SQL查询删除表中的相关记录

Question

I have a simple table with basic sales info like NAME, PRICE, STATUS. for each customer interaction they are input into the table with NAME and PRICE. if that customer has cancelled the deal then another record is added with the NAME, negative PRICE, and STATUS = cancelled. Here is an example table

+------+--------+-----------+
| NAME | PRICE  |  STATUS   |
+------+--------+-----------+
| bob  |    100 |           |
| mary |    100 |           |
| mary |   -100 | cancelled |
| andy |    250 |           |
| mary |    250 |           |
+------+--------+-----------+

What I want to do is remove both the positive and negative records for deals that have cancelled so that the resulting table would look like this.

+------+--------+-----------+
| NAME | PRICE  |  STATUS   |
+------+--------+-----------+
| bob  |    100 |           |
| andy |    250 |           |
| mary |    250 |           |
+------+--------+-----------+

Any suggestions on how to do this in SQL?

Answer 1

Join the table with itself to match the related records:

DELETE t1
FROM yourTable AS t1
JOIN yourTable AS t2 ON t1.name = t2.name AND t1.price IN (t2.price, -t2.price)
WHERE t2.status = 'canceled'

The join finds rows that have the same name, and the price is either the same price or the negative of the price. The WHERE clause restricts this to matching rows that are canceled.

DEMO