Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. After I run this query, I get an error message sating invalid use of group function. Any suggestions? Onee problem is obvious -- you have sum statements within sums. I would write this with a correlated subquery:.
How to Write Flexible INSERT and UPDATE Statements in MySQL
MySQL CASE Function
The trigger acts as an accumulator, summing the values inserted into one of the columns of the table. It also includes clauses that specify the trigger action time, the triggering event, and what to do when the trigger activates:. In this case, the trigger activates before each row inserted into the table. The statement following FOR EACH ROW defines the trigger body; that is, the statement to execute each time the trigger activates, which occurs once for each row affected by the triggering event. In the example, the trigger body is a simple SET that accumulates into a user variable the values inserted into the amount column.
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It either inserts, or deletes and inserts. In MySQL 8. Otherwise, it becomes equivalent to INSERT , because there is no index to be used to determine whether a new row duplicates another. You cannot refer to values from the current row and use them in the new row.