Referencing function value inside CASE..WHEN - Mailing list pgsql-general

From lover boi
Subject Referencing function value inside CASE..WHEN
Date
Msg-id BLU155-w631200AACFD868D8AA4A68D56F0@phx.gbl
Whole thread Raw
Responses Re: Referencing function value inside CASE..WHEN  ("F. BROUARD / SQLpro" <sqlpro@club-internet.fr>)
List pgsql-general
Hi,

In the following statement, does the custom function get executed twice?

SELECT
  MY_FUNCTION(...),
  CASE WHEN MY_FUNCTION(...) = '...' THEN '...' ELSE '...' END
...
...


If so, is there a way I can make it execute once?  I tried this but it gave me a "Column my_function does not exist" error.

SELECT
  MY_FUNCTION(...) AS my_function,
  CASE WHEN my_function = '...' THEN '...' ELSE '...' END
...
...


Thank you in advance.

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