Updates simple SQL with the key issue of research
Hi, I have two tables TA and TB, where TA contains the fields IDS, FULLNAME, TYPE and tuberculosis contains the fields ID, MIDDLENAMEI want to update the names in TB for first names only according to TA where TB.ID = TA.ID and TA. TYPE = 'ABC '.
I wrote this
setting a day of TB B MIDDLENAME set =
(
Select substr (FULLNAME, instr (FULLNAME, ' ') + 1, instr (FULLNAME, ' ', 1) - length (FIRSTNAME) - 2) of
(
SELECT ID, FULLNAME, substr (FULLNAME, 1, instr (FULLNAME, ' ')-1) first NAME
Ta
where TYPE = 'ABC '.
) AT
where A.ID = B.ID
)
I want to know if there may be no optimization because this SQL is super slow at the moment.
Server Oracle 11 g is
Thank you!
Maybe (easier to write, you can use the fusion too)
update (select b.middlename existing_middle,
substr(a.fullname,
instr(a.fullname,' ',1,1) + 1,
instr(a.fullname,' ',-1,1) - instr(a.fullname,' ',1,1) - 1
) extracted_middle
from tb b,
ta a
where a.id = b.id
and a.type = 'ABC'
)
set existing_middle = extracted_middle
Have no where clause after update, you update all lines
update TB B
set MIDDLENAME = (select substr(FULLNAME,instr(FULLNAME,' ') + 1,instr(FULLNAME,' ', -1) - length(FIRSTNAME) - 2)
from (select ID,FULLNAME,substr(FULLNAME,1,instr(FULLNAME, ' ') - 1) FIRSTNAME
from TA
where TYPE = 'ABC'
) A
where A.ID = B.ID
)
Concerning
Etbin
Edited by: Etbin on 28.7.2012 10:13
merge into tb b
using (select id,
substr(fullname,
instr(fullname,' ',1,1) + 1,
instr(fullname,' ',-1,1) - instr(fullname,' ',1,1) - 1
) extracted_middle
from ta
where type = 'ABC'
) a
on a.id = b.id
when matched
then update
set b.middlename = a.extracted_middle
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