature_and_profile fp WHERE fp.profile_id= ? )
as fp ON (f.feature_id = fp.feature_id AND f.package_id = fp.package_id)
WHERE
fp.feature_id IS NULL AND f.package_id = ? ORDER BY f.feature_id

JOIN two SELECT statement results

SELECT t1.ks, t1.[# Tasks], COALESCE(t2.[# Late], 0) AS [# Late]
FROM
(SELECT ks, COUNT(*) AS '# Tasks' FROM Table GROUP BY ks) t1
LEFT JOIN
(SELECT ks, COUNT(*) AS '# Late' FROM Table WHERE Age > Palt GROUP BY ks) t2
ON (t1.ks = t2.ks);

Inner Join on Two Select Statements SQL

assuming your schema is:

user_grades
username: varchar(255)
grade: int

Then I would do this query

SELECT 
user_grades.username,
round(grades_above.total / user_grades.total,2) percent_above
FROM (
SELECT username, count(*) total FROM user_grades GROUP BY 1
) user_grades
INNER JOIN (SELECT username, count(*) total FROM user_grades WHERE grade > 75
GROUP BY 1) grades_above ON user_grades.username = grades_above.username

There is probably more than one way to do it but that's done with two select statements and an inner join. I think the example results are wrong but here's what I would expect to see.

username    percent_above
Bob 1.00
Joe 0.67
Sam 0.50

But just make sure you understand what's going on and let me know if you have any questions. It's more important you understand how to get the answer than the answer itself.

SQL: How to Join 2 SELECT statements

you cannot use order by in subquery. You can edit your query. Try this.

select 
t1.AutoNumber
, t1.last_autonumber
, t1.ContactID
, t2.KeyValue_String
from (
select
la.autonumber
, last_autonumber = lag(la.autonumber, 1) over (
partition by la.ContactID
order by la.issuedate asc
)
, la.ContactID
from loanagreements la
--order by la.ContactID desc, la.issuedate asc
) as t1
left join (
select
la.autonumber
, es.KeyValue_String
from loanagreements la
inner join Enum.LoanStatuses es
on la.LoanStatus = es.KeyValue_Int
) as t2
on t1.last_autonumber = t2.autonumber

Inner join with two SELECT queries

Presumably, you want the FX rate for the corresponding date, so the join key should be date, not index:

SELECT fp.*, fx.*
FROM `ibm-project-326221.IBM_project.farm_prices` fp JOIN
`ibm-project-326221.IBM_project.MONTHLY_FX` fx
ON fp.date = fx.date
WHERE fp.cropType = 'Canola' AND
fp.GEO = 'Saskatchewan' AND
fp.date >= '2020-07-01'


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