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The general form of the for statement can be expressed as follows: When using this version of the for statement, keep in mind that: 1  The initialization expression initializes the loop; it's executed once, as the loop begins. 2  When the termination expression evaluates to false, the loop terminates.
MySQL 5.7 Reference Manual / ... / SQL Statement Syntax / MySQL Compound-Statement Syntax / Flow Control Statements / WHILE Syntax. [begin_label:] WHILE search_condition DO statement_list END WHILE [end_label] The statement list within a WHILE statement is repeated as long as the search_condition expression is true.