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Postby arara » 23/06/2017
And worse yet, it updates the rows that just got inserted, which is certainly not needed. It is far better to do the update first, which sri janardhana krishna song only affect a few rows, then insert the new rows: This is far more efficient, but it still might be very bad. It could lock the tables for a long time with krisshna datasets, and like all two-step processes, it is not transactional. Sri janardhana krishna song non-standard MySQL extensions to make the two-step process more efficient. MySQL allows multiple-table updates, which can be used to mark which rows are duplicates during the UPDATE. The downside to this approach is non-portability to other database platforms. As with the non-standard INSERT IGNORE above, this is probably the fastest method: There are other ways to write this statement, for example using the VALUES function, which can help simplify complex queries by sri janardhana krishna song to the value which sohg have been inserted into the given column: The disadvantage to this approach is lack of portability, of course.