Here is what I have and it does not work. It tries to join on size, if not... it join on if it's equal to '*'
INNER JOIN tbl_items ON (
tbl_items.size = COALESCE(tbl_model.size,'*')
AND tbl_items.type = COALESCE(tbl_model.type,'*')
AND tbl_items.category = COALESCE(tbl_model.category,'*')
AND tbl_items.service = tbl_testTypes.name
)
To join on either the exact column match or an alternative string, you could use a pattern like
(tbl_items.size = tbl_model.size) OR (tbl_model.size = '*')
If it matches, the left side of OR is executed, otherwise the right side is used. Group each inside a ().
So fleshing out your entire JOIN:
INNER JOIN tbl_items ON (
((tbl_items.size = tbl_model.size) OR tbl_model.size = '*')
AND ((tbl_items.type = tbl_model.type) OR tbl_model.type = '*')
AND ((tbl_items.category = tbl_model.category) OR tbl_model.category = '*')
AND (tbl_items.service = tbl_testTypes.name)
)
Related
I am using InnoDB. From this question, I found out that I have to specify the length if I want to add index to columns which type is TEXT.
But after successfully adding index, the performance for the select query stay the same. Anyone know why? I did check the index with show index from tableName and the index did exist.
So it was the last two table EventResultsFinalSummary and EventResultsPrelims.
CREATE OR REPLACE VIEW ScheduleView AS
SELECT s.ScheduleID, e.EventRound, e.EventRoundsID, e.EventID, e.NumberCouplesInRound, n.NumberOnBack, eic.EventName AS 'Division',
CONCAT(a1.FirstName, ' ', a1.LastName, ' - ', a2.FirstName, ' ', a2.LastName) AS 'Couple',
s.SessionID AS 'Session', erfs.CouplePlace, c.CoupleID,
s.Timeslot, s.SubFloor ,s.itemDuration,s.HeatNumber, o.ActivityName, st.StudioName AS 'DanceStudio', a.AgeName AS 'Age', s.competition_id, erp.CoupleVotes
FROM Schedule AS s
LEFT JOIN EventRounds AS e ON s.EventRoundID = e.EventRoundsID AND s.competition_id = e.competition_id
LEFT JOIN OtherActivities AS o ON s.OtherActivitiesID = o.OtherActivitiesID AND s.competition_id = o.competition_id
LEFT JOIN EntriesEvents AS ee ON e.EventID = ee.EventID AND e.EventRound <= ee.EventRound AND e.Competition_id = ee.Competition_id
LEFT JOIN Couples AS c ON ee.EntryID = c.CoupleID AND ee.Competition_id = c.Competition_id
LEFT JOIN NumSysComps AS n ON c.CompetitorIDMan = n.CompetitorIDMan AND c.Competition_id = n.Competition_id
LEFT JOIN Attendees AS a1 ON c.CompetitorIDMan = a1.AttendeeID AND c.Competition_id = a1.Competition_id
LEFT JOIN Attendees AS a2 ON c.CompetitorIDLady = a2.AttendeeID AND c.Competition_id = a2.Competition_id
LEFT JOIN Studios AS st ON a1.StudioID = st.StudioID AND a1.Competition_id = st.Competition_id
LEFT JOIN EventsInComp AS eic ON eic.EventID = e.EventID AND eic.Competition_id = e.Competition_id
LEFT JOIN ProAmSingleDanceEvents AS psd ON eic.ProAmSingleDanceEventID = psd.ProAmSingleDanceEventID AND eic.Competition_id = psd.Competition_id
LEFT JOIN ProAmMultiDanceEvents AS pmd ON eic.ProAmMultiDanceEventID = pmd.ProAmMultiDanceEventID AND eic.Competition_id = pmd.Competition_id
LEFT JOIN Ages AS a ON (
psd.AgeID = a.AgeID AND psd.Competition_id = a.Competition_id
OR
pmd.AgeID = a.AgeID AND pmd.Competition_id = a.Competition_id
)
LEFT JOIN EventResultsFinalSummary AS erfs ON e.EventID = erfs.EventID AND c.CoupleID = erfs.CoupleID AND s.Competition_id = erfs.Competition_id
LEFT JOIN EventResultsPrelims AS erp ON e.EventID = erp.EventID AND erp.EventRound = e.EventRound AND c.CoupleID = erp.CoupleID AND s.Competition_id = erp.Competition_id
ORDER BY s.ScheduleID;
I added index to the column that I joined.
EventID, CoupleId, Competition_id for EventResultsFinalSummary and EventID, EventRound, Competition_id for EventResultsPrelims by using query like following.
My question is that when those columns have type like varchar or int, the select * query will only take 1s. But it take 26s when the type is Text.
ALTER TABLE `EventResultsPrelims` ADD INDEX(`EventID`(6));
I wish to call my function (dbo.Split) with a column table (U.UbicacionF) but it doesn't work! Please can u help me!! Thanks
SELECT
EE.IDEstatus, EE.IDAsignacion,EE.IDUNIDAD,
EE.IDEQUIPO,EE.ESTATUS,EE.bUltEstatus,
A.IDDestino, U.UbicacionF, TI.Tiempo
FROM
mar_EstatusEquipo EE
LEFT JOIN
mar_Asignaciones A ON EE.IDAsignacion = A.IDAsignacion
AND EE.IDUNIDAD = A.IDUNIDAD
LEFT JOIN
mar_TmpUbicaciones U ON EE.IDUNIDAD = U.IdUnidad AND U.IdUnidad = A.IDUNIDAD
LEFT JOIN
mar_TiemposArriboPto TI ON A.IDDestino = TI.Destino
AND TI.Ubicacion LIKE '%' + (SELECT *
FROM dbo.Split(U.UbicacionF, ',', '1')) + '%'
WHERE
EE.IDEquipo = CAST(EE.IDUNIDAD AS CHAR)
AND EE.Estatus IN ('IT','ET')
AND A.IDDestino = 'MZO'
AND EE.bUltEstatus = 1
AND EE.IDUNIDAD = 255
ORDER BY
EE.IDUNIDAD
You could use an APPLY operator to pass a column to a table-valued function like that. In your case it would rather be OUTER APPLY than CROSS APPLY, to match your current outer join logic:
SELECT
EE.IDEstatus, EE.IDAsignacion,EE.IDUNIDAD,
EE.IDEQUIPO,EE.ESTATUS,EE.bUltEstatus,
A.IDDestino, U.UbicacionF, TI.Tiempo
FROM
dbo.mar_EstatusEquipo EE
LEFT JOIN
dbo.mar_Asignaciones A ON EE.IDAsignacion = A.IDAsignacion
AND EE.IDUNIDAD = A.IDUNIDAD
LEFT JOIN
dbo.mar_TmpUbicaciones U ON EE.IDUNIDAD = U.IdUnidad AND U.IdUnidad = A.IDUNIDAD
OUTER APPLY (
SELECT t.Tiempo
FROM
dbo.mar_TiemposArriboPto AS t
INNER JOIN
dbo.Split(U.UbicacionF, ',', '1') AS s ON t.Ubicacion LIKE '%' + s.Value + '%'
) AS TI
WHERE
EE.IDEquipo = CAST(EE.IDUNIDAD AS CHAR)
AND EE.Estatus IN ('IT','ET')
AND A.IDDestino = 'MZO'
AND EE.bUltEstatus = 1
AND EE.IDUNIDAD = 255
ORDER BY
EE.IDUNIDAD
;
I need to do a LEFT JOIN with IF/ELSE, this is my query:
IF (M.idArtVar=null,
LEFT JOIN ArtMaga G
ON (G.idMagazzino = V.idMagazzino AND G.idArticolo = M.idArticolo),
LEFT JOIN ArtMaga G
ON (G.idMagazzino = V.idMagazzino AND G.idArticolo = M.idArticolo AND
G.idArtVar = M.idArtVar)
)
But it doesn't work.
I also tried like this:
LEFT JOIN ArtMaga AM
ON IF(M.idArtVar IS NULL,
(AM.idMagazzino = TM.idMagazzino AND AM.idArticolo = A.idArticoli),
(AM.idMagazzino = TM.idMagazzino AND AM.idArtVar = M.idArtVar))
But this query is too slow.
How can I do?
Thanks.
EDIT: This is full query:
SELECT F.Codice AS "CodiceFornitore", F.RagioneSociale AS "RagioneSocialeFornitore", A.ArticoloFornitore, C.Descrizione AS CatDes, S.Descrizione AS Settore, U.Sigla AS Um, U2.Sigla AS Um2, A.Moltiplicatore AS Molt, A.Collo, TM.
dMagazzino, M.idArtVar, AM.Esistenza, AM.Disponibilita, AM.QtaImpegnata, AM.QtaOrdinata, TM.TipoSoggetto, TM.idSoggetto, ST.DataMovimento, MC.Codice, ST.Quantita, ST.Prezzo, ST.Sconti, M.idMagaRigMov
FROM MagaRigMov M
LEFT JOIN Articoli A ON A.idArticoli = M.idArticolo
LEFT JOIN UnMisura U ON U.idUnMisura = A.idUnMisura1
LEFT JOIN UnMisura U2 ON U2.idUnMisura = A.idUnMisura2
LEFT JOIN Iva I ON I.idIva = A.idIva
LEFT JOIN Settori S ON S.idSettori = A.idSettore
LEFT JOIN Fornitori F ON F.idFornitori = A.idFornitore
LEFT JOIN ArtCategorie C ON C.idArtCategorie = A.idArtCategoria
LEFT JOIN MagaTesMov TM ON TM.idMagaTesMov = M.idMagaTesMov
LEFT JOIN STORICO ST ON (ST.idSoggetto = TM.idSoggetto AND ST.TipoSoggetto = TM.TipoSoggetto AND ST.idArticolo = M.idArticolo)
LEFT JOIN MagaCausali MC ON MC.idMagaCausali = ST.idMagaCausale
LEFT JOIN ArtMaga AM ON IF(M.idArtVar IS NULL,(AM.idMagazzino = TM.idMagazzino AND AM.idArticolo = A.idArticoli),
(AM.idMagazzino = TM.idMagazzino AND AM.idArtVar = M.idArtVar))
This query is too slow.. but works..
You can't use an IF to make a conditional join. Because IF is not part of the SELECT syntax and even if it was (like CASE expressions) it wouldn't be allowed to be used like this. You can move the logic to the ON statement though:
LEFT JOIN ArtMaga G
ON (G.idMagazzino = V.idMagazzino AND G.idArticolo = M.idArticolo)
AND M.idArtVar IS NULL
OR (G.idMagazzino = V.idMagazzino AND G.idArticolo = M.idArticolo AND
G.idArtVar = M.idArtVar)
AND M.idArtVar IS NOT NULL
which can be simplified to:
LEFT JOIN ArtMaga G
ON (G.idMagazzino = V.idMagazzino AND G.idArticolo = M.idArticolo)
AND (M.idArtVar IS NULL OR G.idArtVar = M.idArtVar)
Also notice that you can't use equality to check if an expression is null.
M.idArtVar = null will never be true because NULL can never be equal to anything (not even to NULL). The way to check if an expression is null is with IS NULL.
Your second query, that words, is using the IF() function of MySQL and seems to be correct (although I see a difference in the code with the first query, the G.idArticolo = M.idArticolo condition has been removed from one part.)
Why a query is slow depends on many factors and using functions on the join conditions can be one of the many. Try the change I suggest above. If it still slow, you'll have to examine the execution plan and the available indexes on the tables.
Just put the condition in the on clause. If is not part of a SQL statement.
SELECT F.Codice AS "CodiceFornitore", F.RagioneSociale AS "RagioneSocialeFornitore",
A.ArticoloFornitore, C.Descrizione AS CatDes, S.Descrizione AS Settore, U.Sigla AS Um, U2.Sigla AS Um2, A.Moltiplicatore AS Molt, A.Collo, TM.
dMagazzino, M.idArtVar, AM.Esistenza, AM.Disponibilita, AM.QtaImpegnata, AM.QtaOrdinata, TM.TipoSoggetto, TM.idSoggetto, ST.DataMovimento, MC.Codice, ST.Quantita, ST.Prezzo, ST.Sconti, M.idMagaRigMov
FROM MagaRigMov M
LEFT JOIN Articoli A ON A.idArticoli = M.idArticolo
LEFT JOIN UnMisura U ON U.idUnMisura = A.idUnMisura1
LEFT JOIN UnMisura U2 ON U2.idUnMisura = A.idUnMisura2
LEFT JOIN Iva I ON I.idIva = A.idIva
LEFT JOIN Settori S ON S.idSettori = A.idSettore
LEFT JOIN Fornitori F ON F.idFornitori = A.idFornitore
LEFT JOIN ArtCategorie C ON C.idArtCategorie = A.idArtCategoria
LEFT JOIN MagaTesMov TM ON TM.idMagaTesMov = M.idMagaTesMov
LEFT JOIN STORICO ST ON (ST.idSoggetto = TM.idSoggetto AND ST.TipoSoggetto = TM.TipoSoggetto AND ST.idArticolo = M.idArticolo)
LEFT JOIN MagaCausali MC ON MC.idMagaCausali = ST.idMagaCausale
LEFT JOIN ArtMaga AM ON (AM.idMagazzino = TM.idMagazzino AND (m.idartVar is NULL and AM.idArtVar = M.idArtVar or AM.idArticolo = A.idArticoli))
The following query selects all workunts where the inputs are "done" (subquery on line 7). This works fine... when there is only one input. How can I change this so that it requires every input to be IN that set returned by the subquery, not just one of the inputs to be present?
SELECT workunits.ID
FROM workunits
LEFT JOIN workunitInputs ON workunits.ID = workunitInputs.workunitID
WHERE workunits.ID NOT IN (SELECT workunitID FROM jobworkunitassoc)
AND (
workunitInputs.inputID IN (
SELECT workunitOutputs.outputID
FROM workunitOutputs
LEFT JOIN workunits ON workunitOutputs.workunitID = workunits.ID
LEFT JOIN jobworkunitassoc ON workunits.ID = jobworkunitassoc.workunitID
LEFT JOIN jobs ON jobworkunitassoc.jobID = jobs.ID
WHERE jobs.done = 1
)
OR workunitInputs.inputID IS NULL
)
GROUP BY workunits.ID
Thanks, Istvan.
Change that clause to:
AND (
workunitInputs.inputID NOT IN (
SELECT workunitOutputs.outputID
FROM workunitOutputs
LEFT JOIN workunits ON workunitOutputs.workunitID = workunits.ID
LEFT JOIN jobworkunitassoc ON workunits.ID = jobworkunitassoc.workunitID
LEFT JOIN jobs ON jobworkunitassoc.jobID = jobs.ID
WHERE jobs.done != 1
)
This is based on the logical tautology: All X in Y === No X in !Y
This query works for me, though it may not be the best solution:
http://pastebin.com/g9qBjQGU
I spent some time trying to get working this SELECT with CASE but I failed... (thank to that I'm using COLASCE() now)
How could I optimize this SELECT by using CASE/IF sentences? Is this a fast way to query from different tables selected by a field?
SELECT a.folderid, a.foldername, a.contenttype, COALESCE(b.descriptor, c.descriptor, d.descriptor, e.descriptor, f.descriptor) as descriptor
FROM t_folders a
LEFT JOIN t_files b
ON a.contenttype = 'file' AND a.contentid = b.fileid
LEFT JOIN t_links c
ON a.contenttype = 'link' AND a.contentid = c.linkid
LEFT JOIN t_extfiles d
ON a.contenttype = 'extfile' AND a.contentid = d.extfileid
LEFT JOIN t_videos e
ON a.contenttype = 'video' AND a.contentid = e.videoid
LEFT JOIN t_exams f
ON a.contenttype = 'exam' AND a.contentid = f.examid
WHERE a.folderid = $folderId
ORDER BY a.folderid DESC
Using case statement will not make the query faster in your case, but since you asked for it, below is how it would look like.
SELECT a.folderid, a.foldername, a.contenttype,
(CASE a.contenttype
WHEN 'file' THEN b.descriptor
WHEN 'link' THEN c.descriptor
WHEN 'extfile' THEN d.descriptor
WHEN 'video' THEN e.descriptor
ELSE f.descriptor
END CASE) AS descriptor
FROM t_folders a
LEFT JOIN t_files b ON a.contenttype = 'file' AND a.contentid = b.fileid
LEFT JOIN t_links c ON a.contenttype = 'link' AND a.contentid = c.linkid
LEFT JOIN t_extfiles d ON a.contenttype = 'extfile' AND a.contentid = d.extfileid
LEFT JOIN t_videos e ON a.contenttype = 'video' AND a.contentid = e.videoid
LEFT JOIN t_exams f ON a.contenttype = 'exam' AND a.contentid = f.examid
WHERE a.folderid = $folderId
ORDER BY a.folderid DESC
If each of the t_files, t_links, etc tables has the folder_id field, I would also try doing a UNION on these tables and then left join the result with t_folders to get the folderid and foldername.
The joins have to be done this way because the come out of different tables. You cannot use CASE to switch which table a query is coming out of: the statement has to be parsed, including its data sources, before there are values to compare.
More to the point, CASE returns values, whereas table names are.. I don't know the technical term.. structural components of the query. It's sort of the same reason you can't select out of table "Cool_Stuff" with:
select * from "Cool_" + "Stuff"
Hope this answers your question!
You may do the following
select master.* , COALESCE(b.descriptor, c.descriptor, d.descriptor, e.descriptor, f.descriptor) as descriptor
from
( SELECT a.folderid, a.foldername, a.contenttype
FROM t_folders a
WHERE a.folderid = $folderId
ORDER BY a.folderid DESC ) master
LEFT JOIN t_files b
ON master.contenttype = 'file' AND master.contentid = b.fileid
LEFT JOIN t_links c
ON master.contenttype = 'link' AND master.contentid = c.linkid
LEFT JOIN t_extfiles d
ON master.contenttype = 'extfile' AND master.contentid = d.extfileid
LEFT JOIN t_videos e
ON master.contenttype = 'video' AND master.contentid = e.videoid
LEFT JOIN t_exams f
ON master.contenttype = 'exam' AND master.contentid = f.examid
While minimizing the result on table a, the joins operation can be optmizsed