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'
Related Topics
Query Records and Group by a Block of Time
How to Migrate Datetime Values to Datetimeoffset in SQL Server
Postgres: What Is the Query 'Select * from User' Actually Doing
How to Insert Values into the Database Table Using Vba in Ms Access
Disable SQL Cache Temporary in Rails
Performance Value of Comb Guids
T-SQL Select Get All Months Within a Range of Years
Oracle SQL: the Insert Query with Regexp_Substr Expression Is Very Long ( Split String )
Always Show Decimal Places in SQL
How to Remove Duplicates from Table Using SQL Query
SQL Server - Does Trigger Affects @@Rowcount
SQL Server Group by Query Select First Row Each Group