Konvertera TIMESTAMP skillnad kolumndata till strängformat

När du lägger till eller subtraherar tidsstämplar är resultatet ett intervall , inte en annan tidsstämpel. Du kan använda extract funktion att dra ut komponenterna ur det. Om ditt värde alltid kommer att vara undersekund kan du bara extrahera sekunderna och multiplicera med tusen för att få millisekunderna:

with t as (
  select 1 as msg_guid,
    interval '0 0:0:0.343009' day to second as diff
  from dual
)
select trunc(extract (second from diff) * 1000)
from t;

TRUNC(EXTRACT(SECONDFROMDIFF)*1000)
-----------------------------------
                                343 

Här skulle din riktiga fråga ersätta den dummy CTE som jag använde med en bokstavlig intervall.

Om intervallet kan vara mer än en sekund så skulle du förmodligen vilja få hela värdet i millisekunder, så du måste extrahera alla element och lägga ihop dem, multiplicera var och en baserat på vad de representerar - så en hel dag skulle vara 86400000 millisekunder etc.; de vanliga elementen skulle komma ut som:

column diff format a25
with t as (
  select 1 as msg_guid,
    systimestamp - trunc(systimestamp) as diff
  from dual
)
select diff,
  extract (day from diff) as dd,
  extract (hour from diff) as hh,
  extract (minute from diff) as mi,
  extract (second from diff) as ss
from t;

DIFF                           DD         HH         MI         SS
---------------------- ---------- ---------- ---------- ----------
0 9:13:26.150627                0          9         13  26.150627 

Och du skulle kombinera dem som:

with t as (
  select 1 as msg_guid,
    systimestamp - trunc(systimestamp) as diff
  from dual
)
select diff,
  trunc(1000 * (
    extract (day from diff) * (60*60*24)
    + extract (hour from diff) * (60*60)
    + extract (minute from diff) * 60
    + extract (second from diff)
  )) as milliseconds
from t;

DIFF                   MILLISECONDS
---------------------- ------------
0 9:13:27.650365           33207650 

Men baserat på din tidigare fråga kanske du vill ha den som en sträng, som separata komponenter:

with t as (
  select 1 as msg_guid,
    systimestamp - trunc(systimestamp) as diff
  from dual
)
select diff,
  extract (day from diff) || ' DAYS '
    || extract (hour from diff) || ' HOURS '
    || extract (minute from diff) || ' MINUTES '
    || trunc(extract (second from diff)) || ' SECONDS '
    || (trunc(extract (second from diff) * 1000)
      - (trunc(extract (second from diff)) * 1000)) || ' MILLISECONDS'
    as text
from t;

DIFF                   TEXT                                                   
---------------------- -------------------------------------------------------
0 9:43:38.896007       0 DAYS 9 HOURS 43 MINUTES 38 SECONDS 896 MILLISECONDS

SQL-fiol baserat på dina exempeldata, typ och med tidsberäkningen omvänd så att värdet är positivt.