I'm spinning in circles trying to figure out what is likely a very simple SQL structure. My task seems simple - within the same table I need to update 3 related records with data from one master record. The master coordinates are in the record with a class of 'T', and I want to insert that record's coordinates into the rx_latitude/longitude columns of the related records with class code 'R'
The table structure is: callsign, class, tx_latitude, tx_longitude, rx_latitude, rx_longitude. Sample data looks like this:
J877, T, 40.01, -75.01, 0, 0
J877, R, 39.51, -75.21, 0, 0
J877, R, 40.25, -75.41, 0, 0
J877, R, 39.77, -75.61, 0, 0
Within that same table, I want to populate all of the rx_latitude and rx_longitude fields where the class is 'R' with the tx_latitude and tx_longitude coordinates where the class is 'T' and the callsign matches.
I've tried several insert and update statements, but I can only seem to operate on the master record, not the related records. I would appreciate any guidance that you might offer.
You can use UPDATE...FROM statement:
UPDATE theTable
SET
tx_latitude = masterRecord.tx_latitude,
tx_longitude = masterRecord.tx_longitude
FROM
(SELECT tx_latitude,tx_longitude,callsign FROM theTable WHERE class='T') masterRecord
WHERE
class='R' AND callsign = masterRecord.callsign
Updated
Try :
update yourTable t1, yourTable t2 set
t1.tx_latitude = t2.tx_latitude,
t1.tx_longitude = t2.tx_longitude
where t1.class = 'R' and t2.class = 'T' and t1.callsign = t2.callsign
Example
You can use MySQL's update ... join syntax.
It would go something like this:
update yourtable toUpdate
left join yourtable masterRecordTable
on toUpdate.callsign = masterRecordTable.callsign and masterRecordTable.class = 'T'
set toUpdate.rx_latitude = masterRecordTable.tx_latitude,
toUpdate.rx_longitude = masterRecordTable.tx_longitude
where toUpdate.callsign = 'J877' and toUpdate.class = 'R'
See this fiddle for a working example
Related
I have read a bunch of ways that has gotten me this far. But I can't get to the finish line.
I have a table of coupon codes. I want to use one transaction to select the next available code, mark it as used and input the order number. I can get the update and nested select to work, but I cannot figure out how to actually return the coupon code from the select. It just returns 1 row updated.
Here's what I've got:
UPDATE `prcoupon` pr
SET
`pr`.`status` = '1',
`pr`.`invoicenumber` = '09990002'
WHERE
`pr`.`couponCode` = (SELECT
`prcoupon`.`couponcode`
FROM
`prcoupon`
WHERE
`status` = 0
LIMIT 1)
Sample data
What I need returned is: couponCode: SL2T-03A0-JVCY-W2XMXG
If I understand correctly, you can try to use UPDATE ... JOIN with ROW_Nunber windwon function.
UPDATE prcoupon pr
JOIN (
SELECT *,ROW_NUMBER() OVER(ORDER BY couponCode) rn
FROM prcoupon
WHERE status = 0
) t2 ON pr.couponcode = t2.couponcode
SET pr.status = 1,
pr.invoicenumber = '09990002'
WHERE rn = 1
sqlfiddle
I am given a table for a range of option codes, models and availability from someone else. Currently these are updated by hand in the back-end (I know...) and take a whopping 3 months. I want to automate the process, I tried using CASE WHEN but it seems Access cannot handle it. I ran a query that updated based on one clause and it worked fine, see below. Table 1 is in my db, Table 2 is the data I am given translated in to a usable format. It is just a table with 2 columns; option codes and availability (relevant to a specific model)
UPDATE Table1
SET Table1.Availability = 'Y'
WHERE
(
SELECT Table1.Availability
FROM Table1
INNER JOIN Table2
ON Table1.Code = Table2.Code
WHERE Table2.Availability='OPT'
)
This works but would require a new query for every availability type. Below is my attempt at updating for each availability type. It says there is a syntax error # Switch(...
UPDATE Table1
SET Table1.Availability =
Switch(
Table2.Availability = 'OPT', 'Y',
Table2.Availability = 'STD', 'S',
Table2.Availability = 'DEL', 'N'
)
FROM Table1
INNER JOIN Table2
ON Table1.Code = Table2.Code
WHERE ModelCode = '1234'
;
I'm not sure if I am using switch correctly here, help appreciated. If it isn't clear pretty much what I want is If Table2.Availability = OPT, UPDATE Table1.Availability to 'Y' where Code is the same and Model = specific model
I have to specify a model code as the availability for a given option code (Code) is unique. The data I am given is a mess and it is easiest to sort it in to model specific data.
Thanks in advance :)
Consider the following tested and working syntax:
UPDATE Table1
INNER JOIN Table2
ON Table1.Code = Table2.Code
SET Table1.Availability =
Switch(
Table2.Availability = 'OPT', 'Y',
Table2.Availability = 'STD', 'S',
Table2.Availability = 'DEL', 'N'
)
WHERE ModelCode = '1234'
;
I have a system that collects data from production reports (CSV files) and puts them into a mySql DB.
I have an header table, that contain the production data of sequential report with same setting, and a table with the single reports, connected to the first one (trfCamRep.hdrId -> trfCamHdr.id).
I have a query to calculate the total report, the dubt and the faulty, and the maxTs. These datas are used in the visualizator.
The query is too slow, it requires 9sec.
Can you help me to speed up it?
SET #maxId:=(SELECT MAX(id) FROM trfCamHdr WHERE srcCod='7');
UPDATE trfCamHdr AS hdr
LEFT JOIN (SELECT hdrF.id,COUNT(*) AS nTot,
SUM(IF(res=1,1,0)) AS nWrn,SUM(IF(res=2,1,0)) AS nKO,
MAX(ts) AS maxTS
FROM trfCamHdr AS hdrF
JOIN trfCamRep AS repF ON repF.hdrId=hdrF.id
WHERE clcEnd=0 AND srcCod='7'
GROUP BY hdrF.id) AS valT ON valT.id=hdr.id
SET hdr.clcEnd=IF(hdr.id<#maxId,1,0),
hdr.nTot=valT.nTot,
hdr.nWrn=valT.nWrn,
hdr.nKO=valT.nKO,
hdr.maxTS=valT.maxTS
WHERE hdr.id>=0 AND hdr.clcEnd=0 AND hdr.srcCod='7';
Note trfCamHdr has these columns:
id (primary key)
clcEnd : flag of end calculation (the last remain to 0 because in progress)
nTot : elements with this header
nWrn : elements with res = 1
nKO : elements with res = 2
maxTs : TS of the last element
trfCamRep has these columns:
hdrId (refer to id of trfCamHdr)
res : 0 good, 1 dubt, 2 fault
ts : report timestamp
I'd take this out:
SET #maxId:=(SELECT MAX(id) FROM trfCamHdr WHERE srcCod='7');
And any allusions to the MaxId variable, I believe it to be redundant.
Everything you do will be lower than the max id, and it will take time to calculate if its a big table. You are already checking for srcCod = 7, so it isn't necessary.
In fact, it would miss the update on the one with the actual max id, which is not what I believe you want.
Your left join will also update all other rows in the table with NULL, is that what you want? You could switch that to an inner join, and if your rows are already null, they will just get left alone, rather than getting updated with NULL again.
Then you could just switch out this:
SET
hdr.clcEnd = IF(hdr.id < #maxId, 1, 0),
To
SET
hdr.clcEnd = 1,
Here is the rewritten thing, as always, back your data up before trying:
UPDATE trfCamHdr AS hdr
INNER JOIN
(SELECT
hdrF.id,
COUNT(*) AS nTot,
SUM(IF(res = 1, 1, 0)) AS nWrn,
SUM(IF(res = 2, 1, 0)) AS nKO,
MAX(ts) AS maxTS
FROM
trfCamHdr AS hdrF
JOIN trfCamRep AS repF ON repF.hdrId = hdrF.id
WHERE
clcEnd = 0 AND srcCod = '7'
GROUP BY hdrF.id) AS valT ON valT.id = hdr.id
SET
hdr.clcEnd = 1,
hdr.nTot = valT.nTot,
hdr.nWrn = valT.nWrn,
hdr.nKO = valT.nKO,
hdr.maxTS = valT.maxTS
WHERE
hdr.id >= 0 AND hdr.clcEnd = 0
AND hdr.srcCod = '7';
I found the solution: I created a KEY on hdrId column and now the query requires 0.062s.
Can someone tell me why this insert is failing but not giving me an error either? How do I fix this?
merge table1 as T1
using(select p.1,p.2,p.3,p.4,p.5 from #parameters p
inner join table1 t2
on p.1 = t2.1
and p.2 = t2.2
and p.3 = t2.3
and p.4 = t2.4) as SRC on SRC.2 = T1.2
when not matched then insert (p.1,p.2,p.3,p.4,p.5)
values (SRC.1,SRC.2,SRC.3,SRC.4,SRC.5)
when matched then update set t1.5 = SRC.5;
The T1 table is currently empty so nothing can match. The parameters table does have data in it. I simply need to modify this merge so that it checks all 4 fields before deciding what to do.
You can't select from a variable: from #parameters
See the following post: Using a variable for table name in 'From' clause in SQL Server 2008
Actually, you can use a variable table. Check it out:
MERGE Target_table AS [Target]
USING #parameters AS [Source]
ON (
[Target].col1 = [Source].col1
AND [Target].col2 = [Source].col2
AND [Target].col3 = [Source].col3
AND [Target].col4 = [Source].col4
)
WHEN NOT MATCHED BY TARGET
THEN INSERT (col1,col2,col3,col4,col5)
VALUES (
[Source].col1
,[Source].col2
,[Source].col3
,[Source].col4
,[Source].col5
)
WHEN MATCHED
THEN UPDATE SET [Target].col5 = [Source].col5;
Although there are many questions similar to this, such as
"Updating a record from another table", but i could not get this working.
I have a query that selects and updates table sem_stdexamfinresmark. The select subquery returns multiple rows of data whose size may not be equal to the table being updated, but the update is now working.
The query looks like :
update sem_stdexamfinresmark sr,
(select
se.currsession,
str.studentid,
str.classid,
str.subjectid,
str.aggScore*(select gbtp.percentage from gb_termpercentage gbtp where gbtp.termname = se.examtype)/100 as aggPer,
str.aggGrade
from
sem_stdexamtermresr str,
sem_exam se
where
str.examid=se.examid and
se.examtype = 'Second Term' and
se.currsession =1 and classid='8'
) s
set
sr.SecondTermMark = s.aggPer and
sr.SecondTermGrade = s.aggGrade
where
sr.studentid=s.studentid and
sr.subjectid=s.subjectid and
s.currsession = s.currsession and
sr.classid='8';
EDIT:
update sem_stdexamfinresmark
set
sr.SecondTermMark = s.aggPer and
sr.SecondTermGrade = s.aggGrade
from
(select
se.currsession,
str.studentid,
str.classid,
str.subjectid,
str.aggScore*(select gbtp.percentage from gb_termpercentage gbtp where gbtp.termname = se.examtype)/100 as aggPer,
str.aggGrade
from
sem_stdexamtermresr str,
sem_exam se
where
str.examid=se.examid and
se.examtype = 'Second Term' and
se.currsession = 1 and classid='8'
) s
where
sr.studentid=s.studentid and
sr.subjectid=s.subjectid and
s.currsession =1 and
sr.classid='8';
select * from sem_exam;
update sem_exam set currsession =1;
try something that looks more like:
update foo
set col = bar.col
from bar
where ...
This is what happens when one loses sleep :( I just did a silly mistake here and added "and"