oracle - Rewrite NOT IN, but subquery involves a comma seperated string (ID) -


changing oracle stored procedure using sql developer.

input: comma separated ids. (example: 'p23,p37,p39,p45') edit: please note input string, not array of string. string more 4 ids. go 200.

want find out table not have input ids.

the following slow. 300 rows of data (in table) takes 20 seconds. want rewrite. please give me hints on how do.

id_array 'p23,p37,p39,p45'.

select * studentinfo studentclass = 'primary5a' , studentid not in (     select regexp_substr(id_array, '[^,]+', 1, level) studentid     dual     connect regexp_substr(id_array, '[^,]+', 1, level) not null    ) , height <= 150;

some of may know already. following

    select regexp_substr(id_array, '[^,]+', 1, level) studentid     dual     connect regexp_substr(id_array, '[^,]+', 1, level) not null

will turn id_array table (table-like structure?) 4 rows:

+-----+ | p23 | | p37 | | p39 | | p45 | +-----+

your id_array must lot longer example here. performance 'p23,p37,p39,p45'.

with longer strings, regexp_substr can pretty slow. i'd suggest using like instead whenever possible, if gets weird. try one.

select * studentinfo studentclass = 'primary5a' , ','||id_array||',' not '%,'||studentid||',%' , height <= 150;

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