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create a computed SQL column that maintains the running total orders each customer has

原文 2014-03-16 08:22:34 4 2 mysql/ sql/ sql-server/ database/ tsql

I thought about using a trigger or function to solve the problem but I don't really know how to go about coding it. Any help would be much appreciated.

2 answers

did you try to create view? view update every time a new row added or updated. Views serve as query and look like a table.

IMHO you should not persist the running totals, the possibility of the value becoming stale is high, instead you should go the route of View as suggested by @m-farhan. Still if you would want to persist the running total, then Trigger would be the safest bet. The Trigger ideally should fire a SQL query to accumulate the Customer's total and update the Total's column.

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create a computed SQL column that maintains the running total orders each customer has

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2 answers

solution1
0 2014-03-16 08:26:50

solution2
0 2014-03-16 09:54:53

create a computed SQL column that maintains the running total orders each customer has

Question

2 answers

solution1 0 2014-03-16 08:26:50

solution2 0 2014-03-16 09:54:53

solution1
0 2014-03-16 08:26:50

solution2
0 2014-03-16 09:54:53