About 2 weeks ago Oracle published the MySQL 5.7.7-labs-json version which includes a very interesting feature called Generated columns (also know as Virtual or Computed columns). MariaDB has a similar feature as well: Virtual (Computed) Columns. The idea is very simple: if we store a column [crayon-55453caee732e787852943/] in our table we may want to filter or group [&]

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https://www.percona.com/blog/2015/04/29/generated-virtual-columns-in-mysql-5-7-labs/