Updating data in mysql
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(Bug #11758262, Bug #50439) See Section 184.108.40.206, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.
If you access a column from the table to be updated in an expression, assignments are generally evaluated from left to right.
For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.
The implicit default value is tables for which there are foreign key constraints, the My SQL optimizer might process tables in an order that differs from that of their parent/child relationship.
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You may want to check the following source to find out more about establishing a connection between My SQL and Python.