TimeZone conversion


TimeZone conversion

Hi All,

I have a scenario here as below

TAB1 has 100Bn rows with timestamp(RPTG_TS) in 'America Pacific' and need to convert this timestamp column to GMT timestamp.

For now i have timezone shift table( Src_TZ,Tgt_TZ,from_dt,to_dt,shift), TAB1 left join Timezone on (rptg_ts between from_dt and to_dt and Src_Tz='America Pacific'

and Tgt_TZ='GMT'). But this is a inequality join, is there a best way to do this.



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