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What is duplicate ACK when does it occur? - Stack Overflow A duplicate acknowledgment is sent when a receiver receives out-of-order packets (let say sequence 2-4-3) Upon receiving packet #4 the receiver starts sending duplicate acks so the sender would start the fast-retransmit process
INSERT IGNORE vs INSERT . . . ON DUPLICATE KEY UPDATE ON DUPLICATE KEY UPDATE which implies an unnecessary update at some cost, or INSERT IGNORE implies an invitation for other kinds of failure to slip in unannounced
mysql - update on duplicate key update - Stack Overflow In any case, to do all of this automatically you'd probably have to use a trigger 3rd party edit From the docs INSERT ON DUPLICATE KEY UPDATE Statement In general, you should try to avoid using an ON DUPLICATE KEY UPDATE clause on tables with multiple unique indexes
#1062 - Duplicate entry for key PRIMARY - Stack Overflow what is the primary key on your table? You cannot have duplicate values in a primary key field A primary key can also consist of multiple fields so what fields are in your key?
Why do I get a duplicate key error and what is this unique index 0 When I tried to commit a sql query I ended up with the following message: cannot insert duplicate key row in object [] with unique index ' []$ []$ []$' What does that mean? and what "' []$ []$ []$'" is composed of?
Cannot insert duplicate key row in object with unique index The index IX_oa_AcademicHead_personid is specified as being a unique index, meaning every personid in the table must be unique; there can be no duplicates That "some other table" from which it is a foreign key sounds like a "Person" table In reality, two different academic heads cannot be the same person, hence the unique index