The best replacement for oracle sql is mysql.

The best alternatives to oracle sql are rated as following:
★★★★★  mysql
★★★  sql server
★★  db2 sql
★★  microsoft sql
★★  t-sql
★★  ms sql
★★  and precedence
★★  sql
★  ansi sql
★  teradata sql
★  tsql
  postgresql

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Speaking about oracle sql, one probably shouldn't forget about clause.

Other search terms related to oracle sql and their ratings are:
★★★★★ clause
★★ keyword
★★ clause update
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