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MySQL implementation phase cumulative SQL writing method (code example)
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- 2019-01-15 10:43:055433browse
The content of this article is about the cumulative SQL writing method (code example) in the MySQL implementation phase. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Recently there is a need: to count the balance after daily recharge/consumption. For this need, it is actually very simple. You only need to calculate the balance after each recharge/consumption, and then save it. Just come down. But for this kind of demand, a single sql can handle it, and there is no need to create redundant fields.
The chart showing this scenario may be more straightforward
Required results
Writing method one:
select t.* ,(select sum(price) from t_charge temp where temp.date <p><strong>Writing method two: </strong></p><pre class="brush:php;toolbar:false">select t.*, sum(temp.price) as total_price from t_charge t,t_charge temp where t.date <p class="comments-box-content"></p>
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