The best replacement for case statement is case for support.

The best alternatives to case statement are rated as following:
★★★★★  case for support
★★★  sql
★★★  if statement
★★  decode

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Speaking about case statement, one probably shouldn't forget about select.

Other search terms related to case statement and their ratings are:

★★★★★ select
★★ update
★★ subquery
update in oracle
in clause
group by
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case statement
case for support