Check out example codes for ""i_am_a_dummy flag" in MySQL". It will help you in understanding the concepts better.

Code Example 1

"i_am_a_dummy flag" in mysql engine refuses to execute any UPDATE or DELETE Statement, if WHERE clause is not present in statement.
Hence it will save user to DELETE or UPDATE table data without WHERE clause.
We can achieve similar functionality with 'safe_updates' option in MySQL.

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