mysql - SQL Update table from not exists statement -


still new learning lots.

i have 2 tables avdmaster , avdupdates.

i update current existing row(s) in avdmaster (fields: owner, reg, previous) new data avdupdates (fields: owner, reg, previous) avdupdates reg not exist in avdmaster reg, uniqueid in both tables matches. avdmaster fair size table 860k records.

my select statement seems work, found 4 row(s) update:

select b.uniqueid, b.reg, b.previous  avdupdates b  not exists (select l.reg avdmaster l b.reg = l.reg)

but tried update statement select, , receive #1064 error.

update avdmaster  set l.reg=b.reg, l.owner=b.owner, l.previous=b.previous  (select b.uniqueid, b.reg, bprevious `from avdupdates b not exists (select l.reg avdmaster l b.reg = l.reg))

hopefully 1 of sql gurus can me out update statement, , whether or not not exists best query method?

secondly, interested in similar statement insert rows avdupdates uniqueid not exist in avdmaster.

thanks,

stephen


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