mysql - Count number of times, a number appears and update it to a different column -

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i not sure how in mysql, have searched can't seem find solution. , have table so.

id pid occurrence   1  23  blank 2  23  blank 3  44  blank

basically, occurrence should have value of 2, id 1,2 , value of 1 id 3. appreciated. can call count , group by, , number of times each 1 occurance, update column occurrence in right place each pid.

to correct occurrence value can do

select pid, count(*) occurrence your_table group pid

to update table do

update your_table t1 join  (     select pid, count(*) occurrence     your_table     group pid ) t2 on t1.pid = t2.pid set t1.occurrence = t2.occurrence

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