mysql inner join return null value, - mysql

SELECT `mpeda_fish`.`id`, `mpeda_fish`.`fish` as analysis, sum(mpeda_fishdetails.quantity) as qty
FROM (`mpeda_fishdetails`)
INNER JOIN `mpeda_scientificfish` ON `mpeda_scientificfish`.`id` = `mpeda_fishdetails`.`scientificfish`
INNER JOIN `mpeda_fish` ON `mpeda_fish`.`id` = `mpeda_scientificfish`.`fish`
INNER JOIN `mpeda_fishcatch` ON `mpeda_fishcatch`.`id` = `mpeda_fishdetails`.`fishcatch`
INNER JOIN `mpeda_harbour` ON `mpeda_harbour`.`id` = `mpeda_fishcatch`.`harbour`
WHERE `mpeda_fishcatch`.`status` = 1
ORDER BY `mpeda_fishdetails`.`id` ASC
this query gets 2 columns null value and one column gets data inside why?

You use the SUM() function. In order to get meaningful results you should have a group by clause.
SELECT `mpeda_fish`.`id`, `mpeda_fish`.`fish` as analysis, sum(mpeda_fishdetails.quantity) as qty
FROM (`mpeda_fishdetails`)
INNER JOIN `mpeda_scientificfish` ON `mpeda_scientificfish`.`id` = `mpeda_fishdetails`.`scientificfish`
INNER JOIN `mpeda_fish` ON `mpeda_fish`.`id` = `mpeda_scientificfish`.`fish`
INNER JOIN `mpeda_fishcatch` ON `mpeda_fishcatch`.`id` = `mpeda_fishdetails`.`fishcatch`
INNER JOIN `mpeda_harbour` ON `mpeda_harbour`.`id` = `mpeda_fishcatch`.`harbour`
WHERE `mpeda_fishcatch`.`status` = 1
GROUP BY `mpeda_fish`.`id`, `mpeda_fish`.`fish`
ORDER BY `mpeda_fishdetails`.`id` ASC

Related

I am getting a "subquery returning multiple rows" error. I want to return multiple rows however

I want to have a subquery which returns multiple rows in MySQL. I used the IN function as well. However i am getting a "subquery returning multiple rows" error. I have attached an image of the tables used and the desired output
Here is my SQL code:
Select t2.STUID, t3.UnitCmd, //main query
(Select count(*) as 'FullDutyCount' from stormtroopers_officer A1 inner join st_officer_assign A2 ON A1.STID = A2.STID where A2.STUID IN('STU-1','STU-2','STU-3') AND A1.DutyStatus = 'Full Duty' group by A1.Dutystatus,A2.STUID), //subquery1
(Select count(*) as 'WoundedCount' from stormtroopers_officer A1 inner join st_officer_assign A2 ON A1.STID = A2.STID where A2.STUID IN('STU-1','STU-2','STU-3') AND A1.DutyStatus = 'Wounded' group by A1.Dutystatus,A2.STUID),//subquery2
(Select count(*) as 'KilledCount' from stormtroopers_officer A1 inner join st_officer_assign A2 ON A1.STID = A2.STID where A2.STUID IN('STU-1','STU-2','STU-3') AND A1.DutyStatus = 'Killed' group by A1.Dutystatus,A2.STUID) //subquery 3
FROM stormtroopers_officer t1 inner join st_officer_assign t2 ON t1.STID = t2.STID
inner join stormtrooper_unit t3 ON t2.STUID = t3.STUID where t2.STUID IN ('STU-1','STU-2','STU-3') group by t1.Dutystatus,t2.STUID;
You seem to want conditional aggregation:
select
su.stuid,
su.unitCmd unitHQ,
sum(so.dutyStatus = 'Full Duty') fullDutyCount,
sum(so.dutyStatus = 'Wounded' ) woundedCount,
sum(so.dutyStatus = 'Killed' ) killedCount
from st_officier_assign soa
inner join stormtrooper_unit su on su.stuid = soa.stuid
inner join stormtrooper_officer so on so.stid = so.stid
where su.stuid in ('STU-1','STU-2','STU-3')
group by su.stuid, su.unitCmd

Query to get all rows grouped by a field value with a condition on another field

I have following query:
SELECT
a.id_posicion,
a.profesional,
MAX( a.fecha_hora ) AS fechaPosicion,
a.latitud,
a.longitud,
b.tipo_profesional,
b.nombre,
b.apellidos,
c.tipo_profesional as tipoProfesional,
b.profile_image,
b.tel as tel,
e.especialidad as especialidad_profesional,
b.ciudad as ciudad,
b.departamento as departamento,
b.id_firebase as id_firebase
FROM tb_ultima_posicion_pro a
INNER JOIN users b ON b.id = a.profesional
INNER JOIN tb_profesionales c ON c.id_profesionales = b.tipo_profesional
INNER JOIN tb_especialidades_profesional d ON d.profesional = b.id
INNER JOIN tb_especialidades e ON d.especialidad = e.id_especialidad
GROUP BY a.profesional
ORDER BY fechaPosicion DESC
What I need is to get all records from the table tb_ultima_posicion_pro, grouped by the field profesional, which means that I get only a row for each profesional (that is ok), and for each profesional I need to get te row with the newest field fecha_hora, which is a datetime field.
What I am getting with this query is a row for each profesional (ok) but not the one with the newest fecha_hora field value.
Alternatively, You can first fetch the maximum fetch_hora by grouping the table tb_ultima_posicion_pro and then can join other tables -
SELECT a.id_posicion
,a.profesional
,am.fecha_hora AS fechaPosicion
,a.latitud
,a.longitud
,b.tipo_profesional
,b.nombre
,b.apellidos
,c.tipo_profesional as tipoProfesional
,b.profile_image
,b.tel as tel
,e.especialidad as especialidad_profesional
,b.ciudad as ciudad
,b.departamento as departamento
,b.id_firebase as id_firebase
FROM tb_ultima_posicion_pro a
INNER JOIN (SELECT profesional
,MAX(fecha_hora) AS fecha_hora
FROM tb_ultima_posicion_pro
GROUP BY profesional) am ON a.profesional = am.profesional
AND a.fecha_hora = am.fecha_hora
INNER JOIN users b ON b.id = a.profesional
INNER JOIN tb_profesionales c ON c.id_profesionales = b.tipo_profesional
INNER JOIN tb_especialidades_profesional d ON d.profesional = b.id
INNER JOIN tb_especialidades e ON d.especialidad = e.id_especialidad
ORDER BY fechaPosicion DESC

error subquery return more than 1 when doing multiple select

I want to do a multiple select in one query with different conditions. but somehow i'm stuck in this problem. any idea?
SELECT
(select io_link_event_names.name from doors left join controller_devices on doors.iid = controller_devices.iid left join events on controller_devices.mac = events.mac left join io_link_event_names on events.iolinkerid = io_link_event_names.extra where events.iolinkerid = "9000;1") AS forced,
(select doors.name FROM doors) AS doorname
ERROR #1242 - Subquery returns more than 1 row
consider this
SELECT d.[forced], doors.name as doorname
from doors
left join (
select controller_devices.iid, io_link_event_names.name as [forced]
from events
inner join controller_devices on controller_devices.mac = events.mac
inner join io_link_event_names on events.iolinkerid = io_link_event_names.extra
where events.iolinkerid = "9000;1"
) as d on d.iid = doors.iid
If you have more than 1 row in table doors, you get this error. If you want too see door name relevant to event selected in first query, use
select io_link_event_names.name,
doors.name doorname
from doors
left join controller_devices
on doors.iid = controller_devices.iid
left join events
on controller_devices.mac = events.mac
left join io_link_event_names
on events.iolinkerid = io_link_event_names.extra
where events.iolinkerid = "9000;1"

Mysql Fetching rows base on date

Here's the code:
SELECT RD.INTREQDQUANTITY, I.strItemName, v.strVendName, iu.strItemUnitName,
ip.dblItemPAmount, MAX(ip.dtmItemPasOf) AS EXR
FROM TBLREQUESTDETAILS RD,tblitem I,tblvendor v,tblitemunit iu,tblitemprice ip`
WHERE RD.strReqDItemCode = I.strItemCode
AND RD.strReqDItemUnitCode = iu.strItemUnitCode
AND RD.strReqDVendCode = v.strVendCode
AND i.strItemCode = ip.strItemPItemCode
and RD.strReqDReqHCode = 'RQST121'
GROUP BY RD.INTREQDQUANTITY,I.strItemName,v.strVendName,iu.strItemUnitName, ip.dblItemPAmount
ORDER BY EXR desc ;
AND Here's The result:
What should I do If I want to fetch the current price for each itemname,vendorname and itemunit?? I want to fetch only those rows who's price is the Latest... Help me please those with boxes are the rows that i want to fetch
You can use where in the grouped value (and use explicict join notatio)
SELECT RD.INTREQDQUANTITY, I.strItemName, v.strVendName, iu.strItemUnitName,
ip.dblItemPAmount, ip.dtmItemPasOf AS EXR
FROM TBLREQUESTDETAILS RD
INNER JOIN tblitem I ON RD.strReqDItemCode = I.strItemCode
INNER JOIN tblvendor v ON D.strReqDVendCode = v.strVendCode
INNER JOIN tblitemunit iu ON RD.strReqDItemUnitCode = iu.strItemUnitCode
INNER JOIN tblitemprice ip ON i.strItemCode = ip.strItemPItemCode
WHERE RD.strReqDReqHCode = 'RQST121'
and ( RD.INTREQDQUANTITY, I.strItemName, v.strVendName, iu.strItemUnitName, ip.dtmItemPasOf)
in ( SELECT RD.INTREQDQUANTITY, I.strItemName, v.strVendName, iu.strItemUnitName,
MAX(ip.dtmItemPasOf)
FROM TBLREQUESTDETAILS RD
INNER JOIN tblitem I ON RD.strReqDItemCode = I.strItemCode
INNER JOIN tblvendor v ON D.strReqDVendCode = v.strVendCode
INNER JOIN tblitemunit iu ON RD.strReqDItemUnitCode = iu.strItemUnitCode
INNER JOIN tblitemprice ip ON i.strItemCode = ip.strItemPItemCode
WHERE RD.strReqDReqHCode = 'RQST121'
GROUP BY RD.INTREQDQUANTITY,I.strItemName,v.strVendName,iu.strItemUnitName
)
ORDER BY EXR desc ;
(and use explicict join notation .. i think is more readable)

MySQL LIMIT in a Correllated Subquery

I have a correlated subquery that will return a list of quantities, but I need the highest quantity, and only the highest. So I tried to introduce an order by and a LIMIT of 1 to achieve this, but MySQL throws an error stating it doesn't yet support limits in subqueries. Any thoughts on how to work around this?
SELECT Product.Name, ProductOption.Name, a.Qty, a.Price, SheetSize.UpgradeCost,
FinishType.Name, FinishOption.Name, FinishTierPrice.Qty, FinishTierPrice.Price
FROM `Product`
JOIN `ProductOption`
ON Product.idProduct = ProductOption.Product_idProduct
JOIN `ProductOptionTier` AS a
ON a.ProductOption_idProductOption = ProductOption.idProductOption
JOIN `PaperSize`
ON PaperSize.idPaperSize = ProductOption.PaperSize_idPaperSize
JOIN `SheetSize`
ON SheetSize.PaperSize_idPaperSize = PaperSize.idPaperSize
JOIN `FinishOption`
ON FinishOption.Product_idProduct = Product.idProduct
JOIN `FinishType`
ON FinishType.idFinishType = FinishOption.Finishtype_idFinishType
JOIN `FinishTierPrice`
ON FinishTierPrice.FinishOption_idFinishOption = FinishOption.idFinishOption
WHERE Product.idProduct = 1
AND FinishTierPrice.idFinishTierPrice IN (SELECT FinishTierPrice.idFinishTierPrice
FROM `FinishTierPrice`
WHERE FinishTierPrice.Qty <= a.Qty
ORDER BY a.Qty DESC
LIMIT 1)
This is a variation of the greatest-n-per-group problem that comes up frequently.
You want the single row form FinishTierPrice (call it p1), matching the FinishOption and with the greatest Qty, but still less than or equal to the Qty of the ProductOptionTier.
One way to do this is to try to match a second row (p2) from FinishTierPrice that would have the same FinishOption and a greater Qty. If no such row exists (use an outer join and test that it's NULL), then the row found by p1 is the greatest.
SELECT Product.Name, ProductOption.Name, a.Qty, a.Price, SheetSize.UpgradeCost,
FinishType.Name, FinishOption.Name, FinishTierPrice.Qty, FinishTierPrice.Price
FROM `Product`
JOIN `ProductOption`
ON Product.idProduct = ProductOption.Product_idProduct
JOIN `ProductOptionTier` AS a
ON a.ProductOption_idProductOption = ProductOption.idProductOption
JOIN `PaperSize`
ON PaperSize.idPaperSize = ProductOption.PaperSize_idPaperSize
JOIN `SheetSize`
ON SheetSize.PaperSize_idPaperSize = PaperSize.idPaperSize
JOIN `FinishOption`
ON FinishOption.Product_idProduct = Product.idProduct
JOIN `FinishType`
ON FinishType.idFinishType = FinishOption.Finishtype_idFinishType
JOIN `FinishTierPrice` AS p1
ON p1.FinishOption_idFinishOption = FinishOption.idFinishOption
AND p1.Qty <= a.Qty
LEFT OUTER JOIN `FinishTierPrice` AS p2
ON p2.FinishOption_idFinishOption = FinishOption.idFinishOption
AND p2.Qty <= a.Qty AND (p2.Qty > p1.Qty OR p2.Qty = p1.Qty
AND p2.idFinishTierPrice > p1.idFinishTierPrice)
WHERE Product.idProduct = 1
AND p2.idFinishTierPrice IS NULL