db-schema

Commit Graph

Author	SHA1	Message	Date
Rene Krenn	52b3341599	TT#147151 UDFs for fast usage count of billing profile&network mariadb does not support variable referals in correlated subqueries if the nesting depth is 2 or beyond. so in short: below works -> select (select count(*) from table1 where id = root.id ) as cnt from table2 as root; ... while this not unfortunately: select (select count(1) from (select 1 from table1 where id = root.id LIMIT 1001) as q ) as cnt_limited from table2 as root; this can be solved by declaring the topical subqueries in dedicated user-defined functions, so involved panel/api parts will load quickly even with millions of subscribers. Change-Id: If96603cb4115259d719297af46c5bc7c10aadf76	5 years ago

Author

SHA1

Message

Date

Rene Krenn

52b3341599

TT#147151 UDFs for fast usage count of billing profile&network

mariadb does not support variable referals in correlated
subqueries if the nesting depth is 2 or beyond.

so in short: below works ->

select
  (select
     count(*)
   from table1
    where id = root.id
  ) as cnt
from table2 as root;

... while this not unfortunately:

select
  (select
     count(1)
   from (select
           1
         from table1
         where id = root.id
         LIMIT 1001) as q
  ) as cnt_limited
from table2 as root;

this can be solved by declaring the topical subqueries
in dedicated user-defined functions, so involved
panel/api parts will load quickly even with millions of
subscribers.

Change-Id: If96603cb4115259d719297af46c5bc7c10aadf76

1 Commits (00a754e9c7cfd85633f5096bf7898907a39ac673)