troubleshooting Question

Best way to add calculated column in an Oracle CREATE TABLE .. SELECT statement

Avatar of Jim Horn
Jim HornFlag for United States of America asked on
Oracle Database
8 Comments1 Solution259 ViewsLast Modified:
(Warning:  SQL Server expert, Oracle N00b)

Hello Oracle experts

I have a requirement to build on the currently-in-production (mocked up) code below, adding a column pov_coh_count and populating it with the sum of columns pov_coh_Aa01 through .._Aa09.

CREATE TABLE TARGET PCTFREE 0 NOLOGGING AS
SELECT Column1, Column2, Column3, ColumnN, 
   case when bitand(coh.cohorts, 2) <> 0 then 1 else 0 end pov_coh_Aa01,
   case when bitand(coh.cohorts, 4) <> 0 then 1 else 0 end pov_coh_Aa02,
   case when bitand(coh.cohorts, 8) <> 0 then 1 else 0 end pov_coh_Aa03,
   case when bitand(coh.cohorts, 16) <> 0 then 1 else 0 end pov_coh_Aa04,
   case when bitand(coh.cohorts, 32) <> 0 then 1 else 0 end pov_coh_Aa05,
   case when bitand(coh.cohorts, 64) <> 0 then 1 else 0 end pov_coh_Aa06,
   case when bitand(coh.cohorts, 128) <> 0 then 1 else 0 end pov_coh_Aa07,
   case when bitand(coh.cohorts, 512) <> 0 then 1 else 0 end pov_coh_Aa08,
   case when bitand(coh.cohorts, 1024) <> 0 then 1 else 0 end pov_coh_Aa09
FROM SomeTable 
LEFT OUTER JOIN SomeOtherTable
LEFT OUTER JOIN YetAnotherTable coh
LEFT OUTER JOIN YouGetTheIdea

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What would you recommend as the best way?  Calculated column in the SELECT, add the column after the above statement and then UPDATE, ...

Thanks.
Jim
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