Decode equivalent in postgres

Question

There is no equivalent to the Oracle's DECODE()'Function In Postgres`. Has anyone written the decode as a Function?

Answer 1

There is an equivalent. It's called a CASE statement.

There are two forms of CASE:

Simple CASE:

CASE search-expression

    WHEN expression [, expression [ ... ]] THEN

      statements

  [ WHEN expression [, expression [ ... ]] THEN

      statements

    ... ]

  [ ELSE

      statements ]

END CASE;

Searched CASE:

 CASE

    WHEN boolean-expression THEN

      statements

  [ WHEN boolean-expression THEN

      statements

    ... ]

  [ ELSE

      statements ]

END CASE;

CASE statements are easier to read; I prefer these over decode() in Oracle. 

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