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It is safe or there is a chance that the columns are update with different time, beacause of the 2 visible calls to now() ?
I don't think that it can be update with different values (I think internaly mysql calls now() just once per row or something similar) , but I'm not an expert, what do you think ?
There may be a requirement where the existing data in a My SQL table needs to be modified. This will modify any field value of any My SQL table.
The following code block has a generic SQL syntax of the UPDATE command to modify the data in the My SQL table − The WHERE clause is very useful when you want to update the selected rows in a table.
My SQL can use either standard or non-standard (non ANSI standard) SQL syntax format to perform cross-table update.
Most text fields can be displayed with something like htmlentities($fieldvalue, ENT_QUOTES).
Only the partitions (or subpartitions) listed are checked for matches, and a row that is not in any of these partitions or subpartitions is not updated, whether it satisfies the clause, are flagged as unsafe for statement-based replication.
(This is because the order in which the rows are updated determines which rows are ignored.) Such statements produce a warning in the error log when using statement-based mode and are written to the binary log using the row-based format when using mode.
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