I have two tables: Store and Company. I want to be able to delete a store based on the information of its company.
Initially I tried:
DELETE FROM Store WHERE (SELECT * FROM Company WHERE companyValueA > 5).company_id = store.company_id AND store.wf = 0;
But this isnt working. I was thinking about doing a join of the two and deleting from the join like this:
DELETE FROM (SELECT * FROM Store LEFT JOIN Company ON Store.company_id = Company.company_id) WHERE companyValueA > 5 AND wf = 0;
but that isnt working either. Does anyone know how I can accomplish this?
Just a guess... obviously, make a backup before attempting this!!!
DELETE s
FROM store s
JOIN company c
ON c.company_id = s.company_id
WHERE c.companyValueA > 5
AND s.wf = 0;
You could use the MYSQL's DELETE with JOIN syntax (i haven't used it) or just collect all the store id's to be deleted with subquery if you need a more compatible statement:
DELETE
FROM store
WHERE store_id IN (
SELECT S.store_id
FROM store S, company C
WHERE C.company_id = S.company_id
AND C.companyValueA > 5
AND S.wf = 0
)
Related
I coding web app for my client and have issue with selecting from database raports with newest revisions.
SELECT
raports.*,
r1.*,
users.*,
(SELECT COUNT(*) FROM changes WHERE changes.changes_raports_id = raports.raports_id) as changes,
(SELECT changes.changes_date FROM changes WHERE changes.changes_raports_id = raports.raports_id ORDER BY changes.changes_date DESC LIMIT 1) as last_change,
(SUM(injuries.injuries_min_procent) / COUNT(injuries_to_raports.injuries_to_raports_id)) as min,
(SUM(injuries.injuries_max_procent) / COUNT(injuries_to_raports.injuries_to_raports_id)) as max
FROM raports
LEFT JOIN users
ON users.users_id = raports.raports_users_id
LEFT JOIN changes
ON changes.changes_raports_id = raports.raports_id
LEFT JOIN raports_to_changes r1
ON r1.raports_to_changes_raports_id = raports.raports_id
LEFT JOIN injuries_to_raports
ON injuries_to_raports.injuries_to_raports_raports_id = r1.raports_to_changes_raports_id
LEFT JOIN injuries
ON injuries_to_raports.injuries_to_raports_injuries_id = injuries.injuries_id
WHERE r1.raports_to_changes_changes_id = (SELECT max(raports_to_changes_changes_id) FROM raports_to_changes r2 WHERE r2.raports_to_changes_raports_id = r1.raports_to_changes_raports_id)
GROUP BY raports.raports_id ORDER BY raports.raports_id ASC;
In columns max and min i have not correct average from injuries. When i checked it and count all injuries i had 36 when true number is 2 but i have 18 revisions. So is logic that i have looped COUNT with all revisions but i want only the newest
I try changing WHERE statements and more LEFT JOINs but nothing helped.
Could someone fixed that code?
Thank you in advanced
Based on the clues revealed by your queries, the data model may look like this:
The select list shows that you need:
users information of a reports_id
aggregated injuries_min_procent and injuries_max_procent at raports_id level. (see cte_raport_injuries)
number of changes of a raports_id (see cte_raport_changes)
the last change_date of a raports_id (see cte_raport_changes)
I'm not sure about the need for raports_of_changes based on information revealed in the question, so I'm going to ignore it for now.
with cte_raport_injuries as (
select r.raports_id,
sum(i.injuries_min_procent) / count(*) as injuries_min_procent,
sum(i.injuries_max_procent) / count(*) as injuries_max_procent
from raports r
join injuries_to_raports ir
on r.raports_id = ir.injuries_to_raports_raports_id
join injuries i
on ir.injuries_to_raports_injuries_id = i.injuries_id
group by r.raports_id),
cte_raport_changes as (
select r.raports_id,
count(c.changes_id) as changes,
max(c.changes_date) as last_change
from raports r
join changes c
on r.raports_id = c.changes_raports_id
group by r.raports_id)
select u.users_id,
r.raports_id,
ri.injuries_min_procent,
ri.injuries_max_procent,
rc.changes,
rc.last_change
from raports r
join users u
on r.raports_users_id = u.users_id
join cte_raport_injuries ri
on r.raports_id = ri.raports_id
join cte_raport_changes rc
on r.raports_id = rc.raports_id;
The result looks like this:
users_id|raports_id|injuries_min_procent|injuries_max_procent|changes|last_change|
--------+----------+--------------------+--------------------+-------+-----------+
1| 11| 15.0000| 25.0000| 2| 2022-12-02|
So my question for you is what's in reports_to_changes that you need and what's its relationship between others? For further involvement from the community, you may want to share the following information in text format:
DDLs of each tables (primary key, foreign key, column names & data types)
Some representable sample data and basic business rules
Expected output
DELETE *
FROM ((disease
INNER JOIN dishead ON disease.heading = dishead.hid)
INNER JOIN disdes ON disease.description = disdes.did)
where disease.id = 9;
basically i have inserted the data using inner join and the data is stored against same product in multiple tables
Now i am trying to write query for deleting that inserted rows from all tables
You have to specify the tables to delete from
DELETE d, dh, dd
FROM disease AS d
JOIN dishead AS dh ON d.heading = dh.hid
JOIN disdes AS dd ON d.description = dd.did
WHERE d.id = 9
Note also that if these are foreign keys, you can configure them with ON DELETE CASCADE. Then you only have to delete from the parent table, and the rows that reference them will be deleted automatically.
I have 3 tables
For instance
Salestable
-ID
-variableB
-customerUUID
-variableC
Customertable
-customerUUID
-contractUUID
Contracttable
-contractUUID
-variableD
So I am currently doing a SQL Query on salestable
Like:
SELECT DISTINCT variableB FROM Salestable WHERE variableD = "blah";
How can I do this? Where I can find the contract associated with the current salestable?
A bit more info
They are all a 1:1 relationship - so Contracttable is tied to 1 Customertable which is tied to 1 salestable
There is a LOT of data in my database thousands of entries - this query does not run constantly but does need to run somewhat efficent.
SELECT a.*
FROM SalesTable a
INNER JOIN CustomerTable b
ON a.customerUUID = b.customerUUID
INNER JOIN Contracttable c
ON b.contractUUID = c.contractUUID
WHERE c.variableD = 'valueHere'
To further gain more knowledge about joins, kindly visit the link below:
Visual Representation of SQL Joins
If you sure the contract exists use this (othewise swap INNER FOR LEFT):
SELECT variableB, variableD
FROM Salestable t1
INNER JOIN Customertable t2 ON (t1.customerUUID = t2.customerUUID)
INNER JOIN Contracttable t3 ON (t3.contractUUID = t2.contractUUID)
WHERE variableD = "blah"
GROUP BY t1.variableB
I am trying to just select data from table agency where that agency has entry in the commission table with a certain carrier. My SQL query is returning all entries and 3 times. What am I doing wrong.
$allquery = mysql_query("SELECT agency.ID, agency.agencyname, agency.contdate, agency.physcity FROM agency LEFT JOIN commission ON commission.repnum = agency.repid WHERE agency.repid = '$repid' AND commission.repnum = '$repid' AND commission.carrier = 'Carrier' ")or die(mysql_error())
You are not joining two tables unless you actually specify a join criteria involving columns from each table.
SELECT agency.ID, agency.agencyname, agency.contdate, agency.physcity
FROM agency LEFT JOIN commission ON commision.repid = agency.repid AND commission.carrier = 'Carrier'
Q: Why don't you use an inner join if you want to refer to elements in "commission"?
Q: Why are you doing a join at all??? I don't see how "commission" is linked to "agency". Does "commission" have a "repid" field, too?
Anyway, based on what you've shown, I'd recommend this:
SELECT ID, agencyname, contdate, physcity
FROM agency
where repid = '$repid'
I have three tables that looks something like this:
Table joins
|ID|JOIN_NAME|
1 persons
2 companies
Table information
|ID|JOIN_ID|
1 1
2 2
Table information_extra_persons
|ID|INFORMATION_ID|NAME|
1 1 John
Table information_extra_companies
|ID|INFORMATION_ID|NAME|
1 2 IBM
How can i join together these tables in one SQL? I've tried something like:
SELECT * FROM `information`
INNER JOIN `information_extra_(SELECT `name` FROM `joins` WHERE `id` = `join_id`)`
ON `information_extra_(SELECT `name` FROM `joins` WHERE `id` = `join_id`)`.`information_id` = `information`.`id`
but I can't get it to work. Of course this isn't my actual table setup, but it's the same principle. Does anyone know how to get all the info in just one SQL?
That's actually four tables, not three. This isn't just a nitpick - it looks as though the substance of your question is "how can I use the name of the table as part of the join criteria?" (ie. how can the information_extra_ tables be treated as a single table?)
To which the answer is: you can't. (Outside of dynamic SQL.)
In this specific case, the following should return what I think you are looking for:
select j.join_name joined_entity,
case when j.join_name = 'persons' then p.name
else c.name
end joined_entity_name
from information i
inner join joins j on i.join_id = j.id
left join information_extra_persons p on i.id = p.information_id
left join information_extra_companies c on i.id = c.information_id
Alternatively, a less efficient (but more general) approach might be:
select j.join_name joined_entity,
v.name joined_entity_name
from information i
inner join joins j on i.join_id = j.id
inner join (select 'persons' entity, information_id, name from information_extra_persons
union all
select 'companies' entity, information_id, name from information_extra_companies) v
on i.id = v.information_id and j.join_name = v.entity