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If you specify an ON DUPLICATE KEY UPDATE clause and a row to be If column b is also unique, the INSERT is equivalent to this UPDATE statement instead: . Regarding the trick for making LAST_INSERT_ID() well defined for updates:
 5 Jul 2012 As of MySQL 5.6.3, permitted explainable statements for EXPLAIN are SELECT, DELETE, INSERT, REPLACE, and UPDATE. Before MySQL
 The DESCRIBE and EXPLAIN statements are synonyms. . should be, run ANALYZE TABLE to update table statistics, such as cardinality of keys, that can affect
 The EXPLAIN statement provides information about how MySQL executes statements: EXPLAIN works with SELECT , DELETE , INSERT , REPLACE , and UPDATE statements. When EXPLAIN is used with an explainable statement, MySQL displays information from the optimizer about the statement execution plan.
 17 Oct 2013 MySQL 5.6 added support for EXPLAIN INSERT/UPDATE/DELETE. by EXPLAIN is different from execution path taken by the actual query.
 31 Jul 2012 MySQL currently doesn't support this (unlike nearly all other DBMS). I think this will be in 5.6 but I'm not entirely sure. I don't think there is any
 For the single-table syntax, the UPDATE statement updates columns of existing rows in the named table with new values. The SET clause indicates which
 26 Nov 2013 I just tried out EXPLAIN UPDATE in MySQL 5.6 and found unexpected results. This query has no usable index: EXPLAIN UPDATE WHERE
 For the single-table syntax, the UPDATE statement updates columns of existing rows in the named table with new values. The SET clause indicates which
 Oracle supports EXPLAIN PLAN for SELECT, INSERT, UPDATE, DELETE, CREATE TABLE, CREATE INDEX, and ALTER INDEX PARTITIONS ] `statement' where `statement' is any valid MySQL INSERT, REPLACE, UPDATE or DELETE statement.
     
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