MySQL :: MySQL 8.4 Reference Manual :: 10 OptimizationOptimizing Subqueries, Derived Tables, View References, and Common Table Expressions Optimizing IN and EXISTS Subquery Predicates with Semijoin and Antijoin Transformations
MySQL :: Generated Columns in MySQL 5.7.5
Generated Columns is a new feature available in the latest lab release. This work is based on a contribution by Andrey Zhakov. Thanks, Andrey! The Optimizer team modified it to follow the current MySQL design, and to lift a number of limitations. The syntax is: <type> [ GENERATED ALWAYS ] AS ( <expression> ) [ VIRTUAL|STORED ] [ UNIQUE [KEY] ] [ [PRIMARY] KEY ] [ NOT NULL ] [ COMMENT
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